No. 22.] HYMENOPTERA OF CONNECTICUT. 387 



five times the length of the body. Male: length 1.25 mm.; head 

 broader than the thorax, black and shining ; cheeks with indistinct 

 furrows, antennae 15-jointed, the first joint dark brown, the 

 second lighter, and the remaining ones light yellowish brown, the 

 first and second oblong oval and nearly equal in length, the third 

 slightly longer than both the preceding, club-shaped and curved, 

 but only slightly incised, the remaining joints of uniform length 

 and only a little shorter than the third ; thorax black and shining, 

 finely and evenly sculptured, parapsidal grooves distinct posteri- 

 orly, scutel with a furrow of moderate depth and subobsolete 

 foveae, its surface the same as the mesonotum ; legs light brown, 

 somewhat darker in the middle of the femora and tibiae, claws 

 simple ; wings of moderate size, hyaline, but with a steel-blue 

 cast when seen in certain lights, veins brown fading to colorless 

 lines, areolet wanting ; abdomen black and shining, the second 

 segment almost concealing the remaining ones in the dead speci- 

 mens that have become dry, but in the living insect the terminal 

 ones visible and forming a cone-like termination to the abdomen. 

 The galls of this species occur on the under sides of the leaves 

 of Quercus bicolor and Q. tinctoria. 



*N. consimilis Bassett. 

 Female: length 2 mm.; body mostly black; basal joints of 

 antennae darker than those of the male ; parapsidal grooves want- 

 inng, foveae of the scutel absent but the transverse grooves rather 

 broad and smooth ; posterior legs darker than those of the male ; 

 wings as in the male ; abdomen black, the terminal segments 

 retracted within the first, which is vertically very deep. 

 Male: length 1.5 mm.; head shining black, broader than the 

 thorax, antennae 15-jointed, longer than the body, with the first 

 and second joints short, the second globose, the following ones 

 nearly equal in length, dull dusky brown ; thorax mostly dull 

 black, microscopically punctate; parapsidal grooves reduced to 

 two brief diverging lines, beginning on the scutel ; grooves separ- 

 ating the mesonotum from the scutel broad and shining in the 

 middle ; no distinct foveae present ; posterior legs dark and nearly 

 black except at the joints, middle and anterior legs of a uniform 

 dull yellowish brown; wings hyaline, veins very dark and well 

 defined, radial area open; abdomen black. 



