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XJNITED STATES NATIONAL MUSEUM BULLETIN 224 



with a characteristic, long, slender, pronglike superior 

 forceps which separates ratlier widely both at base and 

 apex ; in some species the apex curves towards the mid- 

 line. Gonopod only half as long as the forceps. 

 Hypandrium short, and the aedeagus forms a simple 

 tube. The female ovipositor consists of a short, sub- 

 cylindrical, slightly compressed eighth tergite with 

 accompanying stemite below, and with short ninth 

 and tenth segments, the latter being free. The eighth 

 segment bears a few, slender bristles and some bristly 

 setae. 



Distribution: Neotropical: Glaphyropyga aristata 

 Carrera (1950) ; himantoccra Wiedemann (1828) ; pol- 

 linif era Ca,Tr&ra, (1945) ; setosifemur 'Endevle'in (1914). 



Australian: Glaphyropyga australasiae Schiner 

 (1868). 



Genus Opopotes Hull 



FiGUKES 363, T47, 1493, 1502, 2357, 2400 



Opopotes Hull, Ann. Mag. Nat. Hist., ser. 12, vol. 10, p. S84, 1957. 

 Type of genus: Opopotes attenuatus Hull, 1957, by original 

 designation. 



Rather small, slender asilids with greatly reduced 

 pilosity; the wings and abdomen are slender, the face 

 extremely nari'ow. The antenna is slender, especially 

 on the third segment, which is attenuate distally until 

 it becomes nearly filiform and no thicker than the 

 slender, two-segmented style. From Senoprosopis 

 Macquart it is distinguished by the restriction of 

 bristles to the lower fourth of the face, the ventral 

 divergence of the face and the form of the antenna 

 and from Glaphyropyga Schiner by the form of the 

 antenna. Length 13 mm. 



Head, lateral aspect : The face is visible only on the 

 lower tliird and then due only to the posterior recession 

 of the eye; the profile is nearly straight and vertical. 

 Eye of moderate length, strongly convex anteriorly and 

 nearly plane posteriorly at least through the greater 

 part of the middle; it is slightly recessive anteriorly 

 above and still more recessive below. The occiput is 

 quite short but present over the whole posterior border 

 of the eye. Pile of the occiput fine and scanty even 

 ventrally, where it is slightly more abundant; in the 

 middle and dorsally there are very weak, slender 

 bristles. The proboscis is long, rather slender, subcylin- 

 drical except towards the base where it is a little 

 swollen both dorsally and laterally ; the apex is bluntly 

 rounded with a few stiff hairs; the base carries only 

 2 or 3 long, stiff hairs. Palpus unusually slender and 

 cylindrical with a few ajDical, bristly hairs and a few 

 others ventrally and ventrolaterally. The proboscis in 

 the specimen before me is directed obliquely forward. 

 The antenna is attached at the upper fourth of the 

 head ; the first segment is slender, slightly longer than 

 the second. The third segment is elongate and un- 

 usually slender, widest near the base and strongly 

 narrowed distally mitil no wider than the style. It 

 bears a quite long microsegment followed by a short 



style which is a little expanded towards its apex and 

 carries a comparatively long, slender bristle. The 

 microsegment if considered part of the style results in 

 a 2-segmentcd style. First segment with a few minute 

 setae ventrally and a dorsal apex and with a single very 

 stout, long, oblique bristle which extends beyond the 

 second segment. Second segment with a few setae. 



Head, anterior aspect: The face below the antenna 

 is a tenth the head width and in the middle becomes 

 even more narrow; it is distinctly widened at the 

 epistoma and more at the bottom of the eyes. Sub- 

 epistomal area moderately large, deeply concave, pubes- 

 cent and oblique. The face is pubescent and apilose, 

 with 3 pairs of long, slender bristles on the lower third ; 

 each lower, more ventral pair is set farthest apart and 

 on the epistomal margin there are 2 additional pairs, 

 the middle pair stouter ; there are 2 fine bristles along 

 the lateral margin of the subepistoma. Front very 

 slightly widened, slightly convergent across the ocelli 

 but the upper vertex a little wider ; the front is short, 

 pubescent, with 2 fine, stiff hairs laterally on each side ; 

 the vertex is moderately excavated, the ocellarium of 

 moderate height but small with vertical sides and 

 bearing behind the ocelli a pair of slender bristles 

 strongly curved forward. Anterior eye facets greatly 

 enlarged. 



Thorax: The thorax is pollinose. The pile of the 

 mesonotum is almost reduced to none. There are a 

 few, fhie acrostical elements in a double row anteriorly 

 and 2 or 3 other fine hairs laterally ; a single, fine, slen- 

 der, dorsocentral, bristly hair anterior to the suture; 

 and beginning at the suture, are 3 pairs of long, slender, 

 dorsocentral bristles on the posterior half of the mes- 

 onotiun. Humerus with 2 or 3 fine hairs. The follow- 

 ing long, slender, lateral bristles are present: 2 noto- 

 pleural, 1 postsupraalar, 1 suprapostalar, 1 post alar, 

 and 1 pair of scutellar. The scutellum is pollinose, 

 thick and convex with distinctly impressed rim and 

 rather deep, basal crease. Propleuron with a few scat- 

 tered hairs ventrally and 2 or 3 pairs posterolaterally. 

 Postmesopleuron and upper sternopleuron with a few, 

 fine hairs. Pteropleuron and posthypopleuron likewise 

 with a few, fine hairs. Metapleuron with a vertical row 

 of 7 or 8 moderately long, slender bristles; metanotal 

 callosity without pile ; lateral metastemum with numer- 

 ous, long, fine hairs, the ventral metastemum with 3 

 or 4 fine, long hairs on each side ; postmetacoxal area 

 apparently chitinized. Posterior basalare with a few, 

 fine hairs ; squama with a simple fringe in 2 or 3 rows. 

 Prosternum dissociated. 



Legs : Both the middle and hind femora are distinctly 

 elongate, especially the posterior pair. The hmd femur 

 is slender basally, slightly dilated from near the base, 

 the maximum dilation is on the outer third ; all the pile 

 is scanty, the dorsal and lateral pile is fine, short and 

 appressed. The following complement of bristles is 

 present on the hind femur: A subapical, dorsolateral, 

 and dorsomedial bristle, with a dorsolateral element at 

 the basal sixth; 3 ventrolateral on the outer half, 2 



