36 



UNITED STATES NATIONAL MUSEUM BULLETIN 22 4 



with oblique sides, ocelli set at vertex. Ocellar bris- 

 tles consist of 3 or 4 pairs of moderately long, stiff, 

 slender bristles. 



Thorax : The thorax is pollinose and generally dull ; 

 the pile is scanty, fine and erect, becoming much longer 

 in front of the scutellum, where there is an irregular 

 double row of hairs on each side. Acrostical and 

 dorsocentral bristles present anteriorly. Humerus with 

 numerous, fine, long hairs. The mesonotum shows a 

 tendency to a moderate complement of long bristles of 

 moderate thickness and which become fine apically. 

 Material studied shows the following complement of 

 bristles: No humeral or posthumeral bristles, 2 noto- 

 pleural, 2 supraalar, 3 postalar, and 4 pairs of scutellar 

 marginal bristles. The scutellar surface is quite flat, 

 with 12 fine, erect hairs confined to the sides; surface 

 densely pollinose; margin without bristles or hairs. 

 Pleuron pollinose, with pile absent on the hypopleuron ; 

 lower propleuron and upper propleuron with numerous, 

 long, fine hairs and no bristles; anterior pronotal collar 

 with numerous, fine hairs and a few weak bristles. 

 Poststernopleuron with 8 to 10 long hairs. Mesopleu- 

 ral junction with a tuft of short pile. 



Legs: All femora stout, especially the anterior and 

 middle pair. Hind femur slightly attenuate basally; 

 tibia not greatly thickened. The hind femur bears 

 stout, moderately long bristles: 1 dorsal near apex, 2 

 dorsolaterals in a row shortly removed from apex, 

 and 3 laterals situated over the middle area. The hind 

 tibia is densely appressed pilose with a few long, scat- 

 tered bristly hairs ventrally and laterally and medi- 

 ally near the base, and bears stout, curved moder- 

 ately long bristles as follows: 3 dorsomedial, 3 dorso- 

 lateral; 3 ventrolateral; the apex bears 2 medial, 1 

 dorsal, 3 laterals, and 2 long ventrals enclosing two 

 short bristles. Hind metatarsus little more than half 

 as long as the remaining segments. Midfemur short 

 appressed pilose above, densely, long, bristly pilose 

 below, with a stout, long bristle anteriorly just be- 

 yond the middle and another posteriorly near the 

 apex; its tibia has moderately long, basally stiff, fine, 

 attenuate bristly pile situated posteriorly, anterodor- 

 sally, and anteriorly, as well as ventrally. The middle 

 tibia is densely appressed pilose with a few long, scat- 

 stout bristles as follows: 2 anterior bristles from the 

 middle and beyond, 2 anterodorsal, 2 posterodorsal, 1 

 posteroventral, and at the apex 1 anterior, 2 dorsal, 

 1 posterior, and 4 ventral bristles. Anterior femur 

 with long, stiff, bristly pile dorsally, but confined to 

 the posterior half and extending undiminished on the 

 posterior and ventral surfaces. Its tibia is similarly 

 covered with long bristly pile on the same area, and has 

 3 posterodorsal bristles. Apex of anterior tibia with- 

 out spine, pulvillus well developed. 



Wings : Marginal cell widely open. Anterior branch 

 of the third vein ends before the wing tip, fourth pos- 

 terior cell closed and stalked. The second basal cell 

 is closed with 2 veins and a short stalk beyond. Anal 



cell closed and stalked. Alula moderately wide; am- 

 bient vein complete. 



Abdomen : The abdomen as long as the wings, gently 

 tapered, distinctly flattened, the first tergite is later- 

 ally swollen and convexly ridged and this segment 

 is as wide as the mesonotum. Female with more 

 strongly attenuate and pointed abdomen. Six tergites 

 are well developed in the male, the seventh is visible 

 dorsally but quite short, the eighth can also be seen 

 from above but is a mere linear ridge. Seven tergites 

 present in the female; the eighth forms part of the 

 ovipositor. There are 2 or 3 weak bristles, or coarse 

 bristly hairs, present in the posterior corners of ter- 

 gites 2 to 6. Male terminalia conspicuous, epandrium 

 cleft into superior forceps, which are well developed; 

 terminalia not rotate. Female terminalia short, thrust 

 obliquely upward, with the terminal portion held at 

 right angles and without spines. 



Distribution : Neotropical : Pritchardia hirtipes Mac- 

 quart (1838) ; puella Bromley (1932). In the Chilean 



area. 



Genus Aplestobroma Hull 



Figuees 13, 405, 808, 81 T, 1651, 1905, 1906, 2036, 2243, 2246 



Aplestobroma Hull, Psyche, vol. 64, no. 3, p. 93, 1957. Type of 

 genus: Aplestobroma avida Hull, 1957, original designation. 



Flies of medium size, characterized by the subcircu- 

 lar head with very narrow face and the rather cylin- 

 drical, narrow abdomen, and readily recognized in the 

 males by the long, dorsally placed hypandrium, which 

 curls down apically and posteriorly over the termi- 

 nalia. Male terminalia fully rotate. In the females 

 the terminalia are deeply recessed within the eighth 

 tergite, which forms an overlapping hood. Spines of 

 acanthophorites are absent. The anal cell is open; 

 fourth posterior cell closed. Length 16 mm. 



Head, lateral aspect : Face in profile scarcely visible 

 on the upper three-fourths and only moderately pro- 

 tuberant below and not produced beyond the general 

 plane of the face. Eye unusually long and strongly 

 convex anteriorly, slightly wider above, nearly plane 

 over the middle portion of the occiput and not recessed 

 below. Occipital pile present only below; it is mod- 

 erately long and fine and abundant on the lower half 

 of the head, replaced by numerous bristles above. The 

 anterior row of bristles consists of 9 pairs and the bris- 

 tles are exceptionally stout and very strongly procli- 

 nate. Below and just above the middle of the head 

 is a band of weaker bristles in 3 or 4 rows of 7 or 8 

 bristles each; these extend entirely around the upper 

 portion of the occiput. Proboscis short but unusually 

 stout, gradually swollen towards the base and bearing 

 an exceptionally high medial ridge. The apex is dor- 

 soventrally depressed and therefore in profile appears 

 rather narrow and attenuate apically. It bears a num- 

 ber of fine but stiff hairs along each ventrolateral mar- 

 gin but only 3 or 4 hairs dorsally at the apex. Basal 

 half of the ventral margin with some long, fine hairs. 



