Together with the significant accumulations of new material, this necessitated a revision of the American species. Some of Kolenati's work is difficult to decipher due to the very sparse descriptions and extremely superficial illustrations presented. Fortunately, some of the copies that featured his work were . ])ased still exists in iSt.
South of the United States conditions are quite different, and present an aspect of considerable economic importance, here we are. The exact homologies of the genitalia have yet to be worked out. out, even though Rothschild took a long step in the right direction. This is a matter in which minute accuracy is not only undesirable, but also impracticable, owing to the uneven ends of the joints.
However, there is no authentic record of its occurrence within the borders of the United States. One of the two incidents was likely coincidental, but that has yet to be determined.
SYNOPSIS OF AMEEICAN SPECIES
Nor does he draw the stylet of the female, although the individual shown was of this sex. The relative lengths of the hind tarsal joints are approx. The pro-, meso-, and metanotumha\'e two transverse rows of bristles, those of the anterior rows nuich weaker, the number in each row a])ud 11-16. The male has the lateral part of the ninth tergite large and conical in outline and armed at the apex with three stout close-set spines.
The front notch is completely removed. The gena has only two large heavy spines, one in the center of the medium-sized eye. the othei- near lower. There is a large sclerite in the male lateral part of the ninth tergite, . rounded])oved, with a strong tooth in the posterior upper corner and numerous bristles along the upper margin. In the male, the lateral part of the ninth tergite is expanded in a large, round lol)(\ a]) beyond the apical l)row, in which six to eight large, strong spines are placed.
The toothed upper male is about four times as bioad as long instead of only twice, and the lateral lobe of the ninth tergite is mucii narrower than in If but one or a few specimens were found on the lynx, I should have considered the appearance accidental, and assumed that these specimens were originally from some . rabbit, ])ut Professor Aldrich took a large series. I heartily believed in Mr. Rothschild's much-needed setrreo-ji-tion of the composite species avlurn^ but his similar effort in the case of ca7its and falls cannot. it seems to me, possible. The diU'ercnce inthemales which he indicates would \er}' be few at best; they are principally related to the mmiber and arrangement of the])ristles on the di.scs of the male clamps. This is the largest genus in the order, containing many closely related and very odd forms. 386 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. . displaced toward the midline and directed backward. The distinctive aberrant perpinnatus with a medial pair of spines displaced toward the center then occurred. For the time being there was only one recourse to fall back on the artificial(?) nature of the presence or absence of a genal ctenidium, and so faras. All the species of CeratopliyUus, so far as I have examined them, have on the lower disc of the fifth tarsal joint numerous very small hairs, and between the hind coxa and its sepiphysis distally. Male claspers twice as long as wide, tapering in apical half down to a truncate tip; .. difference with a number of scattered bi-istles and minute, faint. The back of the head is furnished with tlie usual ])ri.stles, . the discof the vertexwithoneavy bristk^ ])eliindmes of the antennal furrow. Upper spurs more than twice as long as broad, somewhat drake-shaped, but broad and o1)tuseattip. . posterior border with few' l) faint whorls. Behind the middle of the antennal groove on the disc of the vertex there is one strong})rist. The antennal groove extends to the upper edge of the head, and is suddenly widened in the. On the middle of the back of the antennal groove a few minute hairs appear, while just behind the margin on the disc of the vertex stands one stout hair. Behind the center of the antennal groove are two small bristles - the usual large, stout bristles are missing. The upper ol)lique row of five small bristles extends from the edge of the antennal groove to the lower edge of the head. The back edge of the head has two or three bristles above and the usual strong one on each side l)elow. One spine occurs on the disc from the vertex l)ehind the middle of the antennal groove. He did not give the host, although it will probably prove to be one of the moles. The antennal groove reaches three-fourths the depth of the head, is not connected with the opposite antennal groove by a proboscis which does not pass over the top, and is. On the disk of the vertex come extensions of th(^ two rows of bi-istels . on gena in front—about seven bristles above and eight below. The first joint of the hind tarsus has five groups of spines on both edges; hind joint with ])utes heavy spines, four on either margin. The first joint of the hind tarsus has four groups of spines on both edges; parietal spines on second joint shorter than third joint. The lower set of genital bristles is represented by very weak and slender bristles on the edge of the antennal groove and similarly on the lower edge of the head. The first joint of the hind tarsi has four sets of spines on the anterior margin and two sets on the posterior margin. 428 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvu. . set of several \ok\g and a few short, strong hairs. Plampshire, in Peromy.'icus, by Mrs. A. T. Slosson, which represents a different species in that it possesses a ctenidium of two spines on either side of the head. The upper edge of the head is very gradually rounded from the back of the head to the front notch, thence downwards and backwards towards the mouth. The common bristles appear on the posterior inset of the head, the larger one at each lower corner being short and strong. The hairs on the second front joint are shorter than the third joint. There are six or eight minute l>ristles along the back of the antennal groove. The eighth segment laterally near the lower part of the posterior margin bears numerous long and mimber of shorter setae. There was no ill-conceived intention about the half-hearted attempt to cross-Stejj/iano-cirmis "under the heel" - the organism will still exist in its original status, regardless of what any of us write about it. The simple fact about Mr. Skuse's description is that of all it represents in the generic characterization only a single diagnostic generic character - pectinated .. 34;cap-like patella" on the head - other characters )) are common to other genera, separately or in combination. 433 LIST OF SIPHONAPTERA OF THE WORLD, WITH BIBLIOGRAPHY, LIST OF SIPHONAPTERA OF THE WORLD, WITH BIBLIOGRAPHY. The Palfearctic and Nearctic regions each have a genus unknown to the other, the other genera being common to the two. The order is very homogeneous north of the equator, very heterogeneous near and south of it, South America giving the greatest number of isolated types. Species specific to these areas have not been described from Central America, Polynesia, Flapan, China, India and South Africa. BIBLIOGRAPHY SPECIAL PAPERS ONLY APPENDIXSYNOPSIS OF SPECIES
SYNOPSIS OF AMERICAN SPECIES
422 PROCEEDINGS OF THE NATIONAL MUSEUM
HOSTS," AND HABITATS
HOST INDEX.- Class AVES
