424 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



slender, bristly hairs. The proboscis is directed 

 straight forward; its whole length is considerably 

 longer than the head and it extends well beyond the 

 antenna. Palpus long, without pore, slender, cylindri- 

 cal, sigmoid, extending far beyond the face. It is com- 

 posed of a single segment and bears numerous, slender 

 bristles on the apex and all sides except medially. 



Antenna attached at the upper fourth of the head; 

 the first two segments are short and robust, the first 

 a little longer than the second. The third segment is 

 twice as long as the first two combined, long, oval, more 

 attenuate at the basal half than on the distal half. The 

 apex of this segment is rather blunt, with a large, flat, 

 apical microsegment of which only the rim remains 

 laterally but which has a short, dorsomedial, lappet- 

 like extension and bears in the middle a short, visible 

 spine; this middle part of the microsegment is some- 

 what depressed and concave. First segment with sev- 

 eral rather long, slender bristles ventrally and ventro- 

 laterally, with more numerous, more slender, bristly 

 hairs dorsally ; second segment with long, bristly hairs 

 ventrally; dorsally from near the base are 1 extremely 

 long and 2 shorter, stout, black bristles besides several 

 still shorter bristly hairs. Third segment with a tuft 

 or row of 5 or 6 bristles placed dorsally in the middle of 

 the segment. 



Head, anterior aspect : The face below antenna is less 

 than a third the head width and rather strongly diver- 

 gent below. Subepistomal area rather large, long and 

 oblique, concave and bare ; the face is bare below, with 

 dense, pale pollen above; the face itself is clay yellow 

 but the lateral epistoma, cheeks, front and vertex black. 

 The face is apilose and bears a single pair of long, 

 rather slender, black bristles in the middle of the epis- 

 tomal margin. Front short but wide, bare, with a tuft 

 of fine, bristly hairs in the middle on either side which 

 curve outward on the apex. The lower anterior corner 

 of the vertex beside the eye margin has 5 or 6 slender, 

 short, bristly hairs. Vertex narrower than face, deeply 

 excavated, with vertical sides. The ocellarium large 

 and rather high ; it bears small ocelli and a tuft of fine, 

 short, bristly hairs on the posterior half behind the 

 ocelli. Anterior eye facets moderately enlarged, 

 strongly flattened. 



Thorax: The pleuron is shining. The elongate 

 mesonotum is brownish black pollinose and abruptly 

 vertical anteriorly, gently sloping behind. Pile of 

 mesonotum fine, scanty and short, bristly in character, 

 with almost no pile dorsally. There is a patch of rather 

 stiff, very short setae anteriorly opposite the humerus 

 and continued behind the humerus with some 10 or 

 more longer, slender, bristly hairs; acrostical elements 

 appear to be absent; there is a fine, poorly differentiated 

 band of minute, dorsolateral hairs that become slightly 

 longer in front of the scutellum. The complement of 

 stout, though rather short, lateral bristles includes 1 

 moderately long notopleural, 1 shorter supraalar, 2 still 

 shorter postalar bristles. Scutellum short, more or less 

 flattened basally but broadly rounded apically and with- 

 out marginal bristles, with only minute hairs. Pro- 



pleuron with scattered, bristly hairs ventrally and on 

 the pronotum ; the latter is notched dorsally. The pos- 

 terolateral pronotum has numerous, fine, bristly hairs, 

 the anterior part is deeply separated from the posterior 

 portion. The anterior part shelves forward as a some- 

 what hollowed lip. Mesopleuron with a few, fine, scat- 

 tered hairs and no bristles. There are still fewer, fine, 

 scattered hairs posteriorly on the sternopleuron, the 

 upper pteropleuron, and the posterior hypopleuron 

 where they are a little longer. Metapleuron unusually 

 strongly protuberant and convex posteriorly, with a 

 tuft of long, fine, bristly pile and a second tuft beneath 

 the squama. Metanotum exceptionally swollen pos- 

 teroventrally, with a lateral tuft of bristly hairs ; tegula 

 with fine, short hairs; postmetacoxal area membranous; 

 anterior basalare with a few, long, fine hairs ventrally. 

 Presternum small and dissociated. 



Legs: The legs are unusually long and slender; the 

 anterior and middle femora are of about the same 

 length; the hind femur is distinctly longer than the 

 middle femur. Hind femur a little swollen distally, 

 its tibia swollen only towards the apex where it is ex- 

 tended a considerable distance away from the basitarsus 

 and bears a conspicuous tuft of spinous bristles. AH 

 the legs shining, with very scanty, fine, appressed, 

 bristly pile which is quite short. In the type of genus 

 the following complement of bristles is present : On the 

 hind femur 5 lateral bristles, 4 of them on the basal 

 half, 2 dorsolateral bristles on the outer fourth, and 

 ventromedially a row of short, slender bristles and 

 bristly hairs, the basal ones a little longer. This tibia 

 ventrally has only a few, fine hairs and ranked setae at 

 the immediate apex, the latter continued to the middle 

 medially. There is dorsomedially 1 stout bristle near 

 the base and beyond it 2 or 3 fine, bristly hairs. An 

 equally stout dorsolateral counterpart is followed by 6 

 short, stout bristles, and laterally with 4 longer, stout 

 bristles which begin at the basal third and are preceded 

 by 2 much shorter ones; also there are 3 rather long, 

 stout, ventral bristles on the outer fourth. Apex with 

 1 stout lateral and 1 ventrolateral bristle and 2 ventral 

 bristles, besides 8 on the medial protuberance, or swell- 

 ing. Middle femur with 6 stout anterior bristles, 6 

 similar posterior bristles, and 8 short anteroventral 

 bristles. This tibia has 6 moderately long, stout, an- 

 terior bristles, the last 2 becoming more nearly antero- 

 dorsal, 5 short, dorsal and 4 or 5 short posterodorsal 

 bristles, 6 rather prominent posterior bristles, and 4 

 stout, ventral bristles. 



Anterior femur with 2 or 3 posterodorsal bristles, 1 

 anterodorsal near the apex, 3 long, anteroventral bris- 

 tles on the outer half, besides 5 short, slender, basal 

 bristles. This tibia has 7 anterodorsal bristles, all short, 

 1 anterior and 1 very short anteroventral bristle on the 

 basal third, also dense, ranked setae on the anterior 

 outer half. Anterior tibia also has 3 or 4 posterodorsal 

 distal and 6 posterior bristles and it has 4 short, ventro- 

 basal, and 2 quite long, stout, ventral bristles on the 

 outer sixth. The apex bears a stout, distally attenuate, 

 curved and sharp spine. 



