Kinsey : Gall Wasp Genus Cynips 
315 
wide and well defined to the pronotum (except occasionally in unica) ; 
anterior parallel and lateral lines absent or more or less obscurely de- 
fined; median groove absent or evident; scutellum rugose to sculptured, 
in most varieties more or less raised along a median line which may 
become a fine ridge anteriorly, the foveal depression smooth to rugose 
at bottom; mesopleura in large part smooth and shining with some 
punctation and hairs; abdomen of normal size (long- winged forms) or 
enlarged (in short-winged forms), largely naked; legs largely rufous, 
the tarsal claws much broadened basally but nearly simple in some 
varieties, more nearly toothed in the larger insects; wings long, about 
1.30 times the body length, with a complete venation; or wings very 
much reduced and with remnants of the venation; in the long wings 
there is a prominent infuscation at the base of the radial cell (over the 
first abscissa of the radius and the terminal portion of the subcosta), 
the areolet is small to very large, there is an infuscation at the union 
of the cubitus and the basalis and one at the break in the discoideus, 
and the cubital cell is without clouded patches or spots; the insect is 1.8 
to 4.5 mm. in length. 
GALL. — A small, globular, thick-walled leaf gall with the larval 
cell filling most of the interior. Monothalamous ; strictly spherical when 
fresh and sometimes when dried after maturity, often shrinking irregu- 
larly when dried; the gall sometimes drawn out at the point of attach- 
ment; the surface of the gall roughly, irregularly shagreened, densely 
covered with long, white or brown hairs when young (at least in some 
varieties), the hairs deciduous, leaving a stellate pubescence on older 
galls; the galls of all varieties finally naked (altho still appearing 
puberulent because of the shagreened surface; the naked galls whitish, 
FIG. 50. SUMMARY MAP, VARIETIES OF CYNIPS MELLEA 
Each insect geographically isolated or on distinct hosts. Areas of transition and 
hybridization not shown. 
