94 THE CANADIAN ENTOMOLOGIST. 



brittle. Each gall contains a single larval cell which is kept in a central 

 position by fine, silky, radiating fibres that reach from it to the outside 

 covering. Besides these fibres, there are others that are attached to the 

 inner surface of the shell, but which are not attached to the larval cell. 

 They are much finer than tlie others and resemble coarse wool. Except 

 that these galls are smaller, and the internal structure more delicate, and 

 the surface less smooth and polished, they might easily be takeii for those 

 found on Qiioxiis rubra C. iiianis. 



Gall-flies : All females. Head brownish black, very small, though 

 transversely very broad. Vertex microscopically wrinkled. Eyes rather 

 narrowly oval. Ocelli large, black and shining. Head and face covered 

 with fine downy hairs. Antennae short, slender, hairy, shining reddish 

 brown, darker towards the tips, fourteen-jainted ; ist joint large, club- 

 shaped or ovoid with the upper end truncate and hollowed to receive the 

 globular 2nd joint ; 3rd one-fourth longer than the first two taken together; 

 4th equal to the ist and 2nd; 5th to the 9th gradually decreasing in length, 

 loth to 14th very short, scarcely longer than broad. Thorax covered with 

 bright shining hairs. Parapsidal grooves : Two parallel lines extending 

 from the coUare three-fourths the distance to the scutellum. Two diverg- 

 ing lines reaching from the scutellum to the collare. These are much 

 nearer together at their starting point on the scutellum than is usual in the 

 genus Cynips. There is the usual short line over the base of each wing. 

 (All the above markings of the mesothorax are found in most of our one- 

 gendered species — not in all, however.) The posterior limit of the two 

 parallel lines vanishes in a tuft of long hairs, which in conmion with the 

 hairs on the thorax, converge into a ridge on each of the interlinear spaces. 

 Scutellum small, but long in projjortion to its breadth, slightly shagreened. 

 Fovce very shallow, confluent, smooth and shining. Tegs dark shining, 

 semi-translucent brown, with abundance of whitish hairs. 



Wings large, surface covered wiih short, stout, nearly erect hairs, and 

 numerous dark opaque with lighter cloudy spots. \'eins dark shining brown 

 and very heavy. Cubitus, as in C. nubila^ is very broad and heavy at 

 its union with the isttransver.se; 2nd transverse broad and heavy, par- 

 ticularly at the base of the radial area. Areolet not large, but clearly 

 defined. The radial vein at its termination forms a large triangular blotch 

 7oith an indistinct areolet in the centre, liy the curvature of the radial vein 

 and its considerable l)ackward extension along the margin (jf the wing and 

 the upward exlensioii uf the coslal \ein be\ond the base of the radial area. 



