96 THE CANADIAN ENTOMOLOGIST. 



and the thick dark spot at the confluence of the veins, which usually marks 

 the obsolete areolet, also wanting. Cubitus very pale, and reaching only 

 half way to the first transverse. Radial area open. Abdomen black, 

 shining ; ist, 2nd and 3rd segments dorsally sub-equal, ist with a minute 

 round, dense tuft of hair on the sides beneath the wings. Sheath of the 

 ovipositor not exserted, inconspicuous, a few minute hairs at the point. 

 Length — body .12, wing .15, antenna; .10. 



Described from living insects cut from the galls, Oct. 23, 1S79. I'he 

 flies probably live in the galls over winter. 



C. MINUTA, n. sp. 



As sooii as the leaves of Qiiierais alba begin to expand in the spring, a 

 few buds are occasionally seen that develop into a cluster of greatly 

 enlarged petioles without a leaf blade, or at most only a very rudimentary 

 one. They are three or four times the size of those of a full grown leaf, 

 and each contains a number of larvje of the small gall insect which I have 

 named C. ininuta. The larvae mature very rapidl)- and the imagos 

 leave the gall about the time that the leaves are full grown. Occasionallv 

 an embryo leaf seems to have escaped the sting of tlie mother insect, and 

 a fully developed leaf apj^ears among the galls, but such instances are not 

 common. The galls are pubescent and usually of a jMnkish color. The 

 insects are of both sexes, and may be described as follows : 



Male : The entire body a clear semi-tran.sparent amber, with a shade 

 of brown on the thorax and the back of the abdomen. The eyes and 

 ocelli a dull black, the latter much less prominent than in C. vesiaila, 

 n. sp. (next described). .\ntenniv 14-jointed, the first three joints i)ale 

 amber, the remaining ones by a sudden transition a dusky brown ; ist 

 joint club-shaped, 2nd oval, 3rd long and slender, curved, hut only slightlv 

 incised ; remaining ones short and of nearly equal length. 



Thorax smooth and shining, hut in certain lights the living specimens 

 show bands of darker brown where the ])ara])sidal grooves appear in other 

 species. Scutellum small, smooth and shining. Fova; wanting, but the 

 furrow separating the mesothorax and scutellum broad and deep. 



Wings with a slight smoky tinge, veins distinct. Cubitus reaching 

 quite to the ist transverse. Areolet of medium size. Radial area long 

 and narrow, partially closed by the thickened border of the wing as in 

 C. vesicula. Legs of a uniform ]3ale amber, ungues dusky brown. 



