THE CANADIAN ENTOMOLOGIST. Ill 



scutellum. The space between these is darker than outside. There is a 

 short median Hne starting on the posterior edge arid soon disappearing, 

 and two rapidly diverging Unes from the same border, which extend half 

 way to the collare. Outside of these are two parallel lines of the same 

 length. All these are some shades darker than the general surface. 



Scutellum small, and hairy like the meso-thorax. Fovse wanting. 

 Abdomen clear shining reddish brown, except the posterior edges of the 

 segments, which are nearly black ; ist segment, except a small spot on 

 the dorsum, covered with fine short hairs ; sheath of the ovipositor very 

 large and with strong white hairs ; ovipositor shining black, and slightly 

 exserted in dry specimens. Ungues black. Wings sub-hyaline, veins 

 dark brown ; second transverse heavy. Areolet distinct but small. 

 Cubitus slender, and disappearing before reaching the ist transverse. 

 Radial vein heavy, and ending in an enlarged point within the border of 

 the wing; radial area open. Length of a specimen of average size, .18. 



This species is probably the agamous generation of what will yet be 

 found in another generatien and in another form of gall, two-gendered. 

 The galls and insects sent me vary so much in size that I strongly sus- 

 pect they may represent two very closely related species, but the slight 

 differences between the large and small flies hardly warrant me in sepa- 

 rating them till I can learn more of their habits. My description refers 

 to the largest specimens. 



C. FLoccosA, n. sp. 



The late, terminal leaves of the thrifty shoots of young oaks of the 

 species Q. bicolor are often thickly dotted on the under side Avith 

 small hairy, or rather woolly, galls, sometimes as many as two hundred 

 being found on a single leaf The leaves are sometimes quite small, and 

 in such instances the galls become nearly or quite confluent. They 

 measure, including their woolly covering, about .15 of an inch across, but 

 divested of this, only .05 or .06, and each contains but a single larva. 

 The larva is free, having no larval cell. The galls are hemispherical, and 

 attached by their flat side to the leaf, and they show on the upper surface 

 only as small, smooth, flat, shining blisters. They are so much infested 

 by inquilines and other parasites that all attempts to rear true gall flies 

 from them proved fruitless for many years. I, at length, succeeded in 

 rearing in the spring a considerable number of true gall flies from galls 

 collected the October preceding in Northern Ohio, Only females have 



