136 ENTOMOLOGICAL SOCIETY 



Hyalomyia aldrichii nov. sp. 



Male Black. Byes brown, closely approximated in front of the ocelli, 

 thus very much narrowing the front at this point ; vitta nearly or quite 

 obsolete, only showing as a triangle at base of antennae, brownish or 

 nearly black ; sides of front silvery, extending to the vertex as a silvery 

 vitta, with a row of fine black bristles on each side ; face and ocellar 

 borders black, cinereous pollinose ; antennae black, slightly cinereous ; 

 proboscis black ; palpi blackish, thread-like, very slightly or scarcely at 

 all enlarged at the tip ; cheeks black, silvery pollinose, gray hairy ; occi 

 put black, black hairy on upper border, silvery pollinose on sides and 

 below. Thorax and scutellum shining black, of a metallic, very dark 

 greenish luster, with black bristles on the sides and behind ; shoulders 

 and pleurae coucolorous, very slightly, almost imperceptibly, cinereous. 

 Abdomen black, metallic, with a median interrupted, or almost obsolete, 

 black line ; first segment shining, with a dark greenish reflection, clothed 

 with short black hair ; remaining segments cinereous pollinose, with 

 scattered black "hairs, each arising from a black dot ; venter concolorous, 

 anal half more or less cinereous. Legs black, black hairy, especially at 

 enlarged femora ; pulvilli whitish. Claws black, rather elongate. Wings 

 hyaline, slightly yellowish at base ; tegulae nearly pure white, hind scale 

 faintly grayish ; halteres slightly yellowish, more or less dusky. 



Female Differs from the male in having the eyes still more closely 

 approximated, almost contiguous, and the claws very short. The frontal 

 vitta is more distinct, and continued to the vertex as a narrow line. The 

 shoulders and pleurae also are more cinereous. The anal or fifth 'seg 

 ment, present in the <j\ is wanting. 



Length of body, 3 to 3^ mm. ; of wing, 3 mm., or slightly more. 



Described from 2 9 and 2 $ specimens. Brookings, South 

 Dakota. From Mr. J. M. Aldrich. A third $ from the same 

 locality differs in being smaller and much narrower, but is 

 probably the same species. 



Hyalomyia robertsonii n. sp. 



Female Byes almost contiguous in front of the ocelli ; front cin 

 ereous, bristly on each side of the black vitta, which is widened towards 

 the antennae ; antennae black, third joint cinereous ; face and cheeks 

 cinereous, the latter with fine whitish hairs ; proboscis blackish, palpi 

 rather short, slender, not enlarged at tip, tawny, blackish at base ; occi 

 put cinereous, with short black hairs, becoming whitish below ; vertex 

 with a posterior pair of bristles directed backward, one at each vertical 

 angle, and an anterior pair situated between the three ocelli, directed for 

 ward. Thorax black above, cinereous on the sides, with black bristles 

 on the sides before the wings, and on the posterior part of the dorsum ; 

 scutellum black, with four black bristles. Abdomen slightly cinereous, 



