No. 22,] HYMENOPTERA OF CONNECTICUT. 383 



ovipositor with a few light colored hairs; on the under side of 

 the abdomen, a little beyond the middle and near to each other, 

 are two bunches of rather long yellowish hairs, and a few very 

 short hairs of the same color are also present on the under side 

 of the abdomen at its base. 



The gall of this species is globular and about 12 mm. in diam- 

 eter; it is covered with numerous conical projections. When 

 fresh it is light green tinged with red. The single cell is in its 

 interior. These galls have been found on the upper side of the 

 leaves of the dwarf chestnut oak (Quercus prinoides) in the 

 latter part of August and early in September. 



Biorhiza Westwood. 

 ''B. (Xystoteras) nigra Fitch. 



Length 2 mm. ; black throughout, including legs and antennae ; 

 entirely wingless. 



*B. hirta Bassett. 



Length 3.5 mm. ; head black, vertex slightly rugose, densely 

 hairy, the same as the entire dorsal surface of the thorax; face 

 pubescent, with its hairs converging toward the mouth ; palpi 

 shining brown, their tips black ; antennae black, 14-jointed ; thorax 

 black, mesothorax not visibly striate, owing to the presence of the 

 pubescence ; legs dull brownish black or very dark reddish brown, 

 posterior pair lightest and all somewhat paler at the articulations 

 than elsewhere; wings represented by mere yellowish white 

 scales; abdomen black and shining, with a short, closely bunched 

 pubescence on each side of the second segment, the second seg- 

 ment as well as the remaining segments, except the first, bounded 

 across the back and sides along the posterior edge by a belt of 

 long silvery white hairs. These belts are divided on the dorsal 

 ridge by a shining glabrous line like the anterior portion ©f the 

 segment ; furthermore, they are visible to the naked eye. 



The galls of this species are hard and round and approxi- 

 mately 6 mm. in diameter, their surface is finely papillose, and 

 their substance has a solid radiated cellular, structure ; they are 

 to be found growing sometimes on the upper but as often on the 

 under side of the leaves of Quercus ilicifolia, and are attached to 

 the larger veins by a very short pedicel. 



