98 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 



Drosophila earlei Sturtevant. 1916. Ann. Ent. Soc. America, 9, 329. 



c^, 9 . Arista with about five branches above and two below. Antennae brown, third 

 joint dark. Front over one-third width of head, wider above; opaque reddish-brown, 

 orbits and triangle grayish pollinose. Second orbital one-third other two. Second oral 

 bristle nearly as long as first. Carina high and narrow; face brown. Cheeks yellowish 

 brown; their greatest width about one-sixth greatest diameter of eyes. Eyes pilose. 



Acrostichal hairs somewhat irregular, in six to eight rows; no prescutellar bristles. 

 Mesonotuni coffee-brown, with yellow-brown markings as follows: a narrow median longi- 

 tudinal streak; a pair of longitudinal stripes including the dorsocentrals, and broader 

 anteriorly with external branches behind; a spot on each humerus. Scutellum coffee- 

 brown, with yellowish lateral edges. Pleurae coffee-brown, legs pale brown. Apical and 

 preapical bristles on first and second tibiae, preapicals on third. 



Abdomen black, four basal segments each with an interrupted yellowish anterior band. 



Wings clear, veins brown. Costal index about 2.0; fourth- vein index about 1.7; 5x 

 index about 1.3; 4c index about 0.9. 



Length body 2 mm.; wing 2 mm. 



Specimens examined: Herradura (C. W. Metz, type material), Cristo 

 (C. W. Metz), Cuba; Panama, Republic of Panama. 



The eggs have two long filaments, that are broadened on their apical 

 halves. The chromosomes, reported by Metz, are described on page 39. 



This species will breed on banana and pineapple. It requires nearly a 

 month for development. 



Drosophila saltans Sturtevant. 1916. Aim. Ent. Soc. America, 9, 328. 



cf, 9. Arista with about five branches above and three below. Antennae brown, 

 third joint darker. Front over one-third width of head, wider above; reddish brown, 

 triangle and orbits grayish pollinose, a brown spot above upper orbital bristle. Second 

 orbital one-fifth other two. Second oral bristle nearly as long as first. Carina high and 

 narrow; face brown. Proboscis brownish. Cheeks yellowish brown; their greatest width 

 scarcely one-sixth greatest diameter of eyes. Eyes with short, sparse pile. 



Acrostichal hairs in six rows; no prescutellars. Mesonotum grayish-brown pollinose, 

 with markings of dark dull-brown as follows: a pair of short longitudinal stripes on the 

 front margin, just within the dorsocentral rows; two pairs of spots just outside the dorso- 

 central rows, one just behind the humeri and the other just behind the transverse suture. 

 Scutellum grayish-brown polUnose. Pleurae dark brown, grayish at the sutures. Legs pale 

 brown, femora and tibiae darker in the middle. Apical and preapical bristles on first and 

 second tibiae, preapicals on third. 



Abdomen dark brown, each segment grayish pollinose anteriorly. 



Wings with a small blackish speck at tip of first vein; otherwise clear. Costal index 

 about 2.0; fourth-vein index about 2.6; 5x index about 1.7; 4c index about 1.4. 



Length body 1.5 mm.; wing 1.7 mm. 



Specimens examined: Guantanamo, Cuba (C. T. Ramsden, type ma- 

 terial). Also specimens from Panama, Republic of Panama, that differ 

 only in having lighter mesonotum. 



This species can be bred for many generations on banana. It has also 

 been bred on pineapple. The larvae have the habit of "skipping," by the 

 same mechanism as the familiar cheese-skipper (Piophila). In this respect 

 they resemble D. cardini Sturtevant, a very different species. 



Drosophila coffeata Williston. 1896. Trans. Ent. Soc. London, 409. 



Arista with about four branches above and three below. Antennae brownish, third joint 

 darker. Front about one-third width of head, wider above; brown, with a pair of velvety 

 black stripes converging below. Only one prominent oral bristle. Carina prominent, 

 sulcate; face brown. Eyes with well-developed pile. 



Acrostichal hairs in eight rows; no prescutellars. Mesonotum brown, with three 

 narrow whitish longitudinal stripes. Scutellum and pleurae dark brown. Legs yellow. 



Abdomen blackish brown. 



Wings very slightly smoky. Costal index about 2.5; fourth-vein index about 1.6; 5x 

 index about 1.2; 4c index about 0.9. 



Length body 1.4 mm.; wing 1.5 mm. 



