388 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Occurs at Waterbury, in midsummer. This locality is the 

 type locality of the species. 



N. distortus Bassett. 



Female: length 1.5 mm.; mostly black; antennae 13-jointed 

 and similar to those in the male except the third joint, which is 

 shorter, and the color as a whole, which is of a darker shade ; 

 abdomen not petiolate. Male : as long as the female ; mostly 

 shining black and smooth ; antennae 14-jointed, first and second 

 joints combined as long as the third, fourth two-thirds as long 

 as the third, fifth to the twelfth equal in length, all of the joints 

 dusky brown ; thorax rounded, scutel rounded and separated from 

 the mesonotum by a shining groove ; legs clear pale brown, middle 

 of the femora darker but almost transparent and paler at the 

 joints ; wings subhyaline, veins pale clear brown, all distinct and 

 complete and equally developed ; abdomen with a slender petiole, 

 the following segments, seen from the side, forming a rounded 

 disk, the length and breadth of which are about equal. 



The type locality of this species is probably in Connecticut. 

 The galls are to be found on the branches of Quercus bicolor, 

 where the original ones were found 25 May, 1893. 



N. dubius Bassett. 



Female: length 1.5 mm.; mostly black; head with its vertex 

 microscopically sculptured, antennae 14-jointed, first and second 

 joints equal in size, rather large, the third joint one and one- 

 fourth times as long as the first two combined, the fourth about 

 two-thirds as long as the third, the fourteenth with an indistinct 

 suture, the first, second, third and fourth joints pale yellowish 

 red, the rest dusky reddish brown ; thorax rounded, hardly smooth 

 but still shining, with two diverging grooves above extending 

 from the scutel to the bases of the wings, scutel finely and evenly 

 rugose, without foveae, but with a broad groove separating it from 

 the rest of the thorax, the broadest portion of which is in the 

 centre : legs pale yellowish ; wings subfuscous, the veins distinct, 

 radial area open ; abdomen smooth and shining and vertically 

 deeper than long. Male: as long as the female; antennae 15- 

 jointed, the first and second joints rather shorter than in the 

 female, the first dark and shining at its base, the third pale yel- 

 lowish brown and semitranslucent, the remaining joints very 



