No. 22.] HYMENOPTERA OF CONNECTICUT. 4II 



tinct, scutel microscopically wrinkled and with shining fovese ; 

 legs dark translucent brown, paler at the joints and tarsi than 

 elsewhere; wings subhyaline, veins distinct in the basal portion 

 of the wing but hardly noticeable beyond, radial area open, areo- 

 let bounded above by a longer vein than the others surrounding 

 it, the cubitus reaching half-way to the first transverse vein ; 

 abdomen with its second segment almost tubiform and covering 

 all of the following segments in the dry specimens. 



The galls of this species are 3 to nearly 4 mm. in diameter, 

 perfectly round, and to be found at various places on the leaves 

 and occasionally on the sterile aments of Quercus obtusiloba. 

 They are pruinose and their walls are very thin and do not 

 enclose a larval cell. In many instances the blade of the leaf or 

 the part affected by the gall is reduced to a mere rudiment of 

 irregular form and varying size, but in such cases the gall is 

 always banded by a minute ridge answering to the leaf blade. 

 It bears a close resemblance to A. utriculus Bassett. 



Type locality: East Rock, New Haven. 



A. perditor Bassett. 



Head, antennae and legs deep brownish red ; head finely punc- 

 tate ; mesothorax darker than the head and scutel ; antennae 14- 

 jointed, first joint ovate, second subquadrate, third and fourth 

 nearly equal ; parapsidal grooves very slender and subobsolete in 

 front, lines at the bases of the wings present but indistinct, scutel 

 ending in a blunt rounded point, rugose and hairy and with rather 

 widely separated fovese; legs light brown at the joints; wings 

 with their veins dark brown, areolet wanting, radial area open; 

 abdomen black and polished, the second segment three-fifths as 

 long as the entire abdomen. 



The galls of this species are 3 to nearly 4 mm. long and 2.5-3 

 mm. broad. The base is broad, the apex conical, the base with 

 the cicatrix of a true acorn. They occur in among the acorns 

 of Quercus^ ilicifolia in the Spring of the acorns' second year's 

 growth, at which time the latter are very like these galls in 

 appearance. 



*A. petiolicola Bassett. Oak Petiole Gall. 



Female : length 2.5 mm. ; vertex of the head black, nearly 

 smooth, face brown and pubescent, the mouth parts lighter in 



