472 



TJNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



Legs : All the femora are stout and a little swollen, 

 especially the first 4 with the anterior femur rather con- 

 spicuously enlarged towards the basal half. The pile is 

 long and coarse or bristly, appressed only along the 

 dorsal or anterior surface. The bristles are quite stout. 

 On the hind femur are 3 lateral bristles along the mid- 

 dle, 1 dorsolateral at the subapex, 1 dorsomedial at the 

 apex, and 4 ventrolateral bristles. The hind tibia bears 

 at the base 1 dorsolateral bristle, another at the middle, 

 1 lateral at the outer third, 1 ventral at the outer fifth. 

 Hind basitarsus rather short and stout, as long as the 

 next three segments. Middle femur with 2 stout bristles 

 anteriorly on the outer half, 3 anteroventral bristles, 1 

 at the middle, and 2 beyond and at the apex 2 postero- 

 dorsal bristles. The middle tibia has only bristly hairs 

 anteriorly, 2 weak posterodorsal bristles beyond the 

 middle, 4 longer, weak, posteroventral bristles, and 3 

 ventral bristles on the outer half, the last element being 

 quite stout. Anterior femur with extremely abundant, 

 long pile ventrally, long bristly hairs posteriorly and 

 dorsally, but no bristles. This tibia has 4 small bristles 

 anterodorsally on the basal fourth, 5 slightly longer 

 posterodorsal bristles and posteroventrally and below 

 with a fringe of many long, bristly hairs. Claws stout, 

 sharp ; pulvillus quite large ; empodium bladelike. 



Wings : The wings are tinged with brown, the mar- 

 ginal cell is narrowed apically, closed and with a long 

 stalk. The anterior branch of the third vein ends well 

 above the wing apex, the posterior branch very shortly 

 behind. The anterior branch bears near the base a dis- 

 tinct spur vein. Posterior crossvein absent. Alula 

 large ; ambient vein complete. The third vein forks at 

 or immediately beyond the end of the distal cell. 



Abdomen: The abdomen has fine, scattered, subap- 

 pressed hairs in the middles of the fourth and succeed- 

 ing tergites. Sides of the first 3 tergites with numerous, 

 long and bristly hairs but no tufts of parted pile. Sides 

 of first segment with 3 or 4 stout bristles and other 

 weaker elements. All sternites with long, fine, erect 

 pile, dense only on the first three sternites. Males with 

 eight tergites, the eighth shortened in the middle, longer 

 laterally. Females with seven segments not incorpor- 

 ated in the ovipositor. Sixth and seventh segments in 

 the males with silver pollen. Male terminalia like 

 Nerax with an immense, clublike structure which con- 

 sists of the very large, apposed, superior forceps, densely 

 bristly ; the proctiger is short and exposed ; the hypan- 

 drium has a posteromedial process. The gonopod is 

 prominent and wide at the base with a long, narrow, 

 distal process; its whole ventral surface has a dense 

 fringe of bristly pile. Female terminalia quite wide at 

 the base and then abruptly narrowed and very strongly 

 compressed; female terminalia with a long, narrow, 

 distal process; the whole ventral surface with a dense 

 fringe of bristly pile. The eighth segment is not quite 

 as long as the two preceding segments. Ninth and tenth 

 segments shorter and equally compressed. 



Distribution : Neotropical : Porasilus harbiellinii Cur- 

 ran (1934). 



Genus Anacinaces Enderlein 



Figures 319, 708, 1434, 1443, 2199, 2236, 2485, 2490 



Anacinaces Enderlein, Zool. Anzeiger, vol. 44, p. 257, 1914. 

 Type of genus : Anacinaces gigas Enderlein, 1914, by origi- 

 nal designation. 



Very large flies. The face is nearly straight in profile 

 and therefore conspicuous ventrally only to the extent 

 that the eye recedes. On the wings the second sub- 

 marginal cell is quite narrow, except at the apex where 

 it is strongly flared and widened ; the anterior branch 

 of the third vein ends a short distance above the wing 

 apex, the posterior branch ends far behind the wing 

 apex; moreover near the base of the anterior branch 

 of the tliird vein tliere is a long spur vein. The basal 

 portion simulates a straight, oblique crossvein. Length 

 about 33 mm. 



Head, lateral aspect: Tlie face is very short and but 

 little produced, straight or plane in profile and rather 

 long ; it is conspicuous below because the eye is rather 

 strongly recessive. The cheeks are developed for a 

 short distance beneatli the eye ; the eye is convex ante- 

 riorly, straight for the greater part of the posterior 

 height, but quite recessive anteroventrally, on the lower 

 sixth and dorsally it rises rather strongly above the 

 occiput. The pile of the occiput is abundant, long and 

 fine, and continues up to the middle of the head where 

 it is largely replaced by bristles. In the middle there 

 are 8 pairs of slender bristles turned downward, fol- 

 lowed by 8 pairs of dorsal, stout, rather short and 

 slightly curved bristles. The proboscis is stout, moder- 

 ately long and subcylindrical and slightly swollen 

 toward the base on the dorsal aspect ; the apex is blimtly 

 rounded, and bears stiff pile and there are quite numer- 

 ous, long, fine hairs ventrally on the basal third ; a low, 

 long, medial ridge is present; also near the middle on 

 either side there is a pair of long, oblique, slender, 

 bristly hairs. The proboscis is directed chiefly down- 

 ward. Palpus long, cylindrical with bristly pile dor- 

 sally and ventrally and 6 or 7 quite stiff, long bristles 

 apically ; there appears to be a renuiant or trace of the 

 basal segment present. Antenna attached to the upper 

 third of the head; the first two segments are rather 

 shoi't, the first robust, twice as long as the second, bear- 

 ing 7 or 8 short setae ventrally and a few dorsally. 



Head, anterior aspect : The face below the antenna is 

 less than a fifth the head width and divergent at the 

 epistoma. The subepistomal area is long, oblique, 

 deeply concave and pubescent. Face very minutely ap- 

 pressed pubescent ; the upper half has considerable, fine, 

 moderately long pile, bristly in character, the lower half 

 bears a triangular patch of moderately long, but ex- 

 ceptionally stout, black bristles ; there is a single bristle 

 dorsally at the head of this triangle, with 4 bristles 

 transversely below, followed by a row of 3 pairs of 

 bristles; also there are 2 additional pairs on the lowest 

 part of the face and 1 on eacli side of the lateral, sub- 

 epistomal margin. Front pollinose, with a row of 10 



