SYSTEMATIC ACCOUNT. 81 
show that the eggs and spermathece are different. The two forms also 
differ in food habits, since D. transversa breeds chiefly on fungi, this species 
chiefly on fruit. I have bred it from banana, pineapple, tomato, and 
potato. The species is to be found very commonly about tomato plants, 
and is not uncommon about windfall apples. It can be bred in the labor- 
atory on banana, but is not easily kept for many generations, and does not 
breed well in pairs. 
The eggs have three filaments, as shown in plate 1. The chromosomes 
have been described by Metz (1916, Amer. Nat., 50; see p. 39). 
Drosophila transversa Fallén. 1823. Dipt. suec. Geomyz., 2, 6. 
o, 9. Arista with four to six branches above and three below. Antenne yellow, 
third joint darker. Front nearly one-half width of head, wider above; dull yellow. Second 
orbital scarcely one-fourth first. Second oral bristle one-half to three-fourths length of 
first. Carina broad, flat; face dull yellow. Proboscis and palpi yellow. Cheeks yellow; 
their greatest width one-sixth to one-fourth greatest diameter of eyes. Eyes with pale 
pubescence. 
Acrostichal hairs in six rows; no prescutellars. Mesonotum and scutellum yellow, 
slightly shining. Pleurz and legs yellow. Apical and preapical bristles on first and second 
tibiz, preapicals on third. ; 
Abdomen yellow, with four posterior black spots on each of the first four segments, and 
two larger spots on the fifth. 
Both cross-veins clouded, wings otherwise clear. Costal index about 3.5; fourth-vein 
index about 1.8; 5x index about 1.1; 4c index about 0.9. 
Length body 2 mm.; wing 2.2 mm. 
Specimens examined: Hilversum, Holland (J. C. H. de Meijere) ; Machias, 
Maine (C. W. Johnson); Hanover, New Hampshire; Boston (C. W. John- 
son), Chester (C. W. Johnson), New Bedford (C. W. Johnson), Monument 
Beach, Woods Hole, Massachusetts; Niagara Falls (C. W. Johnson), Ithaca 
(S. W. Frost), Staten Island (F. Schrader), Cold Spring Harbor, New York; 
Fort Lee, Riverton (C. W. Johnson), New Jersey; Bloomington, Indiana 
(F. Payne); Flat Rock, Illinois (F. N. Duncan); Plummer’s Island, Mary- 
land (R. C. Shannon); Dead Run (R. C. Shannon), Falls Church (N. 
Banks), Virginia; Athens, Tennessee; Kushla, Alabama. 
This species breeds on various kinds of fleshy fungi, where it is usually 
to be found in great numbers, along with D. putrida Sturtevant. I have 
also bred it from potato, but only with difficulty. 
It is very similar to D. quinaria when pinned, but can usually be dis- 
tinguished by the characters given in the key. It is possible that some of 
the records given above really are based on D. quinaria, but the range is 
certainly a very wide one. Iam certain of some of the records from Massa- 
chusetts, from New Jersey, from Virginia, and from Alabama. The others 
are not in great doubt; in cases where I could not be reasonably sure of the 
identification, as between these species, I have omitted the record. 
This species is so variable as to suggest that we are really dealing with a 
complex group. The specimen from Holland, that on this view is most 
likely Fallén’s D. transversa, has five branches to the arista above, second 
oral three-fourths first, and cheeks one-fourth diameter of eyes. Specimens 
from Monument Beach, Woods Hole, and Ithaca agree well with it. 
The eggs have three filaments (see plate 1). 
Drosophila putrida Sturtevant. 1916. Ann. Ent. Soc. America, 9, 339. 
o', @. Arista with about six branches above and two below. Antennz yellow brown, 
third joint dark reddish-brown. Front nearly one-third width of head, wider above; 
dull yellowish-brown, ocellar dot darker. Second orbital minute. Second oral bristle 
nearly as long as first. Carina low, rather broad, flat; face yellowish brown, somewhat 
