84 H. r. BASSETT. 



Female. — Head and thorax very dark brownisb red, punctation same as in 

 the male; antennse tliirteen joints, a shade darker than the male; the mesono- 

 tum differs from the male as follows: there is no median line and the grooves 

 over the base of the wings extend qnite to the base of the scutellum, which is 

 wrinkled rather than rugose and the fovese less polished and less widely sepa- 

 rated. Abdomen shining, and of the same dark red as the thorax. Legs darker 

 than the male. Wings show no difference ; ungues two-toothed, placing it iu the 

 genus Andricus. Length of the body .12 inch. ; wings, 14 inch. 



Described from twelve specimens reared in April, 1877. 



ACRASPIS Mayr. 



1. A. macrocarpae n. sp. 



Gall perfectly oval in form, .15 of an inch in length by .12 in 

 thickness. Generally found on the lateral veins on the underside of 

 the leaves of Quercus macrocarpa, but occasionally found on the 

 upperside. They are attached lengthwise to the vein and the point 

 of attachment is .10 inch. long. The hole made by the escaping 

 gall-fly is invariably on the end towards the base of the vein, but 

 this is not always the case with the parasites that infest this species. 



The surface presents a crackled appearance, fine lines dividing it 

 into a large number of facets, each of which is crowned with a short 

 hard point. The facets are angular in outline, and with from three 

 to six unequal sides ; they are never rectangular and the prevailing 

 fio-ure is an irregular pentagon. The color, when young, like that 

 of the leaf There is no free larval cell for the single larva and the 

 space between the outer and inner surface of the gall is filled with 

 a hard, crystalline, ])inkish substance. 



Twenty to twenty-five galls are sometimes found on a single leaf, 

 but usually the number is much smaller. 



The gall-flies are all females, with rudimentary wings ; they leave 

 the galls in the autunui, but their further history has not been traced. 



Gall-flies. Hedd black ; antennse with fourteen joints, black, long and slen- 

 der, first joint ovate, second small, oval : third twice as long as the two preceding 

 taken together: the fourth, fifth, sixth and seventh, each gradually shorter; re- 

 maining ones short and subequal ; face and cheeks hairy. Thorax grayish by 

 reason of the short, appressed hairs; mesonotum very short, parapsidal grooves 

 are present, but obscured by the hairs; scutellum comparatively large and ele- 

 vated posteriorly and nearly as long as the mesonotum. Wings veinless, narrow 

 scales as long as the entire thorax. Abdomen black, compressed laterally, and the 

 sides of the second, third, fourth and fifth segments covered with short appressed 

 hairs ; dorsal and ventral parts and the terminal segments smooth, shiuing black. 

 Legs dark brown; ungues two-toothed. Length: body, .11 inch.; antennae, 

 .10 inch. 



