262 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



a long, bladelike, unswollen empodium, and very short 

 pulvilli reduced to one-third or one-fourth the length 

 of the claw. 



Wings : The marginal cell open by a distance some- 

 what less than its width ; anterior branch of third vein 

 ends above the wing apex ; posterior branch ends a short 

 distance behind. All posterior cells are widely open, 

 except the fourth which is greatly narrowed and is open 

 by a fourth its maximum width. Anal cell closed in 

 the margin. The second basal cell ends in two veins; 

 alula large; ambient vein complete. 



Abdomen : The abdomen is short and robust, basally 

 as wide as the mesonotum. The abdomen is very short 

 pilose across the middle and has some pollinose bands ; 

 it is a little tapered from the base ; the lateral pile is a 

 little longer, sides of the first tergite have 6 or 7 bristly 

 hairs and some additional, long pile. The male has 

 seven tergites, the fifth tergite a little more than half 

 as long as the fourth, the sixth and seventh tergites 

 each are only half as long as the fifth and in consequence 

 both are quite short. Male terminalia in the type of 

 genus is extremely large, elongate dorsoventrally and 

 clublike, and half-rotate. 



Distribution: Neotropical. Theromyia ?nurina 

 Philippi (1865) [ = calopyga Schiner (1868)]. 



Genus Aphamartania Schiner 



Figures 174, 183, 371, 554, 561, 1143, 1145, 1152, 1154, 1758, 1856, 

 1857, 1951 



Aphamartania Schiner, Verh. zool.-bot Ges. Wien, vol. 16, p. 

 671, 1866. Type of genus : Aphamartania frauenfeldi 

 Schiner, 1866, by original designation. 



Medium size, robust flies with the abdomen at the 

 base as wide as the mesonotum, moderately tapered 

 beyond and characteristically with large, conspicuous 

 male terminalia. The eye is distinctly wider on the 

 ventral half, the face rather strongly divergent below. 

 The proboscis extends at least as far as the mystax and 

 is directed horizontally forward. There is a thin row 

 of acrostical setae or bristles distinctly differentiated. 

 Length 11 mm. 



Head, lateral aspect: The face is gently produced 

 and short beneath the antenna, gradually rising until 

 upon the lower third it is gently convex and rather 

 prominent. The eye is distinctly longer on the lower 

 half, being somewhat narrow above; it is convex pos- 

 teriorly, though nearly plane for about a third its 

 height on the area which lies at and just above the 

 middle. The occiput is short throughout the entire 

 head and follows the curvature of the eye. Pile of the 

 occiput is rather dense and fine on the ventral half 

 but comparatively short above; the upper half bears 

 numerous, weak, slightly curved, pale bristles. The 

 proboscis is stout, plane on the ventral surface, gently 

 arched to a point from the dorsal aspect, with a mod- 

 erately high medial ridge which extends to within a 

 short distance of the apex. The proboscis is directed 

 horizontally forward and bears, besides other long 



hairs on the basal half, ventrally at the middle, 2 or 3 

 long, bristly hairs which are directed obliquely forward 

 and outward. Palpus clearly of two segments, the first 

 excavated, the second cylindrical, slightly swollen 

 through the middle, and without apical pore. An- 

 tenna attached just above the middle of the head, mod- 

 erately elongate, the first segment as long or slightly 

 longer than the second, the third segment together with 

 its microsegment is 1^ times as long as the combined 

 length of the first two segments. The third segment 

 is slightly widened through the middle and narrowed 

 at the obliquely truncate apex. It bears a moderately 

 long, basally stout spine. 



Head, anterior aspect: The subepistomal area is 

 large, oblique, concave, bare. The face is pubescent on 

 the upper half, shining below, apilose, with the lower 

 half densely beset with numerous, pale yellow, bristly 

 hairs. The face is strongly divergent below. The 

 front is wide, flat, with a V-shaped depression below 

 the ocelli. Vertex rather moderately excavated, with 

 slanting sides, but the ocellarium is large, wide, high, 

 with vertical sides, with very large ocelli and 2 pairs of 

 long, stout bristles, with 2 other shorter bristly hairs, 

 besides one long and one slender bristle behind the 

 ocelli. The front has at most 1 or 2 short hairs but 

 several curled, bristly hairs laterally to each side of the 

 front ocellus. Anterior ocellus greatly enlarged and 

 widened ; anterior eye facets greatly enlarged. 



Thorax : The mesonotum and pleuron pollinose, the 

 pile of the mesonotum is moderately abundant and 

 bristly. The anterior pile arises from small tubercles ; 

 there is a distinct row of short, fine acrostical elements 

 present anteriorly, with a wide space on either side. 

 Dorsocentral elements differentiated only on the pos- 

 terior half of the mesonotum ; they are short and form 

 a double row; immediately in front of the scutellum 

 they become longer and stouter and constitute a cluster 

 of 5 on each side. Humerus with 5 or 6 long bristles. 

 Lateral mesonotal bristles pale, long and quite stout: 

 3 notopleural, 1 supraalar with other long bristly hairs, 

 2 postalar, and 3 pairs of scutellar bristles. Scutellum 

 convex on the outer half, the basal half a little flattened, 

 the whole pubescent. Propleuron with dense, long 

 pile and no bristles. Mesopleuron with only a few, 

 short, stiff hairs posterodorsally and along the posterior 

 margin. Sternopleuron with pile only anteriorly; 

 pteropleuron and hypopleuron apilose; metapleuron 

 convex, protuberant, with a dense band of very long 

 bristly hairs; metanotal slopes strongly bullose and 

 micropubescent only. Lateral metasternum densely 

 pilose posteriorly, separated from the anterior portion 

 by rectangular crease; ventral metasternum narrow, 

 chitinized, pilose, behind it the first sternite is narrow, 

 chitinized, apilose and separated by a membrane from 

 the pubescent metasternum. Postmetacoxal area mem- 

 branous; tegula with 2 or 3 setae; prosternum 

 dissociated. 



Legs : The anterior and middle femora are quite stout 

 and a little thickened, the hind femur rather more 

 strongly thickened, narrowed only near the base and 





