112 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 Hves 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 

 c a r y a e 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: 

 termmal 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 3 mm. Antennae extending to the third abdom- 

 mal 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 



