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



by a slight depression, which is rough like the rest of the scutel ; 

 legs rather pale red or reddish brown ; radial area open, areolet 

 present ; abdomen black and smooth. 



Type locality: West Rock, New Haven, among the galls of 

 Andricus exiguus and Neuroterus exiguus. 

 *D. pallipes Bassett. 



Male: length 2.25 mm.; body mostly black; head finely 

 wrinkled, wider than the thorax, first joint of the antennae smaller 

 than the second, club-shaped, second globose, both pale, third to 

 fifteenth changing gradually from pale to a dark dusky brown; 

 parapsidal grooves very distinct and closely converging at the 

 scutel, the space between the parapsidal grooves mostly polished 

 and smooth, scutel rather coarsely rugose and without foveae; 

 legs very pale brownish yellow ; wings subf uscous, veins reddish 

 brown, radial vein ending very abruptly within the margin of the 

 wing, areolet distinct, cubitus reaching to the first transverse 

 vein ; abdomen petiolate, compressed, and shining black. Female : 

 antennaa paler and the joints thereof shorter than in the male. 



The galls of this species are simply a larval cell at the centre 

 of clusters formed in the rapid spring growth of the thrifty young 

 white oak shoots. The gall is blackish brown, has a thin shell, 

 and is oblong oval. It reaches a length of slightly over 2 mm. 

 and is 1.5 mm. in diameter. The adult emerges from the apex of 

 the cell in such a way as to leave the gall resembling an egg shell 

 with the end removed. 



Type locality : Waterbury. 



*D. ignota Bassett. 

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

 tennae 13-jointed, the first and second joints dusky yellowish 

 brown, the remaining ones from dull dusky brown to dark brown ; 

 thorax microscopically sculptured or striate, the striae apparently 

 transverse though not so over the entire surface, parapsidal 

 grooves present, other impressed lines wanting, scutel finely 

 rugose and without foveae ; legs clear testaceous, the posterior pair 

 darkest, especially the femora ; wings slightly dusky, veins pale, 

 areolet bounded by almost transparent veins, radial area open ; 

 abdomen black, sheath of the ovipositor dusky testaceous at the 

 tip. 



