THE CANADIAN ENTOMOLOGIST. 109 



Wings hyaline. Veins almost black, all clear and distinct. Areolet 

 small but very sharply defined. Cubitus unusually heavy its entire 

 length. Radial area open, the veins enclosing it strong and dark quite to 

 the edge of the wings. Abdomen smooth, shining black, much shrunken 

 and distorted in the dry specimens, and the long ovipositor much ex- 

 serted. 



Length — body .08, wing .09, antennae .06. 



These galls are invariably preceded by a vernal crop, which affects the 

 leaves only, and which may be described as follows : Gall, an enormous 

 development of the mid-vein of the leaf, often to the extent of an inch in 

 diameter and an inch and a half in length. Green, smooth, but irregular 

 in shape, and succulent and a little harder than a green grape. The 

 blade of the leaf dwarfed and curled, and after the galls mature drying up. 

 In some years these galls are so abundant on certain trees as to affect 

 nearly all' the vernal leaves, but a later crop hides the blighted appear- 

 ance they produce. They are filled with larval cells, from which are pro- 

 duced vast numbers of male and female gall flies, about the twentieth of 

 June. Long observation has satisfied me that this is the bisexual genera- 

 tion of C. noxiosa. The females of this brood agree exactly with the 

 above species, except in size and in the length of the antennae, they being 

 a little smaller. 



Length — body .07, wing .08, antennae .04. 



The males, which are nearly or quite as abundant as the females, differ 

 from them as follows : Color throughout somewhat paler. Body longer. 

 Antennas 14- jointed, 3rd joint curved but not incised. Legs clear yellow- 

 ish brown. Abdomen small, petiolate, petiole slender. 



Length — body .09, wing .08, antennae .05. 



Large numbers of both generations in my collection. 



Cynips corrugis, n. sp. 



This species is founded on a single specimen which I took from the 

 claws of a small spider that had evidently just killed it. The spider was 

 in a cluster of the sterile flowers of Quercus prvioidcs. The capture was 

 made "on the nth of May. This species is remarkable for the almost 

 diaphanous wing veins, the pedicellate abdomen, and the coarsely corru- 

 gated sculpturing of the thorax. It is a female, and may have been in 

 the act of ovipositing in the young acorns or the buds of this oak when 

 killed by the spider. The description is as follows : 



