1 8^3.] ENTOMOLOGICAL NEWS. 2^ 



this date (November 19th) none of the flies have gnawed their 

 way out of the galls, but a considerable number have been re- 

 moved by the aid of a pocket-knife. As the galls have been 

 kept in a warm room since the last of September, it seems prob- 

 able that the flies do not emerge in the natural state before 

 Spring, whereas A. macrocarpce emerges in the fall. The flies 

 differ from macrocarpce by having the third joint of the antenna 

 but very litde longer than the first and second together, by hav- 

 ing abortive wings not more than three-fourths as long as the 

 thorax, by having the abdomen globular, not compressed, and 

 by varying from 2.5—3 mm. in length. Specimens of 7nacro- 

 carpa in my collection reared from galls upon Quercus macro- 

 carpa in Iowa all have the sides of the front, the lateral margins 

 of the mesonotum and the sides of the scutellum decidedly ru- 

 fous. In undulata all of these parts are black, as is the entire 

 insect, except a litde rufous coloration on the tips of the coxae- 

 and at the joints of the feet. Described from nineteen specimens 

 cut from the galls, all alive and active, and apparently fully 

 mature. 



HOLCASPIS. 

 H. rabens n. sp. 



Galls.— T\v^ galls are globular, from 10—14 mm. in diameter, 

 composed of a dense corky substance, each with a single larval 

 cell that is easily detached from the surrounding portions, at- 

 tached singly to small twigs. They have either a smooth or 

 rough exterior, and are of a light straw color, usually consider- 

 ably tinted with red. They resemble very closely the galls of 

 Holcaspis rugosa Bass. The flies, however, are very different. 



Gall-flies. — General color rufous, with lines over the base of the wings;: 

 two parallel lines on anterior portion of mesonotum, line at base of scu- 

 tellum, sutures of thorax and sternum, black. Head small; face hairy 

 and coarsely punctured; sutures surrounding clypeus, tips of mandibles, 

 usually the terminal joints of the labial and maxillary palpi, pits for the 

 insertion of the antennae, eyes and ocelli black; antennae 14-jointed, ru- 

 fous, shading into black towards the tip. Thorax and scutellum coarsely 

 punctured and hairy ; parapsidal grooves distinct, but extending only 

 about half way from the scutellum to the prothorax. In some specimens 

 the black lines of the mesonotum are dim or wanting, while in others 

 they are heavy, the two parallel lines often coalescing; scutellum with 

 shallow groove and no foveae at base; metathorax black. Abdomen pol- 

 ished, with hairs upon the sides of the second segment, ovipositor sheaths 

 black, a characteristic black dash across the venter, general color rufous^ 



