426 CONNECTICUT GEOL. AND NAT. HIST. SURVEY, [Bull. 



Species of oak. Most of the leaves which bear the galls are fully 

 developed, but some are more or less imperfect and occasionally 

 a gall is found on what is but a mere rudiment of a leaf. The 

 galls appear with the leaves and the insects come out early in 

 June. This little gall is a true larval cell, and its thin walls offer 

 slight obstacles to the attacks of parasites. 



A. (Callirhytis) radicis Bassett. 



Length 4 mm. ; dark reddish brown ; head opaque ; face, cheeks 

 and vertex with short, bristle-like hairs, antennae 14-jointed, the 

 first joint short and thick, the second globular, length of the third 

 one-fourth less than that of the two preceding, the diameter of 

 each from the eighth to the fourteenth inclusive equal to thdr 

 length, the last forming a very blunt cone, color of the antennae 

 dark reddish brown, changing gradually to a dark dusky brown 

 toward the apex; thorax black, the punctuation fine, regular and 

 even, parapsidal grooves extending throughout, shining lines over 

 the base of the wings, a narrow but distinct median line from the 

 pronotum to the scutel, and two parallel lines one on each side 

 of the median line and in close proximity thereto, reaching half- 

 way from the pronotum to the scutel, which latter is irregularly 

 wrinkled, its fovese round and shiny ; abdomen dark reddish brown 

 with brown translucent edges ; second segment very long and 

 with a dense band of yellowish white hairs on the anterior mar- 

 gin, the third segment mostly, and the remaining ones quite 

 conceafed ; legs with trochanters black, the remaining joints very 

 dark cinnamon brown, claws black, simple; wings hyaline, prin- 

 cipal veins pale brown, others colorless, radial area present, the 

 angle of the first transverse vein projecting sharply into the basal 

 portion, areolet and the lateral veins bounding it entirely colorless. 



Said to be an agamous form of A. futilis euroterus Osten 

 Sacken. The author of this species under his original description 

 writes that those taken in the act of ovipositing were in all 

 respects like these described, except that the color of the antennae, 

 legs, and wings was a trifle darker — owing, no doubt, to the fact 

 that these were exposed to the sunlight while the others were not. 

 The females reared from futilis galls one season were 2.5 mm. in 

 length, with wings of the same length as the body, and 13- jointed 

 antennae, nearly 2 mm. in length with a partial suture on one side 



