Deseriptions of New Cynipidce 199 



The galls fall to the ground in the autumn in advance of 

 the leaves, and the flies emerge the following summer. The 

 galls are abundant at Ames, Iowa, and I have taken a number 

 in the vicinity of Champaign, 111. 



Gall-fly. — A robust, black species, with more or less rufous 

 on face, mesonotum, scutellum, and sides of abdomen. Length, 

 3^ to 4 mm. 



Head: Face scabrous, shining, with very few hairs; vertex 

 black, sub-opaque, finely and densely sculptured; ocelli consid- 

 erably elevated, clypeus polished, emarginate, punctured; an- 

 tenna; black, 14-jointed (in one specimen 13-jointed), a -trifle 

 over 2 mm. in length; joints 1 and 2 stout, the latter sub- 

 globular, joint 3 one third longer than joint 4, last joint 

 scarcely longer than the preceding. Thorax: mesothorax 

 covered with a fine net-work of depressed lines leaving irregular 

 raised portions that are highly polished, parapsides narrow but 

 well defined, polished at the bottom and reaching the collar, 

 median groove showing plainly at scutellum but soon disap- 

 pearing as it runs forward; the two parallel grooves from the 

 collar narrow at first, then spreading out in broad furrows 

 with sloping sides traceable about one third of the way to 

 the scutellum; lateral grooves plainly marked, extending well 

 forward, and approximating the parapsides at their anterior 

 extremity; pleura; finely aciculate and shining. Scutellum 

 bifoveate, the fovese shallow, separated, not by a septum, 

 but by a number of polished raised lines that run into the 

 smooth surfaces of the bottoms of the foveas; lateral bor- 

 ders of the scutellum strongly aciculate anteriorly, the lines 

 becoming crooked and broken posteriorly and forming a densely 

 and deeply rugose surface; scutellum black at base and tip and 

 rufous in the middle. Abdomen dark rufous to almost black, 

 2d segment occupying one half of tergum, posterior half of the 

 second segment and all of the following segments rather densely 

 punctured, all of the segments highly polished. Feet uniformly 

 colored, very dark rufous to almost black. Wings hyaline, 

 rather densely ciliate, 4 mm. long, submedian and 1st and 2d 

 transverse nervures stout and black, areolet medium. 



Described from two bred females from galls taken at 

 Ames, Iowa. Male unknown. 



