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Indiana University Studies 
Riley recorded this insect emerging in April and early 
May, and Cook added that the galls form in late summer, so 
the insect overwinters in the galls. This is in agreement 
with the occurrence of other agamic forms in the genus. The 
alternate generation will be very similar, the insect possibly 
a little smaller, the galls smaller and on younger twigs, begin- 
ning growth in May, with the insects emerging in June or 
July. 
Neuroterus rileyi variety thompsoni Kinsey 
bisexual form 
Neuroterus rileyi Thompson, 1915 (in part), Amer. Ins. Galls, pp. 7, 
41, pi. 3, fig. 173. 
Neuroterus thompsoni Kinsey, 1920, Bull. Amer. Mus. Nat. Hist., XLIl, 
p. 301, pi. XXI, figs. 8, 9. 
FEMALE. — Antennae basally light yellow; the thorax laterally 
piceous brown; the abdomen piceous brown; the legs brownish yellow, 
only slightly browner on the femora and the hind tibiae; the areolet 
of moderate size or smaller; the length 1.5-1. 7 mm. 
MALE. — As described for the species. 
GALL. — -As described for the species; small, the swelling elevated 
above the stem, raising the bark to 1.0 mm. On younger twigs of 
Quercus prinoides. 
RAN GE. — Massachusetts. 
TYPES. — 23 females, 2 males, and 6 galls. Holotype female, para- 
type females, male, and gall in the Boston Society of Natural History; 
paratype females, male, and galls in the Kinsey collection; paratype 
females and gall at The American Museum of Natural History, the 
U.S. National Museum, and in the W. T. Davis collection; paratype 
gall at the Philadelphia Academy. Labelled Massachusetts; Q. prin- 
oides; Thompson collection number 173. 
Thompson stated that these galls form in May. This 
is a bisexual generation, and adults, if typical for this genus, 
would develop very quickly, emerging before midsummer. We 
do not have the emergence date for this material, but it is 
probably June or early July. The agamic generation would 
form after mid-summer and emerge early in the following 
spring, as for variety rileyi. 
Neuroterus rileyi variety virgens Gillette 
agamic form 
Neuroterus virgens Gillette, 1893, Ent. News, IV, p. 166. Dalla Torre 
and Kieffer, 1902, Gen. Ins. Hymen. Cynip., p. 52; 1910, Das Tier- 
