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UNITED STATES NATIONAL MUSEUM BULLETIN 224 



Subepistomal margin without bristles. The front is 

 very slightly wider than the upper face, each side bear- 

 ing 7 or 8 bristly hairs. The vertex is quite shallowly 

 excavated. The ocellar protuberance unusually low, the 

 ocelli of moderate size, the protuberance bears 2 pairs 

 of quite long, moderately stout, divergent bristles and 

 a single pair of shorter hairs laterally. Central eye 

 facets very slightly enlarged. 



Thorax: The thorax is densely micropubescent, in- 

 cluding the pleuron. The mesonotum is comparatively 

 high and anteriorly rounded and gently arched behind. 

 The mesonotum bears almost no pile but has a conspicu- 

 ous complement of numerous, unusually long bristles. 

 There is a double acrostical row of long, slender, back- 

 wardly turned bristles confined to the anterior third 

 but extending anteriorly to the bottom of the mesono- 

 tum. Beginning opposite the humerus there is a double 

 row of long, dorsocentral elements with an inner row 

 distinctly longer and stouter. The dorsocentral bristles 

 continue to within a short distance of the scutellum. 

 Scutellum convex and pubescent. Humerus with a few, 

 fine hairs and 3 stout, pale bristles. The remaining 

 long, stout, lateral bristles consist of : 3 notopleural, 2 

 postsupraalar, 4 postalar and 2 pairs on the scutellar 

 margin. The propleuron bears pile and the upper 

 posterior portion has a few weak bristles, the pronotum 

 has 8 to 10 pairs of stout, yellow bristles. The meso- 

 pleuron has 2 fine hairs posteriorly. Pteropleuron 

 without pile; hypopleuron with 5 extremely long, deli- 

 cate hairs; the metapleuron bears a vertical band of 

 5 rather long, moderately stout, pale bristles and a 

 few additional hairs. Metanotal slopes bullose and 

 micropubescent only. Hypopleural patch spot scarcely 

 differentiated. Slopes of metasternum with 10 or more 

 fine hairs. Metasternum with 20 to 30 long, fine hairs. 

 Postmetacoxal area membranous; tegula with 3 or 4 

 short, bristly hairs. 



Legs : The femora are stout without being especially 

 thickened; the first 2 pairs are somewhat more thick- 

 ened than the hind pair. All pile and bristles pale. 

 The hind femur bears abundant, fine, appressed, setate 

 pile which becomes more scanty ventrally and there is 

 no ventral fringe. This femur shows 2 closely adjacent 

 medial and apical bristles, 5 lateral, and 3 ventromedial 

 bristles restricted to the middle, all of medium length 

 and moderately stout. Trochanter with 3 bristles. 

 Coxa with bristles only anteriorly. The hind tibia 

 bears scanty, appressed pile, a dense brush of appressed 

 setae medially extending to the middle and the follow- 

 ing bristles : 1 medial situated in the middle, 4 dorsal, 

 3 lateral, 4 ventrolateral bristles. The apex bears 2 

 medial, 1 dorsal, 3 lateral, and 4 ventral bristles. Hind 

 basitarsus short and stout. The middle femur bears 2 

 anterior bristles, 1 near base and 1 near apex ; this tibia 

 bears 3 anteroventral, 6 anterodorsal, 5 posterodorsal, 5 

 posteroventral, 3 ventral bristles. These bristles are 

 oblique, rather stout and of moderate length. The 

 apex bears 1 anterior, 2 dorsal, 1 posterior, and 4 

 ventral bristles. Anterior femur with 1 weak posterior 

 element near the apex. The anterior tibia has an ante- 



rior brush of setate pile; there are 6 short, anterodorsal 

 bristles, 4 longer posterodorsal, 5 posterior and 4 poster- 

 oventral bristles which are considerably longer than the 

 remainder. Apical complement similar to midtibia and 

 without any spine. All tarsi bear long, well developed 

 pul villi ; long, sharp, basally thickened empodium ; and 

 sharp claws. 



Wings: The marginal cell is open, the fourth pos- 

 terior cell is closed with a long stalk ; the second basal 

 cell is closed with 3 veins, the middle element at least 

 half as long as the anterior element. The anterior 

 branch of the third vein ends before the apex of the 

 wing. Alula well developed; ambient vein complete. 



Abdomen: The abdomen is cylindroid and slightly 

 tapered, not quite as long as wings. The first tergite 

 is not quite as wide as the mesonotum, only slightly 

 ridged and widened laterally. In the female eight 

 tergites are present but the eighth is only one-third 

 as wide as the seventh. Pile of abdomen scanty, fine, 

 erect and short, a little longer on the sides of the first 

 three tergites. Bristles are restricted to the first ter- 

 gite which bears 7 pairs of shoi-t, stiff, pale bristles. 

 Sternites with long, fine pile beginning with the second. 

 The female terminalia are quite short and recessive but 

 this may represent an abnormal condition as only a 

 single specimen is available for study. Several pairs 

 of acanthophoritic spines are recessed but are visible. 

 The ventral plate is strongly compressed laterally into 

 a flattened, ventrally split, rounded, short, scooplike 

 prolongation. 



Distribution: Neotropical: Zabrotica clarkei Hull 

 (1958). 



Genus Hypenetes Loew 

 Figures 131, 463, 952, 961, 1018, 1025, 1932 



Hypenetes Loew, Ofvers. Svenska Vet.-Akad. Forhandl., p. 



349, 1858. Type of genus: Hypenetes stifftnatias Loew, 



1858, by monotypy. 

 Clavator Philippi, Verh. zool.-bot. Ges. Wien, vol. 15, p. 699, 



1865. Type of genus: Clavator ptinctipcnnis Philippi, 1865, 



by present designation, the first of 5 species. 



Hypenetes has 1 subgenus, Tillobroma, new sub- 

 genus. 



Small to medium size flies with all of the pos- 

 terior cells open, the anal cell open or narrowly 

 closed, the scutellum with a long fringe of bristles, the 

 abdomen tapered. The face is gibbous, produced and 

 bears dense, long bristles. They are especially char- 

 acterized by the third antennal segment being distally 

 swollen and strongly attenuate at base with a rather 

 long, conspicuous microsegment. Length 10 to 17 mm. 



Head, lateral aspect: The face is conspicuously pro- 

 duced and convexly rounded from any aspect, becoming 

 plane with the eye for a very short distance beneath 

 the antenna. Eye of moderate length, strongly and 

 gently recessive on the lower half posteriorly and 

 slightly narrowed anteriorly on the lower half. The 

 occiput has dense, long, fine pile ventrally, the dorsal 



