No. 22.] HYMENOPTERA OF CONNECTICUT. 421 



only not so distinctly apparent as usual, the median longitudinal 

 line being faintly traceable, as well as the two short lines on the 

 shoulders, scutel rugoso-punctate, cushion-shaped, with two small 

 oblique foveas at base ; abdomen polished, second segment occupy- 

 ing more than one-half the length of the abdomen, third, fourth 

 and fifth segments subequal ; wings hyaline, veins hyaline, so clear 

 as to be traced with difficulty, the radial area open, areolet so 

 pale as to be invisible, except when held up to the light, when it 

 is seen to be distinct, cubitus obsolete. 



The galls of this species in general appearance are exactly 

 similar to those of A. frondosus, but not so large, comprising a 

 cluster of small, deformed, lanceolate leaflets, with from three 

 to five small, smooth, oval cells in its matrix ; these cells are 

 deciduous, measure from 1.5 mm. to a little more than 0.5 mm. in 

 diameter, and like other leafy galls of this kind fall to the ground 

 on reaching maturity. This species is infested by the following 

 parasites: Eurytoma studiosa Say, and a species of each of the 

 following genera: Torymus, Synergus, Ceroptres and Platy- 

 gaster. 



A. seminosus Bassett. 



Female : length , 2.5 mm. ; head black, antennas dark honey- 

 yellow, 1 4- jointed, the first and third equal in length, the fourth 

 to thirteenth thicker than long, the fourteenth longer and conical ; 

 mesonotum black, finely punctate, not hairy, the parapsidal and 

 interparapsidal parallel lines hardly discernible, the dorsal or 

 median lines indistinct, but extending more than half-way to the 

 pronotum, a deep impression over the base of each wing, scutel 

 shining but irregularly and coarsely wrinkled, its shining foveae 

 very deep and separated by a ridge ; legs dark reddish brown, 

 claws simple; wings with veins faint and the areolet subobso- 

 lete ; abdomen black and shining, except the posterior margins of 

 the terminal segments, which are yellowish brown. 



The galls are hard woody knots, sometimes terminating the 

 shoots in a clump of oak sprouts, but oftener an enlargement of 

 the base of the small lateral branches. In some specimens the 

 terminal galls are 25 mm. in diameter and shaped like a straw- 

 berry, others are about half as large and of the same shape; all 

 are more or less uneven on the surface. In old galls the outer 



