Kinsey: The Genus Neuroterus 
41 
was quoted as a definite observation by Beutenmuller, but I 
can count only 13 in my material, and this is the number 
normal for all speces of this submenus. 
Neuroterus (Diplobius) niger Gillette 
Figures 6, 7, 34, 35, 39, 42, 43 
FEMALE. — Cheeks narrow, eyes rather large; mesonotum and 
mesopleurag largely smooth; abdomen rather small, but a little larger 
than the thorax, a little longer than high, more rounded than triangu- 
late, not produced either dorsally or ventrally; legs yellowish at the 
joints and on the tarsi; areolet of moderate size or smaller; the first 
abscissa more or less angulate; length 0. 6-1.0 mm. (fig. 6). 
MALE. — As described for the subgenus (fig. 7). 
GALL. — A small, blister-like swelling in the leaf-blade. “Mono- 
thalamous’’, or at least each gall containing a single cell; sometimes two 
or more cells partially fused. Entirely inseparable from and very 
largely buried in the lamina of the leaf, the boundaries of the gall 
sometimes definite, sometimes very indefinite; on deciduous-leaved oaks 
the gall is usually less evident on the under surface of the leaf where 
there is only a slight swelling, the upper surface more defined and more 
elevated; the reverse is usually true of the evergreen oaks. Circular to 
elongate oval, from 0.7 to 1.7 mm. in diameter, the surface smooth and 
naked as the surface of the leaf. Internally entirely hollow, with a dis- 
tinct and mostly inseparable lining. On leaves of probably every North 
American species of white oak (figs. 34, 35, 39, 42, 43). 
RANGE. — Massachusetts to Texas and California. Probably 
thruout the Americas wherever white oaks occur. 
This gall is not especially noticeable, but it does occur 
in great abundance- All species of white oaks, whether de- 
ciduous or evergreen, are affected. Usually a distinct variety 
occurs on each host in each faunal area, so there may be 
about 110 varieties in the United States. In addition to the 
nine varieties treated here, I have galls from Quercus 
chrysoleyis and Q. dumosa in southern California, Q. chry- 
solepis in northern California, Q. lobata and Q. Douglasii in 
central California, Q. ohlongifolia in southern Arizona, and 
from Q. alba and Q. macrocarpa in Massachusetts. These 
undoubtedly represent six undescribed varieties, which is still 
only a small sampling of the species ! The varieties differ in 
only a few, well-defined respects, but there can be no excuse 
for not recognizing them. Four of them have previously 
been described as distinct species. 
Four bisexual and six agamic forms of this species are 
