No. 22.] HYMENOPTERA OF CONNECTICUT. 407 



opaquely and coarsely rugoso-punctate, with the dorsal groove 

 extending only one-third the way to the scutel and with the 

 parallel carinas on each side of the above groove extending only 

 half-way to the scutel, scutellar foveae large and deep, highly 

 polished and separated only by an acute and high carina; legs, 

 including the coxae, rufous, with the trochanters and tips of the 

 tarsi black ; wings subhyaline, with a dark brown cloud extending 

 from the first transverse vein over the areolet and the radial area 

 to the tip of the wing, veins all brown and distinct, but neither 

 the subcostal, radial, cubital nor anal veins attaining the exterior 

 margin; abdomen with the second joint polished and with some 

 sparse shallow punctures upon the basal three-fourths of the 

 same. The terminal fourth of the second segment except the 

 extreme edge is so densely covered with small confluent punctures 

 as to appear like virgin silver. 



The galls occur on the side of the tuft of the acorns of 

 Quercus rubra and Q. tinctoria. They are globular, smooth and 

 plum-like, intensely bitter, and about 12.5- 19 mm. in diameter, 

 mottled with yellowish and crimson outside, internally yellowish 

 in the centre, and pink toward the circumference. This gall 

 reaches maturity in August and September. 



A. coelebs Osten Sacken. Oak Spindle Gall. 



Male : length 4 mm. ; head and thorax black, opaque, deeply 

 rugose, the latter pubescent; antennae reddish brown, paler 

 toward the tip, 15-jointed; legs mostly ferruginous yellow, pos- 

 terior femora and tibiae infuscate; wings with a brown spot on 

 the second transverse vein, and a pale, almost obsolete, brownish 

 shade between it and the anal angle of the wing, the subcostal and 

 radial veins interrupted before reaching the anterior margin, 

 areolet indistinct, second transverse vein angular. 



The galls of this species occur on the red oak (Querciu rubra), 

 and are elongated, fusiform, pale green, with pedicel inserted 

 on the edge of the leaf and forming the prolongation of a leaf 

 vein. The length of the gall is about 25 mm. 



New Haven, 22 February, 191 1 (B. H. W.). 



A. inanis Osten Sacken. Empty Oak Gall. 



Female : head black, deeply and irregularly sculptured on the 

 front and vertex, face pubescent, rugose; antennas 13-jointed, 



