234 DAVENPORT ACADKMY OF SCIENCES. 



quite conical, with the opening completely closed. The upper 

 side is quite flat, somewhat sunken beneath the plane of the leaf 

 and often most beautifully red, yellowish or paler than the leaf. 

 On the lower side the galls are either pale green or whitish and 

 the surface covered more or less densely with pale pubescence. 



Stem-mother. — lycngth about o.8"™-. Shape oval or pyri- 

 form, broadest across the mesothorax, tapering gradually towards 

 the end; slightly indented or constricted beyond the head. Head 

 small, about twice as broad as long, almost half-circular in out- 

 line. Eyes very small and blackish. Antennae and legs pale 

 dusky. The head as well as the body is sparsely beset with 

 medium-sized, rather stout, stiff, spine-like bristles, some of 

 which are placed in rows. A double row of these spines fringe 

 the whole body and are divided as follows: Eight pairs fringe 

 the head, two pairs each side of the pro- and meso-thorax, three 

 pairs each side of the meta-thorax and one pair each side of the 

 abdominal segments. Color yellow. 



Migratory female. — Length of body 0.9-1.2™"-. Expanse 

 of wings 2.2-2.8™™-. Color of both the adult and pupae, orange. 

 Head, mesothorax, scutellum and sternal plate black, antennae 

 and legs dusky ; eyes brown or dark purple. The prothorax is 

 often faintly dusky and is often marked medio-dorsally with 

 three more or less distinct, minute spots, of which the two smaller, 

 anterior ones, are more or less oval, and the larger, posterior one, 

 linear. Antennae distinctly three-jointed and about as long as 

 the tibiae. The two basal joints are shortest, about equal in 

 length and but faintly annulated ; the third is much the longest 

 and almost three times the length of the two basal joints com- 

 bined; it is almost uniform in diameter throughout its whole 

 length, quite straight, with a short pedicel at base and a distinct 

 nipple at tip showing at least two well-marked annulations and 

 provided with three extremely fine hairs at tip. The whole joint 

 is but faintly annulated, the annulations being more numerous 

 and more distinct at its basal fourth. The usual two sen- 

 soria are almost obsolete, at least the lower one, which could 

 scarcely be detected, whilst the upper one is very slender and 

 about half as long as the joint. Wings ample, faintly dusky, 

 the veins and stigma darker, the subcosta yellowish at base. Of 



