198 Illinois State Laboratory of Natural History 



Gall-fly. — Females. — Head and thorax rufous, abdomen 

 black, head nearly twice as broad as thorax, the latter very 

 small and narrow, abdomen very much compressed and, when 

 viewed from the side, appearing twice as large as the head 

 and thorax together. 



Head: face and gense reddish brown, vertex and occiput 

 dark brown, mandibles black, clypeus punctured and with few 

 hairs, the entire head covered with a net-work of depressed 

 lines; antennoe rufous, 14-jointed. Thorax very small and 

 narrow, seeming, when viewed from above, out of all pro- 

 portion with the comparatively large and very broad head; 

 sculptured like the head without the usual furrows; scutellum 

 very narrow and much elevated posteriorly, and appearing, 

 when viewed laterally, in the shape of a crow's beak; a shining 

 transverse groove but no fovese at base. Ahdomen very strong- 

 ly compressed, not broader in the thickest part than the 

 thorax, shining black in color with some rufous at base, free 

 from hairs or punctures, as deep as long, its length compared 

 with that of the entire insect being as 3 to 5 and the 2d 

 segment occupying fully two thirds of the dorsum. Feet dark 

 reddish brown. Wings entirely wanting. 



Described from two specimens cut from galls taken at 

 Ames, Iowa, where they are common. 



Genus Dryophanta Forst. 



D. lanata n. sp. 



Galls. — During late summer and autumn the galls of this 

 species are found on the under side of leaves of Qucrcus rubra 

 and Q. coccinea, appearing externally as little bunches of 

 compact brown wool (PI. IX., Fig. 5), and hardly distin- 

 guishablein outward appearance from the gallsof AndricKsflocci 

 Walsh. The galls seldom occur singly, but usually in clusters of 

 from four to eight. A cluster of eight galls when fully grown 

 will nieasureabout j]of an inch in width by [^ of an inch in length. 

 An individual gall when denuded of its covering is in the form 

 of an irregularly shaped cone with a bulging base, the diameter 

 of the base being three or four sixteenths of an inch, which is 

 nearly twice the height. 



