266 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Se«. 



black bristles the whole length of the front surface; each femur with a 

 row of stiff hairs below extending its whole length but larger towards the 

 apex ; hind tarsi with the second joint one and a fourth times as long as 

 the first ; tegulae, th«ir dlia and the halteres yellow ; wings tinged with 

 gray; veins brown; costa black; last section of fifth vein about two and a 

 fourth times as long as the cross-vein. 



Described from one female taken by me at Hamburg, N. Y., 

 August 10. Another female taken at the same locality, May 

 14, has the cross-vein twice its length from the wing margin 

 and the face and front more greenish but undoubtedly it be- 

 longs to the same species as the type specimen. I also have a 

 male taken by Mr. Ouellet at Joliette, Quebec, July 13. 



Holotype, female, in collection of the author. 



11. Medeterus distinctus, new species 



Female : Length 2.5 mm. Face rather wide, green, darker and more 

 shining below the suture ; proboscis black, shining, rather small and with 

 3fellow hairs; front opaque with gray pollen; antermae black, third joint 

 rather small, rounded, a little flattened in outline at tip; arista nearly 

 apical ; dorsum of thorax bronze-brown, shining, the gray pollen forming 

 two vittse, one each side of the acrostichal bristles, which unite with the 

 gray of the posterior depressed area, and a less distinct vitta, abbreviated 

 anteriorly, each side above the root of the wdngs ; disc with a fine greenish 

 line between the two rows of strong acrostichal bristles ; bristles above 

 fore coxae small, yellow, appearing brownish in certain lights; scutellum 

 with four bristles, the outer pair about half as large as the central ; pleurae 

 and scutellum green with whitish pollen ; abdomen green, the last two seg- 

 ments more black ; hairs of the abdomen yellow ; coxae and legs black with 

 5'ellow hairs ; knees narrowly yellow ; the yellowish hairs of the fore 

 coxae long and stiff; hind coxae with an erect black bristle; second joint 

 of hind tarsi one and a fourth times as long as the first; tegulae yellow, 

 knob of halteres yellow with a brownish spot on one side; wings slightly 

 tinged with gray; veins brown, yellow at base; third and fourth veins 

 rather closely approximated at their tips; fourth vein ending just before 

 the tip of the wing ; last section of fifth vein a little longer than the cross- 

 vein. 



Described from one female taken by me at East Aurora, 

 Erie County, N. Y., June 25. 



The greenish color of the face and body, less distinct vittae 

 of the mesonotum and the proximity of the tips of the third and 

 fourth veins separate this species from veles Loew. 



Holotype, female, in collection of the author. 



12. Medeterus obscuripennis, new species 



Female : Length 2 mm., of wing the same. Face and front covered with 

 brown pollen ; face below the suture more shining ; antennae black, third 

 joint small, rounded; arista nearly apical; thorax dull green, with gray 



