6 PROCEEDINGS OF THE NATIONAL MUSEUM vol.loi. the upper surface of a single specimen, one short and inconspicuous below the longer and often broader scale. It has two pronounced elevations on the anterior margin of the thorax that are elsewhere in the group.
BEETLES OF THE GENUS MYOCHROUS — BLAKE H
The stippling of the chest is extremely fine and in stripes, the stitches not being at all distinct; aedeagus short (southern Texas and New Mexico and regions south of this in Mexico) cyphus, new species Punctation of thorax coarser but still confluent and indistinct. Anterior margin of thorax with a pair of gibboses separated by a deep groove; anterior pair of tibiae with teeth (Brazil).
BEETLES OF THE GENUS MYOCHROUS — BLAKE 13
Descend to antennal sockets covered by scales which completely hide the punctuations, a narrow ridge extending on each side of the occiput, the punctation below the scales in fine lines radiating from a shallow median vertical depression; at the bottom of the front between the antennal sockets shining under the light, white pubescence, the scales here become less dense and more hair-like, each coming from a coarse puncture; holes here not completely sick and make wrinkle. BEETLES OF THE GENUS MYOCHROUS — BLAKE 15with a more hair-like scale from each puncture, the scales on the pro-.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 15 with a more hairlike scale from each puncture, the scales on the pro-
Tucker^^ noted a serious outbreak in Butler County, Kans., which required the replanting of "hundreds of acres of corn." In southern Louisiana and Mississippi, it has been found to damage cotton and. An unusually complete description of the immature stages and life history was given by E.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 17 toothed margin and a tooth at apical and basal corners and a moderate
Prothorax wider than long, conspicuously 3-toothed on lateral margin with tooth having apex and basal angle; disc with median convexity and basal depression along margin, most prominent above scutellum; point moderately coarse and confluent, in longitudinal lines not entirely hidden by yellowish gray scales. Unfortunately, among the four specimens from Arizona, there is no male aedeagi for comparison.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 19
In light of this confusion, I have chosen the type locality as Cordoba, Mexico, in an attempt to fix the species. Prothorax wider than long (contrary to Jacoby's statement), with three lateral teeth and the usual tooth at apex and base; punctuation dense, moderately coarse, tending to be in lines but not grooved; the scales are not flat pressed, but slightly curved.
BEETLES OF THE GENUS MYOCHROUS
The scales are sometimes bifurcated as in the European genus Pachnephorus., and this character together with the edentulous thorax makes this species somewhat intermediate between the two genera. It is one of the most atypical of the species of Myochrous and forms, with the three succeeding species, a small group that is sown.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 23
Elytra with small humeri and a short intrahumeral sulcus, a faint basal callus; the striated punctures not round, but somewhat triangular, often star-shaped and interspersed with finer, shallower punctures, the larger punctures becoming fine and without thickening towards the apex; whitish scales short, fine and not very dense. They are unique among North American species of Myochrous in being inconspicuously scaly, the scales very short and not dense. Head covered by dense, appressed, white scales to antennal sockets, the usual occipital ridges absent, a faint median line and fine longitudinal lines of confluent punctures radiating from these; lower front polished and with coarse holes and some finer hairlike.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 25
Elytra about twice as long as prothorax, broad, convex, with sharp small humerules and no basal callosities, rows of punctures not as close as in Denticolis; scales rather wide and. The legs are short, the scales are rougher than in denticolys, the punctures in the ether are less dense. The head is densely covered with brown and white, closely appressed scales, forming a brown, irregular star pattern on the front, a central depression in front, and a somewhat indistinct ridge.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 27 under the scales densely and moderately coarsely punctate ; lower front
SO longer than wide, with a 3-toothed margin, smoothly convex with a depression along the basal margin, deep, rough, robat and. Prothorax not as long as wide, smoothly convex with a 3-toothed margin and a tooth in each corner; impressed along basal margin; point rough, deep and confluent. The reddish-brown color and yellowish scales distinguish this species from Denticolis and Ranella.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 29
The two specimens in the NationalMuseum's collection from north of New Orleans and Brookhaven may have been imported shipments of fruit to New Orleans. Antennae extending below humeri, reddish brown with darker and thicker distal joints, of the usual proportions. Van Duzee, California Academy of Sciences; 2 paratypes, U.S.N.M. CARS OF THE GENUS MYOCHROUS — BLAKE 33 Type locality.—Coalinga, Fresno County, California, Boy ScoutCamp.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 35
All three species are very similar in external appearance, but this one is usually less densely punctured on the prothorax. Originally described from Barbados, it has been collected on both Grenada and Trinidad as well as on the mainland of the Guianas. This is another species of the femoralis group in which the aedeagus, although having a similarly shaped tip, is shorter.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 37 MYOCHROUS PLATYLONCHUS, new species
The head is covered with scales down to antenna sockets, below these the punctures are coarse and tend to be light streaked; amedian line ending in a shallow depression between the eyes, the usual pair of occipital ridges. Prothorax wider than long, not very convex, with a basal depression along the margin, the three lateral teeth well developed and one tooth atapical and basal angles; punctuation dense, tends to be in short lines, and becomes coarser and rougher towards the bottom. Elytra with a short intrahumeral sulcus and slight transverse lateral depression below the sulcus; striated punctures very dense and coarse and in the basal part the depression with transverse edges; the surface is shiny under the curved, not dense, greyish-white scales.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 39
