BUFFALO SOCIETY OF NATURAL SCIENCES 173 



10 Diaphorus gibbosus n. sp. 



Male : Length 3 mm. Face, palpi and proboscis black ; 

 face with gray pollen ; antennae small, black, third joint very 

 small ; arista dorsal ; eyes contiguous, leaving only a very small 

 black triangle above the antennae ; occalii not so prominent as 

 in most species that have the eyes contiguous ; cilia of the interior 

 orbit dark brown. Dorsum of the thorax prominently elevated 

 and including the scutellum dark green, somewhat shining ; in 

 front and along the lateral sides more blackish and opaque be- 

 ing covered with thick brown pollen, which in most specimens 

 forms two indistinct vittae on the front of the dorsum ; pleurae 

 black with dark brown pollen. Abdomen dark brown or black, 

 almost opaque still with slight greenish reflections, and with quite 

 abundant, rather long brown hairs ; bristles ,at the tip of the 

 abdomen not very long but prominent ; appendages of the hypo- 

 pygium very small, black. Halters black ; tegulae brown with 

 narrow black border and black cilia. Coxae and femora black ; 

 tibiae and first joint of tarsi yellowish brown, tarsi from the tip 

 of the first joint darker; pulvilli of the fore tarsi moderately en- 

 larged, those of the middle tarsi less so, and those of the hind 

 tarsi scarcely enlarged ; fore femora with long hairs on the lower 

 outer edge, these hairs as long as the thickness of the femora ; 

 middle and hind femora with hairs similarly placed but the hairs 

 are much shorter on the basal half ; all tibiae with long hair but 

 without bristles except a small slender one on the middle and 

 hind pair near the knee and several very minute ones on the 

 hind pair. Wings strongly tinged with brownish; first vein 

 reaches about half way to the tip of the second vein ; veins 

 black ; costa somewhat enlarged from just before the tip of 

 the first vein to the tip of the second vein or beyond. 



Described from twelve males ; two taken at Little Valley, 

 X. Y., June 10th ; three from Colden, N. Y., May 31st; one from 

 Ft. Erie, Ont., June 20th, this one has the thorax more purple 

 than green ; one from Castle Rock, Pa., May 21st, and one 

 marked "June," sent by E. T. Cresson, Jr. ; two from Auburn- 

 dale, Mass., July 12th and June 4th, one from Manchester, Vt, 

 June 8th, and one from Johnsbury, Vt., June 27th, sent by C. 

 W. Johnson; one from Monmouth, Me., June 27th (C. A. Frost). 

 Type in the author's collection. 



