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are polythalamous swellings packed with larval cells, while 
in the second instance they are single, scattered larval cells 
which produce almost no swelling. So does the plant tissue 
determine the character of the gall! It might be suggested 
that the two insects, altho alike moi-phologically, are different 
physiologically as evidenced by their different points of 
oviposition, but such matters cannot be investigated with our 
present means. Meanwhile it appears probable that insects 
from either type of agamic gall lay eggs for either type of 
bisexual gall, apparently due to the lack of a peculiar physi- 
ology which might restrict oviposition to a single point on 
the plant. 
Neuroterus qiiercicola variety pubescens, new variety 
agamic form 
FEMALE. — Basal segments of the antennss light brownish rufous; 
the legs light brownish yellow; the areolet very small to closed; length 
1. 5-1.7 mm. 
GALL. — As described for the species. A moderate-sized mid-vein 
or petiole swelling, woody, packed densely with larval cells, covered with 
a bluish gray, dense, short pubescence; on leaves of Quercus grisea. 
RANGE. — Arizona: Globe, Safford. Probably confined to the moun- 
tain country just south of the Colorado Plateau. 
TYPES. — 5 females, 11 galls. Holotype female, paratype female, 
and galls at The American Museum of Natural History; paratype fe- 
males and galls in the Kinsey collection; paratype galls at the U.S. 
National Museum, the Museum of Comparative Zoology, and the Phil- 
adelphia Academy. Labelled Globe, Arizona; January 20, 1920; Q. 
grisea; Kinsey collector. 
This gall is rather distinct from others of the species in its 
coat of bluish gray pubescence. It is of interest as an agamic 
generation in a leaf gall; the only other agamic form known 
inhabits twigs or acorns, but the evergreen leaf of the host of 
the present variety allows the fall and winter form to survive 
on the leaf. This form may also occur in twigs with or with- 
out producing a gall. The bisexual form probably occurs in 
a similar gall on the leaf. 
Neuroterus quercicola variety quercicola Dalla Torre 
bisexual form 
Neuroterus yolitus Bassett, 1890, Trans. Amer. Ent. Soc., XVII, p. 89. 
Thompson, 1915, Amer. Ins. Galls, pp. 13, 41. Cresson, 1923, Trans. 
Amer. Ent. Soc., XLVIII, p. 201. 
