82 THE CANADIAN ENTOMOLOGIST. 



become obsolete about halfway between sucure and scutellum, and a heavier 

 lateral vitta which is interrupted at suture ; scutellum brassy pollinose. 

 Abdomen shining black, bases of second to anal segments broadly silvery 

 pollinose with a brassy tinge, also sides of first segment ; first segment with 

 a lateral macrochseta and bristles, and a median marginal pair; second 

 with a lateral one, and a median marginal and discal pair ; third with a 

 median discal pair and a marginal row of about eight ; anal segment with 

 a discal and marginal row 1-egs black, tibiae rufous, bristly, femora 

 silvery on outside, claws and pulvilli quite elongate, pulvilli yellowish. 

 Wings grayish hyaline, tegulge whitish, halteres yellowish. 



Length of body, Sj4 mm.; of wmg, 7 mm. 



Described from one specimen ; Penna. (C. \V. Johnson). 



Polidea americana, n sp., ^ . 



Eyes nearly black, pubescent; frontal vitta back, one-third width of 

 front, front one-third width of head ; one orbital bristle on left side, none 

 on right ; frontal bristles descending below base of third antennal joint ; 

 sides of front shining dark green as far down as lowest frontal bristles ; 

 sides of face and facial depression silvery-poUinose ; cheeks and occiput 

 shining dark green ; antennae and arista deep black, third antennal joint 

 wide, two and a half times as long as second ; proboscis brownish, palpi 

 pale rufous, darker at base. Thorax, scutellum and abdomen dark 

 metallic green ; first segment with a lateral marginal macrochpeta 

 amongst other bristles ; second with a median discal and marginal pair, and 

 a lateral marginal and discal one, or pair ; third with a median discal and 

 lateral discal pair, and a marginal row ; anal with a discal and marginal 

 row ; hypopygium somewhat brownish. Legs black, knees hardly rufous, 

 claws and pulvilli only a little elongate. Wings slightly grayish, nearly 

 hyaline, veins yellow, third vein spined nearly or greater way to small 

 cross-vein ; tegulse nearly white ; halteres rufous, knobs black. 



$ . Diff"ers as follows : — Frontal v/idth about the same, two orbital 

 bristles (only one on right side in one specimen) ; third antennal joint 

 not widened. Claws and pulvilli not quite so long ; front tarsal joints 

 widened. 



Length of body, cj 6 mm., $ 5/'2 to 5; 3 mm.; of wing, ^ 4 mm., 

 ^ 4j/^ to 43^ mm. 



Described from one male and two females; Constantine, Mich., 

 August 34. I have also a ^ from Orono, Maine (Harvey), which I 

 doubtfully refer to this species. It has no orbital bristles, and the apical 

 cell is very narrowly open. It measures 5 V3 mm. 



