236 DAVENPORT ACADEMY OF SCIENCES. 



the " Meier Pecan," imported two years prior from Bluffton, Mo., 

 to the Department of Agriculture at Washington, D. C. Numer- 

 ous additional galls were also received from I. H. Evans, from 

 Austin, Texas. 



The fresh galls, as found at Washington, are yellowish-green 

 or slightly reddish, circular and bladder-like, from 2 to lo"""- in 

 diameter at the circumference, and from 2 to 7'""- vertically; they 

 are convex on both sides and situated either near the midrib or 

 between the transverse veins, and generally more prominent on 

 the upper side with a more or less distinct fovea or dimple about 

 the middle. There is a more or less central nipple or a trans- 

 verse slit on the under side, from which four to eight or more 

 depressed lines radiate towards the base, along which the gall 

 gradually splits into slender bracts in order to facilitate the escape 

 of the inhabitants. Both sides of the galls are pubescent, though 

 the under side is covered most densely with short, yellowish 

 hairs. 



The great majority of these galls contained, besides the stem- 

 mother, numerous eggs and pupae in various stages of develop- 

 ment, numbers of the true sexes, many of which were also 

 observed running about on the outside of the galls, and but one 

 or a few of the winged migrants. This leaves no doubt that 

 most of the sexes were the progeny of the pupae, whereas the few 

 migrants were destined to perpetuate their species on distant 

 trees. 



Stem-mother. — Length o.6"""-. Pyriform, broadest across 

 the thorax, tapering posteriorly and more slightly so towards the 

 head. The head is rounded in front and somewhat notched 

 about the middle. The entire insect is densely covered with 

 acute tubercles, intermixed with a few short hairs. The antenna 

 are short arid about one- fourth the length of the body; third 

 joint slightly clavate and sharply serrate; the sensorial thumb 

 is small and bordered at one side with three circular pores. Color 

 yellowish, eyes purple, legs blackish. 



Pupa.— Length about o.8"""-. Color pale orange or lemon 

 yellow, eyes dark brown, ocelli dark red; antennae, legs, wing- 



