390 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 



[Bull. 



thirds as long as the third, the following joints except the thir- 

 teenth subequal in length ; thorax black and smooth, parapsidal 

 grooves wanting, scutel rounded, polished, and separated from the 

 mesothorax by a broad arcuate groove ; legs pale translucent brown 

 at the joints, changing to an almost polished black in the middle 

 of the femora and tibiae; wings hyaline, veins dark and distinct, 

 radial area open ; abdomen black and forming in outline an equi- 

 lateral triangle. Male: head shining black; antennae 14-jointed, 

 the third joint one-third longer than the first and second com- 

 bined, the fourth equal to the first and second together, fifth to 

 thirteenth joints equal in length, the antennae as a whole of a 

 clearer, more shining brown than in the female ; thorax and abdo- 

 men concolorous with the head. 



Type locality: Waterbury, 29 April, 1874. Found ovipositing 

 in the buds of a low spreading bush of Quercus prinoides. 



N. umbilicatus Bassett. Oak Button Gall. 



Length 1,5 mm. ; antennae with the second joint as thick as the 

 first but a little shorter and less tapering toward the base, the third 

 as long as the first and second combined, the fourth to thirteenth 

 subequal, the last three forming a thickened club with obscure 

 articulations ; thorax polished, hairless or seemingly so, and with- 

 out grooves, scutellar f oveae wanting ; legs rather translucent dark 

 and shining brown, in some individuals nearly black, always 

 lighter at the joints; wings hairy, veins pale, areolet distinct, 

 radial area open, cubitus equal throughout and reaching to the 

 first transverse vein, the first transverse vein dark brown, the 

 other veins pale or colorless ; abdomen as long as high and sub- 

 triangular in outline. 



The type locality of this species is probably Connecticut. The 

 galls from which it was reared are flattened circular, and were 

 found on the under surface of the leaves of Quercus bicolor. 



New Haven, 30 September, 1896 (W. E. B.). 



°N. floccosus Bassett. Oak Flake Gall. 

 Length i mm. or a little longer; mostly shining black and 

 smooth ; antennae 13- jointed, the third joint a little longer than the 

 first and second combined, the succeeding ones slightly increasing 

 in thickness toward the last, antennae as a whole of a pale dusky 

 yellowish brown ; thorax without grooves, scutellar f oveae want- 

 ing; legs dark brown, except the joints and the tarsi, which are 



