NORTH AMKRIOAN DIPTEKA. 123 



ridges bare, except a few bristles tibove vibrissjc, well constricted 

 below ; sides of face wide, with a row of hairs near orbital margin ; 

 cheeks about two-thirds hight of eyes, bare before, hairy posteriorly, 

 with bristles on lower margin ; vibrissa not strong, inserted but little 

 above oral margin. Eyes l)are, descending three-fifths as low as oral 

 margin. Anteume much shorter than face, second joint hardly 

 elongate, third about one and one-half times as long as second, more 

 or less rounded ; arista moderately long, microscopically pubescent 

 on basal half, thickened basally, ^j-jointed, second joint short. Pro- 

 boscis hardly as long as hight of head, moderately stout, labella 

 large; i)alpi moderately slender, hardly thickened at tip. Thorax 

 not wider than head ; scutelliim with a strongly decussate apical ])air 

 of macrocluetfB reaching nearly to base of third abdominal segment, 

 three lateral and one discal pair. Abdomen wider thaji thorax, 

 elongate round, flattened, first segment hardly shortened ; maero- 

 chsetfe only marginal. Legs of moderate size and length, bristly ; 

 claws and pulvilli of 9 a little elongate. Wings very much longer 

 than abdomen, with very small costal spine, third vein somewhat 

 bristly at base; apical cell closed in margin, or extremely short 

 petiolate, terminating a little before tip of wing; fourth vein bent 

 at obtuse angle, with a slight wrinkle at bend, apical cross-vein 

 bowed in ; hind cross-vein more or less curved, oblique, nearer to 

 bend of fourth vein. Type, S. dakotensis n. sp. 



Sarcoclista dakotensisi n. sp. 9-— Eyes brown ; frontal vitta hhickish ; 

 sides of front, face and cheeks cinereous with a sliiiiit brassy reflection, tlie area 

 l)etween sides of face and cheeks light brown : anterior pair of ocellar bristles 

 strongest, directed forward and outward ; antenna; reddish brown, tliird joint 

 brownish, arista brownish black ; proboscis blackish, labella brown, paljii yel- 

 lowish brown; occiput cinereous, sparsely black hairy, fi'inged with black hairs 

 on orbital margins. Thorax grayish cinereous, with three black- %'ittje reaching 

 nearly to scutellutn ; scutelluni cinereous. Abdomen almost entirely cinereous, 

 clothed with black hairs; first and second segments with a lateral pair of m:ic- 

 rochtetie, .second segment also with a median marginal pair, third and anal seg- 

 ments each with about eight marginal macrochsetre, those on anal segment .set 

 more closely together. Legs blackish, femora somewhat cinereous on outside, 

 femora and tibise bristly; pulvilli fuscous. Wings grayish, teguhe whitish, 

 halteres more or less dusky. liCngth of body fi mm. ; of wing r>.^ mm. 



Described from one spei-imen ; ]>rookings, S. Dak. (J. M. .VIdrirh.) 



ErKC'OI>OI.I.4 n. gen. 

 Moderately small, shining black species. Belongs in Phvtoinav 

 Head nearly hemispherical in profile; front rouniled, not prominent, 



TRANS. .\M. ENT. SOC. XIX. MAY, lSfl.2. 



