1915] Van Duzee — Dipterous Genus Thrypiicus • 87 



Described from two males, one taken at Ellis, N. Y,, on June 

 13; and one at Toronto, Ont., July 4. Type in the Cornell Uni- 

 versity collection. 



This species differs from others in having two long slender hairs 

 near the base of the hypopygial lamella, and in the form of the 

 hypopygium. It comes near aurinotatus sp. nov. in the form 

 of the hypopygium and its appendages. 



Thryticus tectus sp. nov. 

 Male: Length 2 mm. Face bright green, narrow; mouth parts black; front 

 violet, shining; frontal bristles black; antennae small black; arista dark brown, 

 pubescent. Thorax and abdomen bright green with yellow hairs and bristles 

 which appear dark brown when viewed from the side; hjT)opygium black, only 

 a little shining, its appendages short and yellow, lamella rounded at tip (Fig. 9). 

 Fore coxae and legs pale yellow, tarsi scarcely infuscated at tips; middle and hind 

 coxae infuscated almost to the tips; fore coxae slightly darkened on the front surface; 

 hind coxae with a slender bristle on the outer side. Halters yellow. Wings with 

 the venation tjT^ical of the genus; tinged with gray; veins brown. 



Described from one male taken at East Aurora, Erie County, 

 N. Y., July 12. Type in the author's collection. 



This comes so near willistoni Wh. that it was with some hesita- 

 tion that I separated it. It looks like that species with the lamellae 

 half concealed, but it also has the appendages at their base well 

 developed, these ajjpendages are not found in willistoni, the 

 lamella is also more hairy. 



Thripticus aurinotatus sp. nov. 

 Male: Length 1.25 mm. Face narrow; front black (opaque in type specimen); 

 antennae and arista brown, densely covered with pale pubescence, the former with 

 the third joint somewhat rounded at tip. Thorax dark green, appearing dark 

 violet when viewed from the front; depressed portion before the scutellum very 

 conspicuous, being deep, well defined and of a golden color when seen from behind. 

 Abdomen dark green; all the hairs and bristles of the thorax and abdomen yellow; 

 hypopygium (Fig. 4) black, appendages pale yellow, lamella large and rather 

 pointed, the inner appendages are also larger than in most species and as long 

 as the lamella. Tegulae, their cilia and the halters pale yellow. Coxae and legs 

 pale yellow with the hairs mostly yellow. Wings grayish hyaline, veins yellowish 

 brown, becoming yellow at the root of the wing; venation about as in T. willia- 

 toni Wh. 



Described from one male from Billy's Island, Okefenokee 

 Swamp, Ga. Taken by Dr. J. C. Bradley in June. Type in the 

 Cornell University collection. 



