54 THE CANADIAN ENTOMOLOGIST. 



Thorax very finely punctate on the mesothorax, coarser and less regu- 

 lar on the scutellum and with scattered microscopic hairs throughout. 

 Parapsidal grooves : These differ considerably from the usual form, inasmuch 

 as the anterior parallel pair are perceptible only under a powerful lens and 

 appear as smooth shining undepressed lines, and the two diverging lines 

 which rise on the posterior margin reach quite to the collare. These last are 

 very distinctly impressed, as is also the line over the base of each wing. 

 Fovce small, appearing as a shallow, smooth groove at the base of the meso- 

 thorax. There is a scarcely perceptible ridge dividing the groove in the 

 middle. On the breast there is a black spot which is usually quite con- 

 cealed by the head, and also a dark brown spot on the posterior angle of 

 the thorax; this is concealed by the wings when they are closed. Legs 

 the same color as the body, except that the tarsi are dusky brown and the 

 ungues black. 



Wings of a decidedly yellowish hue. Veins slender and pale, areolet 

 distinct ; radial area open, long and very narrow. 



Abdomen large; ist segment with a dark, highly polished spot on the 

 anterior dorsal margin, and laterally there are a few fine hairs ; 2nd and 

 3rd segments each with a dark nebulous spot, similarly situated, but less 

 intense and less sharply defined than that on the first segment. Sheath 

 of the ovipositor not exserted, a little darker than the general surface of 

 the body, and with short hairs or bristles along its whole length. In the 

 living specimens there is on each side of the sheath a dark curved line, 

 and seen from beneath these form an elliptic oval. Length .15; wing .18; 

 antennae .13. 



Described from numerous living specimens. 



Cynips Q. Suttonii, n. sp. 



Hard woody galls forming a prodigious enlargement of the small twigs 

 and branches of Quercus sp. ? from Cal. They vary in size from one- 

 half to more than two inches in diameter. Most are globular, while a few 

 are elongated in the direction of the twig which they surround. The 

 wood is very hard, and is curled and twisted as in woody knots generally. 

 The bark is smooth, and in young galls polished and shining. Extending 

 from the centre of the gall quite to the bark, but not piercing it, are a 

 large number of rounded and sub-compressed hollow tubes, closed and 

 bluntly rounded at the base, and flat and slightl)- enlarged at the top. 

 They are one-half inch in length and three-sixteenths in diameter. It is 



