104 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 



minute. Only one prominent oral bristle. Carina broad and flat; face pale yellow. 

 Cheeks brown; their greatest width aboiit one-sixth greatest diameter of eyes. Palpi 

 yellow, brownish at bjise; with tliree small ajiical bristles. Eyes with short, thick pile. 



Acrostichal hairs in six rows; no prescutellars. Mesonotum velvety black, with a 

 reddish-yellow spot in front, between the dorsocentral rows, a pair of narrow yellowish- 

 gray median stripes, and an irregular grayish mark behind on each side; humeri yellowish. 

 Scutellum dull grayish-black, velvety at base. Pleural blackish brown. Legs brown, 

 femora darker. Apical and preapical bristles on first and second tibia?, preapicals on third. 



Abdomen black, each segment with an interrupted gray basal band. 



Wings with the following blackish areas: one including the basal portion of the wing, 

 up to tip of first vein, and including also most of the area behind the fifth vein (a clear 

 region from middle of first section of costa to apex of anal cell); one on anterior cross- vein; 

 one in marginal cell, just above the last; one, connected with the first area mentioned by 

 an infuscation, including the region of the posterior cross-vein, a U-shaped region with its 

 ends in the costa and its base in the first posterior cell, and a process from this region that 

 includes the apical half of the last section of the fourth vein; one at the tip of third vein. 

 Costal index about 2.1; fourth-vein index about 1.2; 5x index about 0.7; 4c index about 0.7. 



Length body 2.3 mm.; wing 2.5 mm. 



Specimens examined: Havana, Cuba. Schiner described the species 

 from material collected in "South America." 



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



Drosophila calloptera ornatipennis Williston. 1896. Trans. Ent. Soc. London, 407 (as 

 Drosophila ornatipennis, new species). 

 Like D. calloptera Schiner, except as follows: Mesonotum dark brown, pattern yellowish; 

 legs yellow, femora usually brown; no spot in marginal cell above anterior cross-vein. 



Specimens examined: St. Vincent, West Indies (Williston type material). 



This species is figured in Williston's Manual of North American Diptera 

 (1908, p. 300, fig. 5, wing). 



I have given ornatipennis as a synonym of calloptera (1916, Ann. Ent. 

 Soc. America, 9, 327), but a re-examination of the matter has convinced 

 me that Williston's form is deserving of varietal rank. 



Drosophila superba Sturtevant. 1916. Ann. Ent. Soc. America, 9, 342. 



9 . Arista with eight branches above and four below. AntenniB brown, third joint 

 dark. Front about one-third width of head, wider above; yellow. Second orbital scarcely 

 more than a hair. Only one prominent oral bristle. Carina low and narrow, confined to 

 upper part of face; face yellow. Cheeks yellow; their greatest width scarcely one-sixth 

 greatest diameter of eyes. Eyes sparsely clothed with very short, fine pile. 



Acrostichal hairs in about ten rows; no prescutellars; a single pair of dorsocentrals. 

 Mesonotum j^ellow, with two pairs of interrupted brownish longitudinal stripes, the median 

 pair broader than the outer. Scutellum brownish yellow. Pleurae yellow, with two longi- 

 tudinal dark reddish-brown stripes. Legs yellow. Apical and preapical bristles on first 

 and second tibia?, preapicals on third. 



Abdomen dark brown, yellow at base. 



Wings brownish black, with four hyaline areas: one at base; one including the apical 

 part of the costal cell and extending to the anal cell; a band extending directly across the 

 wing about its middle, between the two cross-veins; a spot reaching from the middle of the 

 first posterior cell to the wing-margin in the second posterior cell. Costal index about 3.0; 

 fourth-vein index about 1.2; 5x index about 1.0; 4c index about 0.7. 



Length of body 3 mm.; of wing 3.2 mm. 



Specimen examined: Cacao, Trece Aguas, Alta Vera Paz, Guatemala 

 (Schwarz and Barber). This specimen, in the U. S. Nat. Mus. collection, 

 is the only one known, and is the type of the species. 



Figure 49 shows the strikingly marked wing of this species. 



Drosophila opaca Williston. 1896. Trans. Ent. Soc. London, 411. 



cf , 9 . Arista with about eight branches above and three below. Antennae blackish 

 brown. Front over one-third width of head, wider above; velvety black. Second orbital 



