No. 22.] HYMENOPTERA OF CONNECTICUT. 425 



lightest anteriorly, second segment so long and deep as to nearly 

 conceal the remaining segments. 



The galls of this species are polythalamous, and occur on the 

 midvein of what is probably one of the dwarf varieties of Quercus 

 virens. The galls are prominent on both surfaces, but more so 

 on the under side, are almost round and (dried specimens) 6 mm. 

 in diameter. The dry galls are exceedingly hard, and bear a very 

 close resemblance to those of A. cicatricula, though the scar or 

 indentation invariably found in that species is wanting. The larval 

 cells are not separable from the solid woody fibre around them, 

 and they all radiate from a common centre. 



A. capsulus Bassett. Oak Capsule Gall. 



Female : length 2.5 mm. ; deep shining black, with the excep- 

 tion of the antennae, legs, and sheath of the ovipositor ; head and 

 thorax microscopically punctate and sparsely dotted with ex- 

 tremely fine short hairs, parapsidal grooves converging as they 

 approach the scutel, a slight groove over the base of the wings, 

 the short parallel lines represented by a very slight depression 

 on each side of the rather prominent dorsal ridge, but these last 

 so obscure as to easily escape notice, the scutel wrinkled rather 

 tham punctate and without foveae; antennae 13- jointed, first and 

 second joints rugose, thirteenth as long as the eleventh and 

 twelfth together and with a connate suture, amber colored, in- 

 clining to brown ; coxae and trochanters black or blackish brown, 

 femora and tibiae clear shining dark brown, paler at the joints, 

 tarsi pale cinnamon brown, claws black; wings hyaline, veins 

 pale brown, fading in the smaller ones to hyaline, areolet indis- 

 tinct, radial area open ; abdomen with its first segment equal in 

 length to all the others taken together, the sheath of the ovipositor 

 dark translucent brown, and not turned up at its extremity. Male : 

 smaller, darker, and with a laterally compressed abdomen. 



The galls are monothalamous, on slender pedicels on- the 

 margins of the leaves of Quercus bicolor, rarely more than one 

 on a leaf, the pedicels from 12.5 to 18 mm. long; the galls them- 

 selves are 9 mm. long and 3 mm. in diameter, oval, and resemble 

 very closely the capsules of certain mosses ; the surface is rough, 

 and with the pedicel finely pilose or rather pubescent ; the pedicel 

 is usually but not invariably the extension of a lateral leaf vein; 

 the whole is of the color of the under side of the leaves of this 



