II2 NEW YORK STATE MUSEUM 
inhabited cavity, was reared April 29, 1909 from hickory leaf galls 
taken at Nassau, N. Y., September 16, 1908. This gall appears 
identical with what the late Dr M. T. Thompson of Clark University, 
Worcester, Mass., termed a ‘‘ double decker.’”’ The gall, according 
to his notes, first appears as a brownish, blistered area on the leaf, 
with a slight central point. As the gall develops the epidermis over 
the blistered area is lifted and borne on the top of the deformity 
like a cap. The gall in this stage is hemispherical, with the flat top 
covered by an epithelial plate and is attached by a point on the convex 
under surface. The rim of the gall is then slightly raised, forming 
a low wall around the top area. This rim may continue to grow at 
several points and the developing tissues bend inward till they meet 
and inclose a sort of upper chamber above the real top of the gall. 
The larva lives in the large chamber beneath. The adult issues 
through an irregular hole near and a little to one side of the base. 
Doctor Thompson reared from this gall Clinodiplosis 
caryae Felt, presumably an inquiline, as well as a Caryomyia. 
Gall. Irregularly subglobular, diameter 2 to 3 mm, monothala- 
mous, easily recognized by the more or less complete false chamber 
at the tip of the gall. This sometimes is represented simply by a 
few irregular ridges and in other specimens appears much as though 
the rapidly developing tissues had collapsed owing to some accident. 
The gall is green or brownish and is attached by a slender, short 
stem. 
Exuvium. Length 3 mm, whitish, the antennal sheaths short; 
terminal segment very strongly reduced, conical, the internal basal 
angles slightly chitinized. Cephalic horns rather short, stout. Wing 
and leg cases extending to the third abdominal segment, the dorsum 
of the latter broadly margined with three or four irregular rows 
of stout, chitinous spines and with the intervening space thickly 
covered with chitinous points. 
Female. Length 3mm. Antennae extending to the third abdom- 
inal segment, sparsely haired, pale yellowish orange, the terminal 
segments tinted with carmine; fourteen sessile segments, the fifth 
with a length two and one-half times its diameter; circumfila irregular, 
near the basal third and apically; terminal segment somewhat 
reduced, tapering, narrowly rounded. Palpi; first segment sub- 
quadrate, the second subglobose, the third rectangular, with a 
length more than twice its diameter, the fourth one-half longer, 
somewhat dilated. _Mesonotum shining fuscous yellowish, the 
submedian lines sparsely haired. Scutellum reddish brown, post- 
scutellum deep orange. Abdomen deep red, the segments sparsely 
margined with fuscous hairs; ovipositor yellowish. Wings hyaline, 
rather long, costa light straw. Halteres pale orange. Coxae and 
femora mostly pale yellowish; tibiae slightly fuscous, the tarsi fuscous 
yellowish; claws slender, evenly curved, the pulvilli as long as the 
