1864.] 681 



QuERCUS ILICIFOLIA. Galls growing in clusters from three or four 

 to a dozen together ^on the limbs and occasionalli/ on the trunks of young 

 shrub oaks. They are cone-shaped, truncate at the base, the apex often 

 prolonged in a slender, recurved point. They are from four to five- 

 eighths of an inch long, and from one-fourth to three-eighths in diame- 

 ter at the base. When green, often of a deep red color; ivhen dry, 

 brown or black; very hard, enclosing a nearly free larval cell like that 

 of C. q. globulus. Fitch. 



C. q. ventricosa n. sp. 



9 . Head and thorax a bright cinnamon color, head finely punctate, face pu- 

 bescent, dark brown around the mouth, tips of the mandibles black, palpi pale 

 brown. Antennce long, 15-jointed, third joint longest, others gradually decreas- 

 ing in length to the loth, which is as long as the two preceding ones, and shows 

 plainly a connate suture. Thorax finely and evenly punctate; parapsidal 

 grooves not deep: the line dividing the mesothorax lengthwise reaches from the 

 collare to the scutellum; each side of this is a line reaching halfway from the 

 coUare to the scutellum, and marked with an indentation at the posterior end; 

 also a deep linear depression on each side over the base of the wings; pleura 

 microscopically punctate; mesothorax bounded on the sides and where it joins 

 the scutellum by a dark reddish-brown line. Scutellum very finely sculptured, 

 a dark and narrow ridge dividing it half the length. Feet yellow, tips of the 

 tarsi black. Wings hyaline; the subcostal, anal, first and second transverse 

 veins large, dark reddish-brown; the first two rather paler towards the base; 

 areolet distinct; radial area open, the vein forming its base considerably en- 

 larged. Abdomen darker brown than the thorax; segments short, second long- 

 est; vertical diameter, i. e. the distance from the back of the abdomen to the 

 ventral edge, equals or slightly exceeds the length ; terminal segments show a 

 fine punctation. Length .14. Male unknown. 



My galls were collected in June. The flies were found to be fully 

 developed in October. They were cut out, else they would probably 

 have remained in the galls until spring. 



QuERCUS ILICIFOLIA. Elongated, fusiform galls growing on the 

 upper side of the leaves of Q. ilicifolia, and standing erect, or nearly 

 so — sometimes entirely preventing the development of the leaf, and ap- 

 parently growing out of the petiole. The central nucleus containing the 

 larvae, is kept in place by radiating woody fibres as in C. q. inanis 0. S. 

 The largest galls are two inches in length and seven-eighths of an inch 

 in diameter ; average size about one and three-fourths inches long, and 

 three-fourths in diameter. Apex rather longer and more slender than 

 the basal portion, and often considerably curved. 



