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Kinsey: Gall Wasp Genus Cynips
483
  Hypopygial spine very large, as high as long, extending dorsally as far as or further than ventrally (see figs. 217-224); wing-body ratio 1.50; cubital and discoidal cells always spotted; Pacific Coast species not known east of the Sierras.Subgenus Besbicus, 9
  Hypopygial spine usually more drawn-out and slender (broad in Philonix especially in short-winged forms), the normal wings 1.17 to 1.35 times the body length, but many forms with wings much reduced. Always east of the Sierras, from Mexico to southeastern Canada.3
3. Wing-body ratio normally 1.17, the wings without spots except for traces of a blotch in the cubitus; second abscissa of radius rather straight, radial cell rather long, wide; the normal spine rather broad but projecting basally; many forms with wings much reduced and the spine much broadened and abruptly truncate posteriorly. Agamic galls of moderate size or small, spherical; bisexual forms in seed-like cells in buds.Subgenus Philonix, 12
  Wing-body ratio normally 1.35; wings with spots and patches in many of the cells; second abscissa of radius well curved, radial cell usually short and broad (see figs. 266-273); the spine rather long and slender, not greatly widened (see figs. 276-286); the wings sometimes reduced. Agamic galls large, strictly spherical, smooth and naked “oak apples”; bisexual forms unknown.Subgenus Atrusca, 13.
  Wing-body ratio normally 1.30, wings largely clear or with smoky patches in the cubital cell; radial cell moderately long and not narrow (see figs. 345-368), normal spine rather slender plough-shaped (see figs. 386-406); or wings reduced, sometimes to mere stubs, and then the spine usually slender, blunt, of uniform width (see figs. 407-429); agamic galls more or less spherical, ellipsoid, or conical, naked, spiny, or woolly, usually thick-walled and compact crystalline internally in all species except mellea; bisexual forms in seed-like cells in buds.Subgenus Acraspis, 16

SUBGENUS CYNIPS

4. Agamic female with abdomen not more than half again as long as high, with tip of second segment approaching tip of abdomen dorsally; the central European varieties with the mesonotum largely punctate and hairy. Bisexual adults with mesonotum and mesopleura entirely smooth. Agamic galls spherical with considerable spongy tissue inside; bisexual galls seed-like, on twigs or older branches or the main trunk.5
  Agamic female with abdomen fully twice as long as high, with tip of second segment extending two-thirds or less to tip of abdomen; the Central European varieties with the mesonotum largely smooth