DISCUSSION.—Dohrniphora cavifemur is a very striking species, both sexes easily recognized by the deep dorsal depression near the base of the hind femur. The male is easily recognized by the lanuginous coat of the front and middle coxae and the middle femur. Scutellum with 2 long posterior setae; the front ones are hairy and one-third to two-fifths as long as the last.
The male is easily recognized by the wide forefoot (Figure 11) and the fluffy color of the last tarsal joint of the forelimbs.
M.(M.) diplochaeta, new species Hypopygium without bristles; antials midway between supraantennals and laterals
M.(M.) gracUipalpis, new.species Palpi normal 42
Antials slightly below level of upper postantennals, slightly longer from them than from laterals, which are slightly above level of upper supraantennals. Abdomen opaque, vent yellow; tergites black, other yellow at base and with bristles on side; 5th and 6th with bristles on the back edge, the lateral ones longer. Tergites as in his figure 1 (Borgmeier, 1962b); 3rd as long as 2nd, with posterior margin straight; 4. vestigial, variable in size, semicircular; 5. transverse, with 8 long bristles on the back edge.
DISCUSSION.—A very striking species of Group I, easily recognized by the long setae on the 5th tergite of the female and on the posterior margin of the 5th and 6th tergites in the male.
Megaselia (Aphiochaeta) fasciiventris (Enderlein)
Abdomen opaque, black, grayish dusted; 2nd tergite elongated, 3-6 undersized, sparsely pubescent, some bristly hairs laterally and on the posterior margin of the 6th. Posterior femur broad, ventral hairs on the basal half short, delicate, Posterodorsal setulae on the posterior tibiae strong below the middle, weaker above. Antials slightly below the level of the upper supra-antennae, slightly further from them than from the ocular margin and from anterolaterals; the latter are placed slightly higher.
Belly: belly light yellow; tergites dark brown, a little paler brown in the center and on the anterior half of the 2nd tergite; the latter with 2 bristles on the side.
Megaselia (Aphiochaeta) spiculata, new species
Third antennal joint brown-yellow, of normal size; arista a third longer than the width of the frown, clearly hairy. Hypopygium dark brown, medium sized, dull, with bristles on the underside and on each side with 2 conspicuous bristles on the back; dorsally exposed. Hind femur moderately broad, with a distinct border of long hairs on the ventral edge of the basal half.
It is a nice strong shiny species and is easily recognized by the two supraantennal and the rough frontal punctures.
Megaselia (Aphiochaeta) parviseta, new species
Megaselia (Aphiochaeta) destituta, new species
Frown as wide as long medially (0.31 mm), dark brown, slightly shiny, sparsely pubescent, with a fine midline. Hind thigh about three times as long as wide; basal half of the ventral margin with 9 short curved hairs or setulae. Hind thigh 3 times as long as wide; the hairs on the basal half of the ventral margin are short and inconspicuous.
There are several undescribed Neotropical species which have the anterior scutellars half as long as the posterior ones.
Megaselia (Megaselia) scalar is (Loew)
Lower su rudimentary, about one-third as long as upper which is about one-quarter of anterior frontal width apart. The color of the abdominal segments 1-6 is highly variable (the terminal segments 7-10 are always black). DISCUSSION.-The female is easily recognized by the long 6th tergite; the male by the hair of the hippiegium.
DISCUSSION. – A striking species easily recognized by the structure of the abdomen and especially by the two curved rows of setulae on the fourth ventrite.
Megaselia (Megaselia) leptacina, new species
21 6th sinuous. Anal margin broadly convex; axillary
Megaselia (Megaselia) imitatrix, new species
Forehead distinctly higher than wide, width 0.23 mm, lateral length 0.28 mm, median length 0.33 mm, black brown, distinctly pubescent, with distinct median line. Pubescence short, few bristly hairs on side 2 and posterior margin 6. Hind femur 3 times longer than wide, width 0.26 mm, length 0.75 mm, ventrobasally with a row of 5 conspicuous curved hairs not reaching middle .
Hind femur rather broad (ratio of the latter in specimens from Dominica), ventral hairs on semi-short basal, inconspicuous. Tergites subequal in length, with short sparse pubescence, hairs on posterior margin of 6th tergite hairlike. Foretibia 0.19 mm; pre-metatarsus (Figure 67) strongly expanded, wider than tibia, with a broad longitudinal groove on ventral side, length 0.14 mm, width 0.052 mm;.
Hind femur 3 times as long as wide, on basal half of ventral margin with 5 long curved hairs (Figure 65). Frons wider than long laterally (5:4), width 0.19 mm, lateral length 0.15 mm, median length 0.16 mm, dark brown, sparsely pubescent, with a distinct median line. Foretarsus (Figure 62) longer than tibia, length 0.33 mm, joints 1-4 thickened, gradually attenuate, all joints longer than wide;.
Hind femur 0.45 mm, about 3 times longer than wide, with about 7 visible recurved hairs on basal half of ventral margin. Anal angle not prominent; axillary margin with 2 hairs. M.) tarsodes, a new species, is a small species close to M.
