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106 INSECUTOR INSCITI^ MENSTRUUS 



Abdomen compressed, truncate apically, short dark brown 

 terminal setae present ; dorsal vestiture of bronzy black, flat 

 scales, venter with yellowish white somewhat raised scales, 

 colors separated in a straight line. 



Wings longer than abdomen, hyaline, petiole of second 

 marginal cell one-fifth as long as its cell, that of second 

 posterior cell about half as long as its cell. Outstanding scales 

 broadly lanceolate, rounded at tip, many of them obliquely 

 truncate. Basal cross-vein more than its own length from 

 anterior cross-vein. Halteres yellowish with black knobs. 



Legs black, slender, front femora slightly swollen, femora 

 pale brassy beneath. Hind tibia shorter than first hind tarsal 

 joint. Claw formula: 0.0-0.0-0.0. 



Length : body, 4 mm. ; wing, 3.5 mm. 



Male : Proboscis as in female, but clothed beneath with dis- 

 tinctly yellowish-white scales, especially at the base. Palpi 

 short. Antennae similar to those of the female. Coloration of 

 head, thorax, and abdomen as in the female. Abdomen com- 

 pressed, expanded at tip. Apex with long coarse bristles. 

 Long hairs on underside of abdomen, forming a dense fringe 

 laterally. 



Legs dark, front femora pale beneath ; mid legs pale be- 

 neath throughout, hind legs all white beneath. Mid legs with 

 second, third, fourth, and fifth tarsal joints white above. Hind 

 legs with three last joints pale brassy on upper side. 



Claw formula : 0.0-0.0-0.0. 



Body : length, 3.5 mm. ; wing, 3 mm. 



Genitalia : Side pieces spicular, small hairs on inner margins, 

 scaled on inner margins and base, nearly twice as long as wide, 

 the tips concavely tapered, somewhat excavated at tip for in- 

 sertion of clasp filament, an indistinct lobe present, bearing two 

 stout setae and a number of fine hairs. Three long setae in a 

 row below the middle of the side piece. Clasp filament divi- 

 ded, a slender recurved lobe with terminal hook, a large broad 

 lobe with marginal row of coarse teeth and a row of dense, 

 fine hairs, increasing in length along one of the margins; a 

 small leaf-like lobe ; a long moderately broad lobe, with coacse 



