REPORT OF THE STATE ENTOMOLOGIST 1918 231 
The larvae appear to desert the gall in the fall, the adults issuing 
the following spring and presumably ovipositing upon the develop- 
ing leaves. This gall has been recorded by Walsh as rather abundant, 
though local, on the leaves of Salix humilis near Rock Island, 
Ill. A smaller gall, apparently the same, was also found by Walsh 
on the foiage of S. discolor. ; 
Gall. The gall (pl. 12, fig. 1) is a very characteristic subconic 
enlargement arising in clusters from the midrib or some of the prin- 
cipal veins of the leaf. The gall is about 2 mm in diameter, greenish 
yellow, monothalamous, subglobular and tapering to a truncate, 
frequently lipped, free extremity. The presence of the gall on the 
upper surface of the leaf is indicated by a small point or nipple. 
Larva. Length 1.5 mm, orange colored, the breastbone small and 
indistinct. 
Female. Length 2.5 mm. Antennae extending to the second 
abdominal segment, sparsely haired, pale yellowish orange; fourteen 
segments, the fifth subsessile, a very short stem, the basal enlarge- 
ment cylindric, with a length over twice its diameter; low circumfila 
occur near the basal third and subapically; terminal segment slightly 
reduced, tapering, broadly rounded. Palpi; the first segment with 
a length more than twice its diameter, rectangular, the second 
broadly oval, with a length one-half greater than its diameter. 
Mesonotum dark brown, the submedian lines thickly haired. Scu- 
tellum reddish brown, postscutellum reddish. Abdomen dark red, 
sparsely haired; ovipositor fuscous yellowish. Wings hyaline, 
rather narrow; costa dark brown, the third vein just before the apex. 
Halteres fuscous yellowish, fuscous subapically. Coxae, femora and 
tibiae fuscous yellowish, the tarsi darker, almost black; claws rather 
short, stout, strongly curved, the pulvilli distinctly longer than the 
claws. Ovipositor about one-third the length of the abdomen, 
rather stout, the terminal lobes long, stout, narrowly and irregularly 
oval. Type Cecid. a1785. 
ODONTODIPLOsIS Felt 
1908 Felt, E. P. N. Y. State Mus. Bul. 124, p. 404 
1910 Rubsaamen, E.H. Zeitsch. Wissenschaft. Insektenbiol., 15: 287 
1911 Felt, E.P. N. Y. Ent. Soc. Jour., 19:61 
1913 Kieffer, J. J. Gen. Insect., fasc. 152, p. 203 
This genus is erected for the separation of certain species allied to 
Cecidomyia, which may be distinguished therefrom by the triarticu- 
late palpi and the conspicuous serrations on the somewhat conical 
ventral plate or harpes. Type Cecidomyia karner- 
ensis Felt. 
Key to Species 
a Fifth antennal segment having the basal portion of the stem with a length 
about one-half greater than its diameter 
b Length .75 mm; abdomen reddish yellow......-.-- sos sig lele dhiofelee sldiews 
karnerensis Felt, C. 27 
