682 [December 



These galls are of the same dark green as the leaves. Many are 

 found very much smaller than those described above, but they produce 

 parasitic flies. Baron Osten Sacken writes me that he met with num- 

 bers of these galls in Pennsylvania several years ago. They are rather 

 rare here (Conn.) 



ft. q. ilicifoliae n. sp. 



9 Black, vertex of the head, and the entire thorax black, and deeply and 

 irregularly sculptured; face rugose and pubescent; hairs converging toward 

 the mouth; palpi shining reddish brown. Antenyice 13-jointed, the 13th long, 

 and with a false suture apparent on the inner side; first and second joints very 

 short, shining black; the remaining ones pubescent, and dull black. Thorax 

 with a coarse pubescence. The parapsidal groove obliterated bv the coarse, 

 somewhat linearly arranged sculpturing. Fovese large but sculptured like the 

 rest of the scutellum. Feet: coxse, and the upper part of the femur of the two 

 anterior pairs black — other parts reddish-brown; posterior pair black, reddish 

 at the joints. Abdomen black shining, the ventral edge clear brownish red. 

 The segments, except the first and second, with a very fine microscopic punc- 

 tation, most apparent on the third segment. Wings slightly dusky; veins brown- 

 ish black, heavy; 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 the anterior margin of the wing. A very light brown cloud in 

 the basal cell of some specimens. Length .17. 



% . — Antennae 15-jointed, feet darker than those of the female : posterior pair, 

 including the tarsi, almost entirely black. Otherwise like the female except the 

 usTial sexual differences. Length .14. 



Ten 9 <^Qd four % specimens. 



QuERCUS ALBA. F/af, green, succulent galls, often of a very irregu- 

 lar outline, and from one-fourth to more than an inch in diameter, the 

 vertical diameter from one-fourth to three-eighths of an inch, growing on 

 the leaves of the white oak, and producing, according to the size, from 

 two or three, to more than a dozen gall-flies. 



The flies escape from the galls in June, through the upper or under 

 surface. The water that enters the cavities the flies have left causes 

 the galls soon to decay and drop ofi", but a few change to a dry pith- 

 like substance, and remain on the tree through the summer. These 

 might be taken for a dift'ei*ent species, as they generally contain larvae, 

 but having reared a few Spalangia (?) from such galls, I infer they are 

 all parasitic. 



This species is closely related to C. q. irregularis 0. S. but grows on 

 a different species of oak, and Baron Osten Sacken to whom I sent 



