108 THE CANADIAN ENTOMOLOGIST. 



seen in many Braconides. Thorax black, lustreless, sparsely covered with 

 very fine short hairs. Parapsidal grooves faint and indistinct, converginfi; 

 slightly as they a]:)proach the scutellum. A very faint median line, dis- 

 cernible on tlie posterior part of the mesothorax, extends one-third the 

 distance to tlie collare. Surface of the entire thorax. 



Fovffi present but indistinct. Legs reddish brown. Abdomen shining 

 black. Sheath of the ovipositor yellowish. Ovipositor yellowish brown, 

 and remarkable for its great length. In all my dry specimens it is ex- 

 serted to a length at least five times that of the entire body, and is coiled 

 two or three times. 



Wings hyaline. Costal and first and second transverse veins fine 

 clear reddish brown, the others fine and nearly colorless. Cubitus ex- 

 tremely faint, and quite disappearing before reaching the first transverse. 

 Areolet small and elongated, and in some specimens wanting. Radial 

 area open. 



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



C. NOXioSA, n. sp. 



Galls : Large, woody, polythalamous, terminal or sub-terminal swell- 

 ings on the twigs of Q. bicolor, varying greatly in size and form, but usu- 

 ally tuber-like and three or four times as long as thick. The larger speci- 

 mens in my collection are nearly an inch in diameter and four inches 

 long, and contain a large number of insects. The smallest are almost 

 imperceptible swellings, and have often but a single insect. These galls 

 develope in the summer, and the insects, which are all females, live in 

 the galls over winter, coming out before the leaves appear in the spring. 

 They resemble, both gall and gall-fly, C. batata B., and I for a long 

 time, considered them a variety of that species. Some new facts in the 

 history of C. batata B. having been learned, I shall re-describe it in 

 these articles, when the differences between the two species will be stated. 

 C. noxiosa is described as follows : 



Head black, finely and regularly punctate. Antennse 13-jointed ; ist 

 dark, nearly black ; 2nd and 3rd brownish yellow, the remaining ones 

 gradually changing to dark dusky brown. Thorax smooth, but under a 

 one-eighth lens showing a beautifully fine crackled surface. Parapsides 

 entirely wanting. Surface of the scutellum like the meso-thorax, though 

 the markings are a trifle coarser. Fovse wanting. Legs dark shining 

 brown, with clear yellowish brown joints. Tarsi dark yellowish brown. 



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