424 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BulL 



sidal grooves distinct and a broad deep median line from the 

 pronotum to the scutel, line over the base of each wing present 

 but indistinct, scutel coarsely wrinkled, sparsely hairy, foveae 

 connate, deep, smooth and shiny at the bottonj ; legs with anterior 

 and middle pairs yellowish brown except the trochanter which is 

 nearly black, posterior pairs darker brown; areolet very small 

 and in some cases wanting, radial area open, surface of the wing 

 more hairy than is usual among the Cynipidse. Male: length 2 

 mm. ; black, except the legs and antennae, which are a little darker 

 than in the female. Antennae much longer than in the female, 

 15-jointed, third joint not incised; abdomen small, slender, shiny, 

 the first segment equal in length to all the others. 



The gall of this species is described as being globular, mono- 

 thalamous, on the petioles and leaves of Quercus alba; it is 

 thin-walled, 4 mm. in diameter, green or purplish, and pubescent, 

 sometimes entirely preventing the development of the leaf and 

 appearing on the end of the short petiole. It is sometimes found 

 on the end of a vein of a partially developed leaf, and more 

 rarely surrounded by the lamina of the leaf. In the last case it 

 appears on both sides of the leaf, but is most prominent above. 

 It contains no larval cell. In size and in structure it resembles 

 A. vesicula, found on the same oak, but several weeks later. 

 This species is said to be often quite abundant in a limited space, 

 as in the locality where the author found it. 



A. rcticulatus Bassett. 



Female : length 2.5 mm. ; head and thorax very dark brownish 

 red, approaching black ; antennae 13- jointed, the third joint hardly 

 longer than the two preceding combined, fourth not quite as long 

 as the Ihird, fifth to twelfth subequal, thirteenth one-fourth 

 longer and showing in a favorable light a dark ring near the tip, 

 hardly distinct enough to be called a suture ; mesothorax with an 

 exceedingly fine reticulation and a few short scattered hairs, 

 parallel lines reaching half-way from the pronotum to the scutel, 

 these and the parapsidal grooves and the short lines over the 

 base of the wings present ; scutel pointed, finely rugose, its foveae 

 large, shallow and smooth ; legs light yellowish brown, except 

 the posterior pair which are much darker, claws simple; wings 

 hyaline, veins slender and mostly colorless, areolet present, but 

 indistinct, radial area open; abdomen shining yellowish brown, 



