No. 22.] HYMENOPTERA OF CONNECTICUT. 377 



C. ficus Fitch. Cynips quercus-Hcus Fitch. Synophrus 

 lecviventris Walsh. 



Length 2.5 mm. ; mostly black, but with the lower half of its 

 head, its antennae and legs, pale dull yellow, its hind femora 

 dusky, and its abdomen reddish brown beneath ; antennae in the 

 female 13-jointed, in the male 15-jointed. 



Bred from galls surrounding the twigs of white oak. These 

 galls occur in dense clusters and are packed together so closely 

 as to be faceted where they adjoin each other; furthermore, the 

 individual galls are hollow, bladder-like, and of the pale, dull 

 yellow color of a faded oak leaf. 



Waterbury. 



C. tuber (Fitch). Cynips tuber Fitch. C. quercus-arbos Fitch. 



Length 2 mm. ; mostly black, but with antennae, mouth and 

 legs, dull, pale yellow, hind femora and the antennae towards 

 the tips dusky; male antennae 14- or 15-jointed, female antennae 

 12-jointed. The male with 14-jointed antennae and the female 

 with 12-jointed antennae as described by Fitch are questioned by 

 Bassett as to their belonging to this genus. 



Synergus Hartig. 



S. campanula Osten Sacken. 



Length 2-2.5 mm - (female) ; head black, except the face 

 which is brownish below the antennae and brownish yellow above 

 the mouth, the brownish or yellowish coloring sometimes extend- 

 ing along the eyes to a point above the insertion of the antennae ; 

 vertex black, smooth and shining; antennae brownish yellow, a 

 little shorter than the body, 14-jointed, the fourth joint a little 

 shorter than the third, the following joints subequal in length 

 except the fourteenth or apical joint which is about one and a 

 half times as long as the joint next preceding ; thorax black and 

 but little shining, with dense, delicate, transverse rugae evenly 

 spread over its upper surface, which in addition has a fine scat- 

 tered pubescence, its parapsidal grooves not very deep, but dis- 

 tinct, a vestige of an intermediate furrow visible toward the 

 scutel, two minute parallel glabrous lines running a short distance 

 from the middle of the pronotum backwards ; scutel gibbose, 

 densely rugose, its basal f oveae rather small ; pleurae with a smooth 

 black polished space, the lower part of which is finely aciculate ; 