Megaselia (Megaselia) substricta, new species
Third vein without bristles at base; 4. weakly arcuate, especially on the basal half; 5th and 6th weakly sinuous; 7. weak. Third tergite as long as 2nd, narrowed in middle, sides excavate; 4th card, 5th and 6th trapezoid; 4th and 5th with a nail (indicated by dashed lines), which is usually covered by the posterior edge of the preceding tergite;. Hind femur 0.52 mm, width 0.18 mm, ventro basalt with some short hairs and approx. 5 fine, long hairs on the basal half.
Anal segment of medium size, brown, hairy, on each side with a long hair directed downwards, the terminal hairs short. Hind femur (Figure 73) about three times as long as wide, with seven curved long hairs on the basal half of the ventral margin. Third antennal joint slightly enlarged, compressed, lens-shaped, dense and short hairy, length 0.19 mm, light yellow; arista relatively short, 0.40 mm, finely hairy.
Palpi (Figure 77) yellow, slender, fusiform, length 0.24 mm, with very short setulae and fine hairs, apical setula slightly differentiated. Anal segment of good size, whitish or yellow, terminal hairs hardly longer than the other hairs. Hair seam of midtibia reaching apical 3rd; cilia distinct; terminal spur almost as long as metatarsus.
Hind femur 3 times longer than wide, with about 8 delicate curved hairs on basal half of ventral margin. Hind femur (Fig. 80) 3 times longer than wide, length 0.52 mm, with about 12 curved hairs on basal half of ventral margin.
Megaselia (Megaselia) ferruginosa (Brues) FIGURE 81
Paratypes (USNM, CTB) 2 males, one in alcohol and the others on 2 slides, same locality, date and collector. DISCUSSION.-Megaselia (Megaselia) gracilipalpis, new species, is a very striking species, easily recognized by the slender palpi and hypopygium structure and chaetotaxy; the venation is also characteristic. Frons (Figure 78) subquadrate, slightly wider than long lateral width 0.23 mm, black-brown, with sparse hairs and a distinct median line.
There is a weak supranumerary bristle on the lower corner of the forehead, the exact length of which could not be determined. Mediastinalis obsolete, 4th vein evenly curved; 5. weakly arched before the middle; 6. slightly sinuous. M.) pallidipennis, a new species, belongs to group VII.
- Megaselia (Megasetia) bursella, new species FIGURES 82-83
- Megaselia (Megaselia) burselloides, new species FIGURES 84-85
- Megaselia (Megaselia) paula, new species
- Megaselia (Megaselia) flavopleura (Malloch)
- Hind tibia simple 2 Hind tibia with 1 or more hair-scams 6
The supraantennals are unequal, the lower ones rudimentary, very thin and more or less half the length of the upper ones, being spaced a quarter of the frontal width apart, the lower ones being a little more approximate. MATERIAL STUDYED. Paratype male, Costa Rica (holotype female seen in Philadelphia in 1961); 10 males and 10 females (one pinned, one on slide, the rest in alcohol) from Dominica, Manets Gutter, March 15 M.) alajuelensis by the position of the antials, the long costa, the large fork, the fourth vein starting behind the fork, and the structure of tergites 5 and 6. Su unequal, the lower thin and about half in length of the upper, lying one-fourth of the frontal width apart.
The species can be recognized by the enlarged third antennal joint in males, the rather short arista, and the structure of the hypopygium, especially the left ventral plate. Lower su weak, about half the length of the upper, which are one-fourth of the frontal width apart. 37, the fork is larger and the fourth vein starts at the back. M.) alajuelensis can be recognized by the shape of the sixth tergite, which is distinctive; it is best seen in alcohol material.
Rear scutellars slightly shorter than the front, the tops of the 4 scutellars are in one line. FEMALE. - In the female from Dominica and in one female of the type series, two microscopic hairs are present beneath the rudimentary supraantennals. The female is easily recognized by the large horseshoe-shaped ovipositor, and the male by the finger-like projections of the hypopygium.
The female has only four vertical bristles; the bristles in the first and second rows are missing. Epandrium at left side of anal opening with a slender process (p) and further down with a long single bristle; on both sides of the anal opening there is a row of hairs which are curved apically. DISCUSSION.-Chonocephalus furcatus is easily recognized by the slender fork on the left side of the hypopygium.
All species of the genus Beckerina can be divided into three groups on the basis of the absence or presence of one or more hair sutures on the hind tibia: (a) hind tibia simple; (b) posterior tibia with one hairline; c) posterior tibia with several hair sutures.
INDEX
Conicera, 5 Gymnoptera, 6 nigricornis, Beckerina, 48 nitida, Pachyneurella, 44 nudipleura, Beckerina, 48 obscura, Megaselia, 27. orphnephiloides, Beckerina, 48 orthoneura, Megaselia, 32 Pachyneurella, 43. umbrimargo, Beckerina, 48 vadoni, Chonocephalus, 46 velutinipes, Aphiochaeta, 38. Manuscripts for serial publications are accepted by the Smithsonian Institution Press, subject to substantive review, only through departments of the various Smithsonian museums. If submissions are invited, the following press format requirements will apply to copy preparation.
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