Kinsey: The Genus Neuroterus 
59 
varieties of this species, extending its range over the whole 
of the United States. 
The monothalamous, rather separable gall, connects this 
species with saltatorius, and the insects of the two are so 
nearly alike that they can hardly be separated. Here is 
another case of physiologic species, and a rather remarkable 
instance inasmuch as the galls of the two are very distinct. 
When we have discovered a larger number of varieties of 
each species, we may be able to perceive the specific characters 
more clearly. 
Neuroterus (Diplobius) vernus Gillette 
Figures 17, 18, 20, 24-26 • 
FEMALE. — Cheeks of moderate width; eyes rather small, mesono- 
tum almost wholly smooth and shining; mesopleurse entirely but very 
finely roughened; abdomen about triangulate; legs brown, lighter at the 
joints and on the tarsi; wing veins light yellowish brown; areolet of 
moderate size or smaller; the first abscissa somewhat bent nearer the 
subcosta; length 0. 6-1.5 mm. (figs. 17, 20). 
MALE. — As described for the subgenus (fig. 18). 
GALL. — A slight, irregular swelling. Stem or leaf galls are poly- 
thalamous, with relatively few larval ceils, usually somewhat elongate, 
irregular in shape, not greatly increasing the size of the affected tis- 
sue, but often deforming the whole leaf or ament; covered with normal 
epidermal tissue, with sometimes some increase in pubescence; internally 
solid but largely occupied by larval cells. On ament stems, leaf petioles, 
leaf midveins, or young stems, or involving entire young growths from 
the buds. Anther galls are monothalamous, egg-shaped, thin-walled, 
hollow, small capsules. On white oaks and chestnut oaks (figs. 24-26). 
RANGE. — Massachusetts to Iowa and Texas. Probably thruout the 
eastern half of North America. 
This is, on a whole, a very primitive species, with the 
males as closely resembling the females as in any other species 
of the genus, the galls consisting of nothing but slight, un- 
specialized swellings of plant tissue; any young tissue is at- 
tacked by any insect without an exhibition of any developed 
choice of a particular part. The galls differ as different 
plant tissues are involved, several types of galls being pro- 
duced at times by a single variety. A remarkable variation 
of this gall polymorphism is recorded under variety exiguus. 
The alternate generations are very similar in regard to both 
insects and galls. Bisexual generations are known for all of 
the described varieties, and the agamic for two or three 
