Descriptions of New Cynipidce 197 



A. bicolor n. sp. 



Gall-fly. — Female. — Head and thorax opaque black, abdo- 

 men and antennas rufous; length, 3 mm, 



Head black, finely and densely sculptured, mandibles 

 except tips rufous, face between eyes and mouth coarsely 

 aciculate, frontal ridge rather prominent, ocelli in nearly a 

 straight line. Antennae dark rufous, 13-jointed, 3d and 4th 

 joints equal in length, 13th joint about as long as the two 

 preceding taken together. Thorax^ including pleurae, densely 

 and finely sculptured, parapsidal and median furrows distinct 

 and extending to the collar, lateral furrows and two parallel 

 lines plainly marked. Scutellum sculptured like the meso- 

 notum, bifoveate. Abdomen rufous, polished, 2i segment occu- 

 pying a little more than one third of the dorsum, 3d seg- 

 ment very broad, and microscopically punctured on apical 

 portion, succeeding segments to the 7th all exposed and rather 

 densely punctured as seen under a power of 70 diameters, 

 venter rather prominent, and ovipositor sheaths projecting 

 slightly. Feet: the tarsi, tibiae of front pair, and joints of 

 all the legs are more or less rufous, the remaining portions 

 black. Wings hyaline, radial cell open, all- the nervures, 

 except the two transverse, very weak, areolet entirely wanting. 



Described from a sir)gle specimen from Normal, 111., ac- 

 cessions number 2584. Gall unknown. 



GrENUS ACRASPIS Matr. 



A. compressus n. sp. 



Gall. — Small sub-globular bodies from 2 to 3 mm. in 

 diameter attached to the under side of the leaves of the red 

 oak, Quercus rubra, in the fall, about the time the leaves 

 are beginning to turn brown. The galls appear like wax, 

 and are either pure white or tinged with red while on the 

 leaves, and when cut into are fleshy and juicy like a potato. 

 The galls fall to the ground with or a little before the leaves, 

 and each develops a single larva which gets its growth in 

 the fall but does not emerge until the following summer. 

 Only a very thin shell of the gall is left after the fly emerges. 



