110 THE CANADIAN ENTOMOLOGIST. 



Head clear dark reddish brown, finely and evenly rugose. Ocelli 

 dark brown, not blacky as is usually the case among the Cynipidse. 

 Antennae 14-jointed, clear translucent brown, except the four or five ter- 

 minal joints, which are darker and more opaque. Mandibles black and 

 shining, and contrasting beautifully with the clear light brown of the face. 

 Thorax clear, translucent brown, somewhat darker than the head, coarsely 

 rugose and corrugated ; even the parapsidal grooves have a wrinkled sur- 

 face, and are in certain lights scarcely distinguishable from the general 

 surface. Scutellum like the meso-thorax, but small and ending abruptly 

 posteriorly and perpendicularly to the axis of the body. Fovae wanting. 

 AVings and wing veins, except the subcostal and 2nd transverse, perfectly 

 hyaline ; these last have a very faint brownish tinge. Areolet wanting. 

 Radial area open. Legs clear dark, somewhat paler at the joints. Tarsi 

 pale brown ; ungues nearly black. Abdomen petiolate ; ist segment 

 clear brown at the base, changing to shining black posteriorly ; in length 

 equal to one-half the entire abdomen ; remaining segments of an opaque 

 brownish black, and with a fine microscopic punctation. Venter and the 

 sheath of the ovipositor clear shining brown, the sheath without hairs and 

 only moderately exserted. 



Length — body .11, wing .12, antennte .06. 



C. ciNEROSA, n. sp. 



Globular, monothalamous galls, from three-fourths to one inch in 

 diameter, the surface in recent specimens covered with a mealy grayish 

 powder, which disappears when the galls have been long exposed to the 

 weather ; internally of a dense cellular structure, much like the galls of 

 C. q. globulus ; the rather large, centrally placed larval cell nearly or quite 

 free. These galls, and the gall flies produced from them, were collected 

 in Texas, and were sent to me by Mr. Wm. Saunders, of London, Ontario, 

 who received them from Prof J. M. Maisch, of Philadelphia. I have been 

 unable to learn from what species of oak they came. 



The flies, which are all females (20 specimens), may be described as 

 follows : Head small, covered throughout with short appressed hairs. 

 Tips of the mandibles shining black. Color of the head, thorax and legs, 

 a dull yellowish brown. Antennae 14-jointed ; short, hairy, dusky brown, 

 except that the first joint on the inner side, and the second and third at 

 the tips, are a paler brown and shining. 



Thorax : two parallel fines extend from the collare half way to the 



