REPORT OF THE STATE ENTOMOLOGIST I918 IO9 



protruding from the developing socket. The galls become full 

 grown the latter part of August or early in September and drop to 

 the ground, the larvae remaining therein till the following spring. 

 Galls of this species, taken at East SchodackMay 14, 1907, produced 

 adults May 20th. This peculiar gall is common about New York 

 City, the vicinity of Albany, has been received from Michigan and 

 recorded from Ontario and also from Indiana. Polygnotus and 

 Torymus species were reared from this insect. 



Gall. The full-grown gall is a hollow tube 4 to 5 mm long and i 

 mm in diameter (fig. 13, and pi. 8). The apex tapers rather suddenly 

 and varies in color from greenish when young to 

 brownish or even black when fully developed. 

 These galls arise in characteristic sockets or pits. 

 The partly developed galls differ from the full- 

 grown ones mainly in length and are easily recog- 

 nized on account of their resemblance to the more 

 commonly observed form. These galls are occasion- 

 ally abundant enough to produce a curling of the 

 leaf, though as a rule they are somewhat scattering. 



Professor Cook, writing of this gall, states that 

 it is very similar to that of C. holotricha 1S||^ ^' 



except that the amount of tannin is not so great. Ilali 



The upper portion of the wall is much thicker -^if- 



than either side of the lower wall, the point of at- pjg. j^ Cary- 

 tachment is not so large, and the gall is protected omyia tubicola, 

 by a growth, producing a cup-shaped cavity in breastbone of 

 which it develops. The inner layers of cells are ^^^^^ (enlarged, 

 very rich in protoplasm. The cells are elongated 

 with the long axis of the gall and fibrovascular bundles are more 

 numerous than in C. holotricha though very small. 



A more slender, similar appearing, though presumably different 

 gall occurs occasionally on hickory leaves and has been described and 

 figured by B. W. Wells in the Ohio Journal of Science, 16: 53 (fig. 

 27), 1915. This gall is almost invariably slightly curved, tapers to 

 a nearly acute point and the entire interior is hollow. 



Larva. Length 2 mm, stout, white, the head small; antennae 

 small, biarticulate; breastbone (fig. 14) slender, unidentate, the 

 tooth long, triangular, acute. Segmentation rather distinct, the 

 skin nearly smooth, the posterior extremity broadly rounded. 



Male. Length 1.75 mm. Antennae nearly as long as the body, 

 sparsely haired, pale yellowish; fourteen cylindric, subsessile seg- 

 ments, the fifth (fig. 15) with a length about two and one-half 

 times its diameter, a slight constriction at the basal third, the circum- 



