78 THE CANADIAN ENTOMOLOGIST. 



shade lighter. Antennae 15-jointed, 3rd joint incised. The antennae are 

 much longer than in the female, and the first four joints darker and the 

 remaining ones a little lighter, and the transition less abrupt than in that 

 sex. Abdomen small. The first segment twice as long as the second. 

 Length (dry specimens), body .07, wing .07, antennae .08. 



Cynips Q, utricula, n. sp. 



Globular, monothalamous galls on the petioles and leaves of Qtiercus 

 alba. Thin-walled, .15 of an inch in diameter, green or purplish, pubes- 

 cent. Sometimes entirely preventing the development of the leaf, and 

 appearing on the end of the short petiole. Sometimes found on the end 

 of a vein in a partially developed leaf, and more rarely surrounded by the 

 lamina of the leaf. In the last case it appears on both sides of the leaf, 

 but is most prominent above. It contains no larval cell. In size and in 

 structure it resembles C. q. vesicula found on the same oak, but it is 

 several weeks later and the insects differ materially. 



The flies appear early in June, and are of both sexes. 



Female : Head black, very finely wrinkled, face sparsely covered with 

 short stiff hairs. Antennae 13-jointed ; ist short, club-shaped ; 2nd 

 globular, 3rd long and straight, 4th three-fourths as long as the 3rd ; 5th 

 and succeeding ones, except the terminal one, one-half as long as the 

 3rd ; 13th long and with an indistinct suture in the middle. Color clear 

 yellowish brown at the base, gradually changing to dull deep brown at the 

 tip. Thorax black. Mesothorax finely rugose. Parapsidal lines distinct, 

 and a broad, deep median line from the collare to the scutellum. Line 

 over the base of each wing present but indistinct. Scutellum coarsely 

 wrinkled, sparsely hairy. Fovae connate, deep, smooth and shining at the 

 bottom. Legs, two anterior pairs yellowish brown, except the trochanter, 

 which is nearly black. Posterior pair darker brown. 



Abdomen black, shining. Sheath of the ovipositor with short hairs at 

 the tip. It turns upward and extends above the dorsum as in C. q. operator. 

 Wings hyaline. The subcostal and the ist and 2nd transverse veins 

 shining brown, rather heavy, the others quite pale. The cubitus does not 

 reach quite to the ist transverse. 



Areolet very small, and in some cases wanting. Radial area open. 

 Surface of the wing more hairy than is usual among the Cynipidae, 

 Length (dry) .10. 



Male : Black, except the legs and the antennae, which are a little 

 darker than the female. Antennae much longer than the female, 15- 



