86 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 
are very favorable places to collect it, and it is almost certain to appear 
about animal matter that has been preserved in formalin and then allowed 
to become somewhat stale. It will breed freely in such material. It will 
breed in fleshy fungi, but is rarely found about them in the woods. It is, 
in fact, seldom to be found in the woods at all, though quite common about 
houses, barns, or grocery stores. 
Oviposition begins when the females are about three days old, and the 
adults emerge about two weeks after the eggs are laid, at ordinary moderate 
summer temperatures. The species is very easily kept in the laboratory, 
and produces many offspring when kept on banana agar. If it is allowed 
to breed in a culture for several weeks the agar becomes liquefied, which 
it does not do in the case of D. melanogaster. 
Drosophila ordinaria Coquillett. 1904. Proc. Ent. Soc. Wash., 6, 190. 
Q. Arista with about six branches above and two below. Head bright yellow, dark- 
brown ocellar spot. Front over one-third width of head, wider above. Second orbital 
scarcely one-half other two. Only one prominent oral bristle. Carina flat, not sulcate-. 
Cheeks yellow; their greatest width one-fourth greatest diameter of eyes. 
Acrostichal hairs in six rows. Mesonotum, scutellum, pleure, and legs yellow. Apical 
and preapical bristles on first and second tibiz, preapicals on third. 
Abdomen yellow, with an interrupted dark-brown posterior band on each segment. 
Wings clear. Costal index about 2.7; fourth-vein index about 1.4; 5x index about 1.2; 
4c index about 0.8. 
Length body 2.8 mm.; wing 2.8 mm. 
Specimens examined: St. John’s County, Quebec (C. W. Johnson coll.); 
White Mountains, New Hampshire (Morrison, type material); Chester, 
Massachusetts (C. W. Johnson). The species is recorded from New Jersey 
in Smith’s catalogue, but this is probably an error. All New Jersey speci- 
mens so labeled that I have seen are D. transversa Fallén or D. puétrida 
Sturtevant. 
Nothing is known about the habits of this species. I have never seen it 
alive. The male is unknown. 
Drosophila torrei, new species. 
Q. Arista short, with four branches above and two below. Antenne pale yellow. 
Front about one-third width of head; yellowish brown, ocellar dot dark brown. Second 
orbital about one-half first. Second oral less than one-half first. Carina narrow; face 
yellow. Cheeks yellow; their greatest width about one-fifth greatest diameter of eyes. 
Eyes with fine pile. 
Acrostichal hairs in eight rows; no prescutellars. Mesonotum and scutellum dull 
yellow. Legs and pleure pale yellow. All thoracic hairs and bristles are yellowish brown. 
Apical and preapical bristles on first and second tibiz, preapicals on third. 
Abdomen yellow. 
Wings clear, veins yellow. Costal index about 2.0; fourth-vein index about 1.4; 5z 
index about 1.0; 4c index about 1.0. 
Length body 2 mm.; wing 2 mm. 
Type, Havana, Cuba, January-February 1915. This specimen and three 
gonotypes bred from her (1 male, 2 females) are the only specimens seen. 
The male agrees with the above description. These specimens were reared 
on pineapple. 
This species is named for Dr. Carlos de la Torre, whose hospitality at the 
National University in Havana the author was enjoying when the type was 
collected. 
Drosophila duncani Sturtevant. 1918. ‘Bull. Amer. Mus. Nat. Hist., 38, 446. 
Arista with about six branches above and two below. Antenne yellow, third joint 
darker, long, and clothed with long yellow hairs. Front over one-third width of head, 
