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UNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



esses and the short spinous character of the bristles 

 found hi Gonioscelis. The circular head and type of 

 antenna, wing and general appearance are common to 

 both genera. Length 17 mm. 



Head, lateral aspect : The eye is comparatively short 

 and high and convex anteriorly; it is strongly reces- 

 sive anteroventrally beginning at the upper fourth of 

 the head and developing gradually so as to leave the oc- 

 ciput strongly developed and tumid ventrally. Pile of 

 occiput abundant, moderately long, coarse, and curled, 

 extending to the eye margin ventrally and almost 

 entirely replaced dorsally by bristles, though there is 

 some pile placed rather deeply medially towards the 

 foramen. Beginning at the middle of the head sub- 

 marginally there is a tuft of 6 short, white bristles fol- 

 lowed by an irregular double row of light orange brown 

 bristles somewhat stouter and extending to the vertex. 

 These dorsal bristles contain intermixed some longer, 

 more slender, strongly proclinate bristles. The pro- 

 boscis is robust, slightly tapered from the dorsal aspect 

 but with nearly parallel sides, and has a low, medial 

 ridge arising at the basal third and ending before the 

 apex, which is obtusely pointed, with a fringe of stiff 

 hairs either side; proboscis has many long, stiff hairs 

 ventrally and ventrolateially on the basal half. The 

 proboscis is directed obliquely forward and downward, 

 its length slightly greater than the head. Palpus clearly 

 of two segments, the first hemicylindrical, excavated, 

 and bearing long, stiff pile laterally and ventrally ; the 

 second comparatively slender, a little swollen in the 

 middle, porate and with numerous, slender, bristly hairs 

 dorsally, a few laterally and ventrally, none of them 

 arising at the apex. 



The antenna is attached at the upper third of the 

 head, comparatively slender, but not longer than the 

 eye; the first segment is at least twice as long as the 

 second, the short second segment is widened distally, 

 wider than the base of the third segment. Third seg- 

 ment slightly compressed laterally, widest at the apical 

 third, a little narrowed apically and bearing a short, 

 but distinct microsegment, followed by a longer, thick 

 stylelike microsegment with apical spine. First seg- 

 ment with a long, oblique, bristly hair dorsally and 

 with 12 to 14 exceptionally long stiff bristles ventrally 

 and ventrolaterally. Second segment with 2 short setae 

 dorsally and 4 ventrally. 



Head, anterior aspect: The head is nearly circular. 

 Face below antenna one-seventh of head width, diver- 

 gent below to less than one-third of width at the epis- 

 toma. The front is a little wider than the upper face, 

 the vertex likewise. Subepistomal area moderately 

 large, oblique, concave, and bare. Face thinly pubes- 

 cent, the cheeks bare. Down the middle of the face is a 

 very dense band of slender, pale, long bristles, strongly 

 curled downward and becoming considerably longer 

 ventrally but very little stronger except in the middle 

 of the lower face; laterally this band of bristles di- 

 verges and becomes wider but only extends down the 

 upper third of the epistomal margins. About one-fifth 

 of the face on each side is left without bristles or pile. 



The front is pollinose, with 2 or 3 submarginal bristles 

 and 10 or 12 additional long, stiff hairs; it has a de- 

 pressed concavity in the middle. Vertex scarcely ex- 

 cavated, the eye on either side rising above the vertex, 

 the ocellarium low, the anterior ocellus quite large, and 

 the ocellarium bearing 2 pairs of exceptionally stout, 

 rather long bristles in the middle, together with some 

 short pile, and an additional pair of stout bristles be- 

 tween the posterior ocelli. Anterior eye facets only 

 moderately enlarged, convex, not zoned. 



Thorax: The thorax is densely, minutely appressed 

 micropubescent. The mesonotal length is two times the 

 height and convex anteriorly. Pile of mesonotum 

 scanty and scattered, stiff and bristly, a little more 

 abundant on the anterior margin with a poorly differ- 

 entiated double band of acrostical, bristly hair and on 

 either side beginning at the anterior margin, excep- 

 tionally long and unusually stout, well developed dor- 

 socentral bristles with 6 or 7 elements anterior to the 

 suture, the suture being obliquely curved backword, 

 leaving much of the mesonotum in the anterior portion. 

 Behind the suture are only 2 of these long, stout, dor- 

 socentral bristles but there is an additional band of 

 long, coarse, brownish white pile extending back to the 

 scutellum. Laterally the mesonotum has the following 

 complement of exceptionally stout bristles : 2 humeral, 

 1 posthumeral, 2 notopleural, 1 presupraalar, 3 supra- 

 alar in an oblique row, 4 postalar, and 7 pairs of scutel- 

 lar bristles; all these bristles are long, except on the 

 hiunerus. The scutellum is short but quite convex and 

 thick, surface is micropubescent, apilose. Pleuron 

 with exceptionally abundant, dense, long pile ventrally 

 and laterally. The anterior collar has a row of 7 or 8 

 stout, straight, long bristles; the posterodorsal prono- 

 tum has a patch of 10 slender bristles and additional, 

 bristly hairs. Upper mesopleuron without pile; an- 

 terior corner of sternopleuron, the pteropleuron each 

 with a patch of stiff pile. Metapleuron with a band of 

 fine, comparatively short hairs and no bristles. Lateral 

 slopes of the metanotum micropubescent only, hypo- 

 pleuron apilose. Upper sternopleuron with numerous, 

 long, coarse hairs, quite in contrast to the bare meso- 

 pleuron. Lateral and ventral metasternum with a few 

 fine, long hairs; postmetacoxal area membranous; 

 tegula pubescent only. 



Legs : Anterior and middle femora a little swollen to- 

 wards the base. Hind femur stout, with fiat ap- 

 pressed, matted, white pile on the dorsal, lateral and 

 ventral surfaces, and with numerous moderately long, 

 stout, white bristles consisting of 8 to 10 dorsal, 9 to 12 

 ventrolateral, and 5 or 6 ventromedial bristles. Of 

 these elements the lateral bristles are the longest and 

 may be appressed or nearly erect; 3 of these bristles 

 are at the apex, including 1 from the lateral group. 

 Hind tibia with appressed, opaque, white pile and 

 moderately long, white bristles, 5 dorsomedial, 7 dorso- 

 lateral, and 4 ventrolateral elements, with the middle 

 bristles strong, and 2 or 3 stout, ventral medial bristles 

 lying especially beyond the middle. Apex of tibia with 

 stout, pale bristles that consist of 1 anterior, 1 antero- 



