No. 22.] HYMENOPTERA OF CONNECTICUT. 393 



almost glassy in appearance; abdomen petiolate, triangular in 

 outline, and of a reddish brown. 



The galls of this species are scarcely i mm. long and i mm. 

 wide and i mm. deep. They lie embedded in the lamina of white 

 oak leaves, are pustule-like in form, and oval and apparent on 

 both sides of the leaf, though more distinctly on the upper than 

 on the under side. As many as two hundred of them may be 

 found on a single leaf of ordinary size. Since many of the indi- 

 viduals become infested with parasites, very few of the hosts 

 ever reach maturity. The galls mature about the 25th of June 

 and the imagos hatch out before July loth in Ohio. 



N. affinis Bassett. 



Female : length 2 mm. ; mostly black ; head finely rugose, an- 

 tennae 1 4- jointed and inserted upon a protuberant base, the first 

 joint truncated, the second ovoid, the third one-fourth longer 

 than the first and second combined, the fourth equal to the first 

 two, the fifth to tenth gradually shorter, the remaining four sub- 

 equal, the apical joint pointed; antennae as a whole yellowish 

 brown, especially toward the base, and dusky brown toward the 

 tip : rnesothorax very finely and evenly punctate, parapsidal 

 grooves wanting, scutel punctate and separated from the meso- 

 thorax by a rather broader shining groove; legs shining, almost 

 translucent brown, with a darker shade on the trochanter and on 

 the upper half of the femur ; wings smoky, veins smoky brown, 

 areolet an isosceles triangle with the narrow base on the second 

 transverse vein, cubitus reaching to the first transverse vein, 

 radial area open, but the subcostal vein extending above the base 

 for a short distance, and the anterior border of the wing some- 

 what thickened, which in certain lights causes the radial area to 

 appear closed; abdomen petiolate, black and shining. Male: a 

 little longer than the female; antennae 15- jointed, third joint 

 deeply incised, antennae colored as in the female; legs paler, the 

 femora not at all brown ; abdomen black and shining throughout 

 and with a slender petiole. 



The galls of this species are monothalamous, round, and thin- 

 walled, and occur in the buds of Quercus prinoides, usually partly 

 hidden in the scales of the bud, but in some instances standing 

 out free like a little blister on the twig. They are only large 

 enough to hold the larvae within them, and are dark brown in 



