SYSTEMATIC ACCOUNT. 71 



This species was recorded by Ainslie (1906, Canad. Ent., 38, 44) as bred 

 from the froth of a Clastoptera. As I have previously pointed out, the 

 specimens are now in the U. S. National Museum, and are in reaUty D. 

 inversa Walker. 



Drosophila flexa Loew. 1865. Berlin, ent. Zeit., 9, 182. 



cf, 9 . Arista with four or five branches above and three below. Antennae yellow. 

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

 third other two. Only one prominent oral bristle. Carina low, broad; face yellowish 

 brown. Cheeks yellow; their greatest width about one-sixth greatest diameter of eyes. 

 Eyes with short pile. 



Acrostichal hairs in six rows; prescutellar bristles long, not very stout. Mesonotum 

 and scutellum dull yellowish-brown, with three narrow indistinct yellowish stripes: a 

 median one extending from anterior edge of mesonotum to apex of scutellum, and a pair of 

 lateral ones in the dorsocentral lines. Pleurce brown, yellowish pollinose. Legs yellow. 

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

 hairs brown. 



Abdomen dull brown, each segment darker on posterior margin, and more yellowish 

 on lateral part. 



Wings with a black spot at tip of each longitudinal vein, that on the second being the 

 largest, and a distinct clouding on each cross-vein. Posterior cross-vein distinctly sinuate. 

 Costal index about 3.7; fourth-vein index about 1.3; 5x index about 1.0; 4c index about 0.7. 



Length body 2.5 mm.; wings 2.7 mm. 



Specimens examined: type locality (Gundlach, Loew material), Herra- 

 dura (C. W. Metz), San Luis (C. W. Metz), near Aguada Pasajeros, Cuba; 

 San Marcos, Nicaragua (Baker); Tabernilla, Panama (A. Busck). 



Dr. Metz and I have collectecl this species in Cuba by sweeping. It has 

 not been found about fruit, and we have been unable to get it to breed on 

 fruit in the laboratory, though the adults are quite hardy. 



Drosophila inversa Walker. 1861. Trans. Ent. Soc, 5, 331. 



cf, 9. Arista with three or four short branches above and one or two below. Antennae 

 brown. Front about one-third width of head, wider above; brown. Second orbital about 

 one-half other two. Only one prominent oral bristle. Carina scarcely present; face pale 

 yellow. Cheeks pale yellow; their greatest width about one-sixth greatest diameter of 

 eyes. Eyes with short pile. 



Acrostichal hairs in eight rows; small prescutellars present. Mesonotum and scutellum 

 yellowish brown; pleurae paler. Legs yellow. Apical and preapical bristles on first and 

 second tibiae, preapicals on third. All bristles and hairs brown. 



Abdomen brown, paler in the dorsal region. 



Wings clouded on anterior margin and posterior cross-vein. Posterior cross-vein straight. 

 Costal index about 3.0; fourth-vein index about 1.8; 5x index about 2.0; 4c index about 0.8. 



Length of body 2.5 mm.; wings 2.5 mm. 



Specimens examined: Mount Washington, New Hampshire (Mrs. 

 Slosson); Norwich, Vermont (C. W. Johnson); Gloucester, Beverley, 

 Newton, Massachusetts (C. W. Johnson); Ithaca (S. W. Frost), New York, 

 New York; Avalon, Wildwood, New Jersey (C. W. Johnson); La Fayette, 

 Indiana (J. M. Aldrich); Algonquin, Illinois (D. W. Coquilleti) ; Olmsted 

 County, Minnesota (C. N. Ainslie); Bellingham, Washington (A. L. 

 Melander). Walker gives the type locality as ''U. S." 



The specimens from Minnesota are those reported (as D. sigmoides 

 Loew) by Ainslie (1906, Canad. Ent., 38, 44) as bred from pupse found in 

 Clastoptera froth. This is the only available information on the breeding 

 habits of the species. Like D. nehulosa, Cladochceta nehulosa, and the 

 species of Chymomyza, this species has the habit of frequently spreading its 

 wings. All these species have ornamented wings. 



Note: Since the above was written Baerg (1920, Ent. News, 31:20) has reported 

 this species as living in the spittle masses of Clastoptera obtusa. 



