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Indiana University Studies 
and naked. Bisexual adults (known for divisa only) with mesonotum 
roughened anteriorly about parapsidal grooves, the mesopleura with 
a limited rough spot. Agamic galls spherical, ellipsoid, or elongate 
club-shaped with very little spongy material inside; bisexual gall 
(known for divisa only) an irregularly restricted or subdivided cell 
attached to the edge of a leaf or rarely in buds or on young shoots. 
6 
Agamic female with abdomen not more than half again as long 
as high, with tip of second segment extending three-quarters of 
way to tip; the mesonotum in part punctate and hairy with a 
large, smooth and naked area. Agamic gall spherical to ellipsoid 
with almost no spongy tissue inside. Bisexual forms unknown. 
C. agama 
5. Agamic female of Central Europe with thorax robust and scutellum 
rugose, as much so anteriorly as posteriorly; northern European 
insects with mesonotum smooth. Bisexual females with legs bright, 
clear yellow. Agamic galls soft, sometimes spotted but not banded; 
bisexual galls with a shorter purplish or reddish pubescence when 
fresh. C. folii, 5a 
5a. Agamic female largely rufous and piceous, mesonotum heavily 
punctate and hairy; scutellum as rugose anteriorly as poster- 
iorly; length 2.8 to 4.0 mm. Agamic galls up to 30.0 mm. in 
diameter, spongy, shrivelling, becoming russet brown. Bisex- 
ual form as in next variety. Central European. var. folii 
Agamic female largely rufous; mesonotum moderately punctate 
and hairy; scutellum smoother anteriorly than posteriorly; 
length 3.0 to 4.4 mm. Agamic gall up to 10.0 mm. in diameter, 
less spongy, not shrivelling, remaining light brown. Bisexual 
form as in above variety. Mediterranean Europe. 
var. flosculi 
Similar to above. On Q. Ilex in Spain. var. ilicicola 
Agamic female almost entirely black; mesonotum largely smooth 
and naked; scutellum as rugose anteriorly as posteriorly; 
length 2.1 to 2.7 mm. Agamic galls spongy, shrivelling, be- 
coming russet brown. Bisexual form not known. 
var. atrifolii 
Agamic female in Central Europe with thorax rather slender and 
with scutellum smoother especially anteriorly; northern Euro- 
pean insects with mesonotum coriaceous or shagreened in places. 
Bisexual females with legs duller yellow with femora more or less 
piceous. Agamic galls prominently banded brown-purple. Bisexual 
galls with a longer, gray pubescence. C. longiventris, 5b 
