406 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



*A. ilicifoliae Bassett. Scrub Oak Gall. 



Female : length 4 mm. ; mostly black ; vertex of the head and 

 the entire thorax black, deeply and irregularly sculptured ; face 

 rugose and pubescent, with the hairs converging toward the 

 mouth, palpi shining reddish brown, antennae 13-jointed, the 

 apical joint with an imperfect suture apparent on the inner side, 

 first and second joints shining black, the remaining ones pubes- 

 cent and dull black; thorax pubescent, the parapsidal grooves 

 obliterated by a coarse, somewhat linearly arranged sculpture, 

 scutellar foveae sculptured like the rest of the scutel ; legs with 

 their coxs and the upper part of the femora of the anterior and 

 middle pairs black, rest of the anterior and middle pairs reddish 

 brown, posterior pair black, reddish at the joints ; wings slightly 

 dusky, veins brownish black, areolet very small, vein at the base 

 of the open radial area covered by a large brownish black cloud, 

 which covers part of the areolet but does not reach to the anterior 

 margin of the wing, in some individuals in addition a light brown 

 cloud in the basal cell; abdomen black and shining, except the 

 ventral edge, which is clear brownish red. Male : length 3.5 mm. ; 

 differs from the female in having 15-jointed antennae, and in the 

 darker legs, the posterior pair of which, including the tarsi, are 

 almost entirely black. 



The galls of this species measure as much as 50 mm. in length 

 and 21 mm. in diameter, though the average size is more nearly 

 43 mm. for the length and 18 mm. for the diameter. They are 

 elongated, fusiform, erect or nearly so, apparently growing out 

 of the petiole of the leaves of Quercus ilicifolia and from the 

 upper side of the petiole. Their apex is rather long and more 

 slender than the basal portion and often considerably curved. 

 The central space containing the larvae is kept in place by radiat- 

 ing woody fibres. The advent of the gall sometimes entirely pre- 

 vents the development of the leaf on the upper side of which it 

 has formed. 



Type locality : Waterbury. 



°A. prunus Walsh. Acorn Plum Gall. 

 Female : length 5-7.5 mm. ; mostly black ; head rather coarsely 

 rugoso-punctate, face pubescent, antennae 13-jointed, the apical 

 joint as long as the eleventh and twelfth combined; thorax 



