116 C. H. TYLER TOWNSEND. 



Eyes bare. Antennae nearly as long as face, first joint small, second 

 joint somewhat swollen, third joint extraordinarily widened, trun- 

 cate at tip, subtriangular in outline, the front and apical edges 

 straight, the posterior edge somewhat rounded or convex ; arista 

 rather short, thickened except at tip, distinctly 3-jointed, the first 

 two joints elongate, especially the second. Proboscis short, fleshy, 

 about one-half the hight of head, with well developed labella ; palpi 

 small, slender, hardly thickened at tip. Thorax about as wide as 

 head ; scutellum with an apical pair of macrochsetse and two lateral 

 pairs besides a weak discal pair. Abdomen hardly wider than the 

 thorax, oblong, first segment somewhat shortened ; macrochsetse 

 marginal and discal. Legs of moderate length, sparsely bristly ; 

 claws and pulvilli not elongate in the female. Wings about as long 

 as abdomen, with a pair of small costal spines, third vein without 

 spines, first vein spined at base ; apical cell not completed, fourth 

 vein straight, becoming obsolete before reaching the wing margin, 

 the apical cross-vein therefore absent ; third vein terminating near 

 the tip of the Aving ; posterior cross-vein at about the middle between 

 the small cross-vein and the disappearance of the fourth vein. Type, 

 E. robertsonii n. sp. 



Euryceromyia robertsonii n. sp. 9? — Eyes grayish brown; front, 

 sides of face and cheeks silvery, frontal vitta purplish brown, about one-fourth 

 the width of front, split behind on each side of the ocelli ; ocellar bristles di- 

 rected forward, the front pair strongest, directed also outward ; facial depression 

 silvery, antennae entirely clear rufous, second joint with a bristle on anterior 

 edge, arista dark brown ; proboscis brownish, palpi tlavous, with some short 

 bristles toward tip; occiput silvery, sparsely clothed with black hairs, except 

 black area below vertex fringed with black bristles. Thorax silvery, with four 

 well-developed black vittse ; scutellum silvery. Abdomen shining black, seg- 

 ments two and three broadly silvery on basal portion, anal segment almost 

 wholly silvery ; first segment without macrochtetae, second segment with a lateral 

 pair, and third segment with a median discal pair and a marginal row; anal 

 segment with a discal and marginal row and several lateral subdiscal macrochsetse. 

 Legs black, femora and tibia more or less silvery, bristly; claws and pulvilli not 

 elongate. Wings grayish hyaline; tegulse nearly white, halteres tawny, knob 

 silvery above. Length of body 7.5 mm. ; of wing 6 mm. 



Described from one specimen ; South Illinois (Robertson). 



SIPHOCL,YTIA n. gen. 



Moderately small cinereous species, with abdomen more or less 



rufous on sides or at anus. Belongs in Thryptoeeratinse. Head 



quadrilateral in profile, the occipital longer than the facial profile ; 



front somewhat prominent, about one-third width of head in S , a 



