No. 22.] HYMENOPTERA OF CONNECTICUT. 429 



in certain lights to be seen lying between the parapsidal grooves 

 and the median line or longitudinal depression, a deep groove 

 over the dorsulum near the insertion of the wings, scutel regu- 

 larly sculptured, without basal tips ; legs shining, yellowish brown, 

 middle of the femur and tibia darker than the same joints at 

 their articulations with each other, tips of tarsi black; wings 

 hyaline, first transverse and radial veins dark brown, the other 

 veins pale but distinct, areolet present at the base of the open 

 radial area. Male: very like the female in color and markings, 

 but the antennas are mostly amber color, except the terminal 

 joints, which are light brown. As a rule the antennae are 

 i6-jointed. 



The galls of this species grow upon the green twigs of Quer- 

 cus tinctoria, sometimes causing simply an enlargement of the 

 part affected, again entirely checking the growth of the affected 

 part and being covered with leaves. These galls are from i8 to 

 37 mm. long and rather more than 12 mm. in diameter at the base ; 

 they are woody, tuber-like, and taper to a point. 



The type locality of this species is Waterbury. 



A. (C.) operator Osten Sacken. 



Female: head yellowish red, especially beneath, antennae 12- 

 jointed, the joints beyond the third subequal, the third joint the 

 longest, except the apical joint, which is a little longer than the 

 third and seemingly partially subdivided into three joints ; thorax 

 reddish, indistinctly sculptured, parapsidal grooves extending 

 from the pronotum to the scutel, these grooves delicately im- 

 pressed but still distinct, in addition on the dorsulum four grooves 

 as follows : one on each side between the preceding and the bases 

 of the wings, and indications of one on each side between the 

 parapsidal grooves and running from the pronotum to the middle 

 of the dorsulum ; scutel roughened and provided with basal pits ; 

 legs pale reddish, except the claws, hind tibiae, and the bases of 

 the hind tarsi, all of which are brown; wings hyaline, quite 

 transparent, areolet wanting, subcostal, first and second trans- 

 verse veins distinct and pale yellowish, the terminal portion of 

 the subcostal vein wanting, the radial vein and end of cubitus 

 pale and indistinct, that portion of the cubitus which usually 

 extends from the first to the second transverse vein entirely 

 wanting in this species, anal vein nearly obsolete. Male : differ- 



