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. 8S. National Museum, and are in reality D. 
inversa Walker. 
Drosophila flexa Loew. 1865. Berlin. ent. Zeit., 9, 182. 
o, 2. Arista with four or five branches above and three below. Antenne 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. Pleurze brown, yellowish pollinose. Legs yellow. 
Apical and preapical bristles on first and second tibix, 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 collected 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. 
o', 2. Arista with three or four short branches above and one or two below. Antennz 
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; pleure paler. Legs yellow. Apical and preapical bristles on first and 
second tibiz, 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; 5z 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. Coquillett); 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 pupz found in 
Clastoptera froth. This is the only available information on the breeding 
habits of the species. Like D. nebulosa, Cladocheta nebulosa, 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. 
