NORTH AMERICAN DIPTERA. 119 



spined as fur as small cross-vein ; apical cell ending in tip of win"-, 

 narrowly open ; fourth vein only gently curved, apical cross-vein 

 slightly concave; hind cross-vein straight, perpendicular to fourth 

 vein, a little nearer to curve of fourth vein than to small cross-vein. 

 Type, G. acrirostris n. sp. 



This form might at first sight be taken for a Thryptocera, hut it is 

 very readily distinguished from that genus by the slender and sharp 

 proboscis. 



Oiiiglyinia acrirostris n. sp. -J, ?— Eyes dark brown; front cinereous, 

 frontal vitta black, very narrow, widening behind on each side of the ocelli: 

 face, sides of face and cheeks silvery, epistoma with a pale yellowish tinge: an- 

 tennae nearly black, second joint with a short bristle on front edge, arista black : 

 proboscis grayish at base, remaining portion dark brown : palpi pale brownish 

 yellow, darker and with short bristles at tip; occiput ciuereons. with some short 

 black bristles above and a fringe of black bristles on border. Thorax cinereous, 

 with four narrow blackish vitta; interrupted at suture; scutellum cinereous. 

 Abdomen dark brownish, bases of second to fourth .segments narrowly silvery, 

 sides of first and second segments and anterior lateral portion of third segment 

 pale brownish yellow, first segment without macrochietffi, second segment with a 

 lateral and a median marginal pair; third segment with eight or ten marginal, 

 and anal segment with six or eight marginal macrochsetje ; venler pale pearly 

 yellowish, dark brown toward anus; hypopygium dark brown. Legs pale brown- 

 ish yellow, the tarsi blackish, femora slightly silvery ; claws and pul villi short. 

 Wings grayish hyaline, almost imperceptibly smoky; tegulje pale yellowish 

 white, halteres pale yellow. Length of body 4.5 mm. ; of wing 3.5 mm. 



Described from one specimen ; Constantine, Mich., August 2;;d. 



EIILASIOIVA n. gen. 

 Medium sized, very bristly and hairy, blackish species. Belongs 

 in Thryptoceratinse. Head rather triangular in profile, the front 

 very sloping, the oral profile rounded ; front somewhat prominent, 

 extremely narrow posteriorly in % , the eyes closely approximated, 

 wide and triangular before, face rapidly widened, fully three-fourths 

 width of head ; fronttd bristles all nearly equal, not strong, all directed 

 more or less forward, absent just before vertex, descending in a more 

 or less irregular double row on sides of face as low as lower border 

 of eyes; no orbital bristles in S . Face well receding, epistoma not 

 prominent ; facial depression two-thirds width of face, quite trian- 

 gular in outline, widest below, shallow ; fticial ridges bare, except a 

 few bristles above vibrisste not extending half way up, constricted 

 below ; sides of face of moderate width ; cheeks rather wide, about 

 one-third eye-hight, hairy, with some bristles on lower border ; vi- 

 brisste moderately strong, decussate, inserted on oral margin. Eyes 



TK.4.NS. AM. ENT. SOC. XIX. MAY, 1892. 



