88 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 



ment with Mr. Johnson as to this identification. The specimen lacks the 

 third antennal joints on each side, so the above description is drawn in 

 part from Williston's description, which was based on four specimens from 

 the ishmd of St. Vincent. 



Drosophila pulchella Sturtevant. 1916. Ann. Ent. Soc. America, 9, 327. 



D. bcllula Williston. 1896. Trans. Ent. Soc. London, p. 410 (not Bergroth. 1894. Ent. 

 Zeit. Stettin 55). 



cf, 9 . Arista with about five branches above and two below. Antennae yellow, 

 third joint darker. Front yellowish brown. Second orbital one-fourth other two. Sec- 

 ond oral nearly as large as first. Carina short, rather narrow, flat. Face and cheeks 

 yellow. 



Acrostichal hairs in six rows; no prescutellars. Mesonotum dark reddish-brown, with 

 three indistinct yellowish stripes. Scutellum brown, with yellow margin. Pleurae brown. 

 Legs yellowish brown. 



Abdomen yellow, each segment with a posterior dark-brown band that is broader in 

 the mid-dorsal region. 



Wings clear. Costal index about 2.0; fourth-vein index about 1,9; 5x index about 1.6; 

 4c index about 1.4. 



Length body 2.2 mm.; wing 2.3 mm. 



Specimens examined: St. Vincent, sea-level (Williston type material); 

 Montserrat, Trinidad, West Indies (A. Busck). 



Drosophila nebulosa Sturtevant. 1916. Ann. Ent. Soc. America, 9, 327. 



D. limbata Williston. 1896. Trans. Ent. Soc. London, p. 414 (not van Roser. 1840. 

 Wiirtt. Corrbl.). 



cf , 9 . Arista with about six long branches above and three below. Antennae yellow, 

 third joint brownish. Front over one-third width of head, wider above; reddish yellow. 

 Second orbital one-half other two. Second oral three-fourths first. Carina well developed, 

 flat, very slightly indented; face j^ellow. Cheeks yellow; their greatest width about one- 

 fifth greatest diameter of eyes. Eyes with rather short, thick pile. 



Acrostichal hairs in six rows, somewhat irregular; no prescutellars. Mesonotum and 

 scutellum dull yellow. Pleurae and legs pale yellow. Apical and preapical bristles on 

 first and second tibiae, preapicals on third. 



Abdomen yellow, each segment with a broad black posterior band which is thickened 

 in the mid-dorsal line. 



Wings smoky, darker along posterior cross-vein and on anterior half. Costal index about 

 2.4; fourth-vein index about 2.1; 5x index about 1.6; 4c index about 1.1. 



Length body 2 mm.; wing 2.2 mm. 



The species was described by Williston from the island of St. Vincent. 

 I have not seen any of the tj^pe material, but have little doubt of the correct- 

 ness of the determination. The form here described has no combs on the 

 male front tarsi ; but there are in the United States National Museum some 

 specimens, bred from Tonka bean pods from Venezuela, in which such 

 combs are present. Otherwise this form agrees fairly well with the descrip- 

 tion given above. However, to judge from the distribution, there seems 

 little reason to doubt that Williston had the form without sex-combs 

 described above. 



Specimens examined: Herradura (C. W. Metz), Havana, Santiago de las 

 Vegas, Cayamas (E. A. Schwarz), Cristo (C. W. Metz), Guantanamo (C. T. 

 Ramsden), Cuba; Sanchez, Haiti (F. E. Watson); Manati, San Juan, 

 Porto Rico (Lutz and Mutchler) ; Bay Mansion, Barbados (H. A. Ballou) ; 

 Panama, Republic of Panama. Described from St. Vincent. 



This species is common about fruit in Cuba. It breeds freely in the 

 laboratory on slightly fermented banana, and has been reared from pine- 

 apple and from guava. About twelve days are required for its development 

 from egg to adult. The eggs have two filaments. 



