332 Annals Entomological Society of America [Vol. IX, 



Cold Spring Harbor, Long Island, and Ithaca, N. Y., Cabin 

 John Bridge, Md., Falls Church, Va. and Helena, Ark. 



The females agree with the description given above; but 

 both sexes vary somewhat in the color of the thorax, and many 

 specirhens have the posterior cross-vein distinctly clouded. 



Drosophila robusta is a fruit eating form, living on banana 

 in the laboratory. I have specimens bred from potato in 

 Massachusetts. 



This species resembles D. virilis, n. sp. and D. melanica, n. sp. 

 Its oral and palpal bristles and narrow cheeks will separate 

 it from the former. It differs from D. melanica in its larger 

 size, black fore coxae, and darker abdomen. 



Drosophila melanica, n. sp. 



cf. Arista with four branches above and two below. Antennae 

 dark brown, second joint grayish above. Front over one-third width 

 of head, wider above; blackish, velvety, orbits and narrow triangle 

 brown. Second orbital about one-third size of other two. Second 

 oral bristle less than one-fourth vibrissa. Carina broad, slightly 

 sulcate. Face blackish brown, dull. Several prominent palpal bristles. 

 Cheeks brown; their greatest width about one-sixth greatest diameter 

 of eyes. Eyes with short thick black pile. 



Acrostichal hairs long, in six rows; no prescutellar bristles. Dorsum 

 of thorax dull blackish brown, a small indistinct pair of brown spots 

 on anterior margin, just inside of dorsocentral lines. Htuneri grayish 

 brown. Scutellum and pleurae dark dull blackish brown. Legs, 

 including coxae, pale brown. Apicals and preapicals on first and 

 second tibiae, preapicals on third. 



Abdomen yellow, with a pair of lateral dark brown fascise on each 

 segment. 



Wings clear, veins brown. Costal index about 3.8; 4th vein index 

 about L4; 5x index about 1.0; 4c index about O.S. 



Length of body 2mm., wings 2>^mm. 



Type, allotype and numerous gonotypes, bred at New York, 

 N. Y., from stock collected at Kushla, Alabama, April, 1915. 

 I have examined specimens from Woods Hole and Plymouth, 

 Mass.; Macon, Ga. ; St. Louis, Mo.; Kingston, R. I.; Plummer's 

 Island and vicinity, Md.; Dead Run, Va. ; North Carolina; 

 Mt. Washington, N. H.; Helena, Ark. 



Typical females agree with the above description. Some 

 specimens of both sexes, especially the northern ones, are 

 somewhat lighter in color; but this is perhaps an accidental 

 age difference. 