The head is densely covered with broad scales, even to the base of the jaws, the usual ridges on either side of the nape, the surface under the scales dense and deep, but not coarsely or punctate. The body is densely covered with broad white scales leaving little of the dark shiny undersurface visible. Type and paratypes.- Male type and three paratypes, Museum of Comparative Zoology type No. 28123, collected by P.J.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 43 MYOCHROUS BOLIVIANUS, new species
About 7 mm, in length, broadly oblong, glossy black, covered with light vrhite and brown scales forming a half-white pattern on the elytra; thorax almost as long as wide, extending over head with a thickened anterior margin; strongly convex with a 3-toothed lateral margin; surface rather fine and not very densely punctate; elytra with well-spaced punctation. Body below shiny black with fine white scales, abdomen without scales down the middle, first segment fine and not very densely pointed. BEETLES OF THE GENUS MYOCHROUS — BLAKE 45 more or less distinct teeth; all femora strongly toothed; no teeth on it.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 45 more or less distinct teeth ; all femora strongly toothed ; no tooth on
CARS OF THE GENUS MYOCHROUS — BLAKE 45 more or less distinct teeth; all femora strongly toothed; no teeth on. area between antennae with a few fine white scales; the usual ridge on each side of the nape, in the center of the front; punctures small and well spaced. Unlike curculionoides, this species has a tooth on the inside of the anterior tibia, and the anterior femora are not toothed. There is a similar pale color to the scales at the tip of the elytra, but the scales are much wider than in curculionoides and resemble the scales of M.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 47
Arhentina: Probinsia ti Buenos Aires: Hulio aginggana idi Septiembre 1919 (H. E. Box, C. Burch pay); Delta ti Parana, Carapecha (F. Monros), Galvez (F. Monros), Lujan, Garcia, Punta Lara (F. Monros), Pederal a Kapitolio (F. Monros); Giiemes, Probinsia ti Salta (H. A. Jaynes) ; St. Karayan James, St. (G. E. Bryant, Mayo1912), San. Santiago, . Agpada a nailadawan ti M. hohemani Lefevre ken M. armatus Baly manipud Brazil sumagmamano a tawenen ti napalabas. M. ai^iatus ken ti tipo a M. hoheman {denticollis Boheman) ken. Ti dakkel a kadakkel, ti napuskol unay a punctatethorax, nga agarup kakatlo ti kaatiddog ti kuton, ken ti nangnangruna nga atiddog a napaksuyan a murdong ti aedeagus ti mangilasin iti daytoy a kita.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 49
50 NATIONAXi MUSEUM PROCEEDINGS vol.loi . la punctuation comme celle du pronotum, et serriee, les espaces non . relays; cependant le premier espace lateral est presque en crete aigue surtout pres du callus. Plate 6, FiGtrRE 2 . About 5.5 mm. in length, oblong-oblong, shining black with short pale scales; thorax about as long, not very convex, with 3 teeth, very dense and thick, but not punctate; elytra not much. The aedeagus is similar to that of many North American species, especially the West Indian species, but with a slightly shorter tip.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 53
Body not very densely pubescent below, with broader scales below breast and sides, and finer, longer scales on belly and legs; densely and moderately coarsely punctate. Legs dark reddish brown; fore tibia without the usual visible tooth on the inner side, but a small tooth which is almost hidden in the long shaggy coat, and is situated a little further from the apex than usual, and is difficult to see; posterior femoratoothed; claws unusually long. Protliorax much wider than long, not convex but flattened at sides with depression along base and shallow depression on either side near base; margin varying from nearly arcuate or slightly wavy to distinctly 3-toothed, with a small tooth at apical and basal angle; surface beneath fine, closely appressed yellow scales shining, minutely and not densely punctate, the dots becoming.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 55 coarser and denser toward the base, and interspersed with fine, shallow
RcT Marks.—This is one of the rufous species, distinguished by its sparse punctuation, strongly convex thorax, and short, dense aedeagus.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 57
Type and "paratypes.— Type and one paratype at the MiguelLillo Institute, Tucuman, Argentina, January 3, 1949, collected by Kuschel; one paratype, U.S.N.M. This is one of the reddish-brown species, with a thickened anterior margin on the prothorax concealing the head. Head covered with scales to antennal cavities, below scales an indeterminate median line terminating in middle of front in a shallow depression; coarse, dense, shallow, confluent pits forming a network of irregular lines across entire front, usual occipital ridges on each side.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 61
Prothorax projecting above head and concealing it, overall as long as wide, rather flat with depression behind narrowed and slightly raised front; sides finely 3-toothed with a strong tooth behind the eyes at the parietal angle and a small tooth at the basal angle; surface cloudy, alutaceous, with moderately dense round pits; scales not compressed, but erect in small curved loops over the whole surface, not very dense. Elytra shining beneath brown and white, rather rough and curved scales forming an irregular color pattern; striated puncture dense and moderate-. ReTYiarks.— A spurson on the middle and hind tibia just before the apex distinguishes this species from all others in the genus.
BEETLES OF THE GENUS MYOCHROUS — BLAKE 63 MYOCHROUS CALCARIFERUS, new species
Prothorax cylindrical, as long as wide, with a small apical and basal tooth, but no signs of lateral serration, sides curved; disc without depressions except along the basal margin, smoothly covered by broad, pale scales, the scales in the center a little darker; punctuation underneath apparently quite dense and fine. Elytra wider than prothorax, tapering at the apex, rather convex, with prominent humeri, and covered by broad scales forming a pattern, white along the base and on liumeri, and in the center of each elytron two or two more white spots. and another along the side; rows of striped punctures that are not sufficiently spaced apart, and the punctures are round. The body underneath is more densely covered with narrower and longer scales, especially along the sides of the abdomen, in the center of the abdomen and on the upper side of the lower body, less scaled; first abdominal segment almost half the length of.
