Monograph of the genus Curculio in the New World (Coleoptera: Curculionidae). Part I. United States and Canada. By Gibson, L.P., Miscellaneous Publications of the Entomological Society of America 6(5): 271-273, 1969
Curculio quercusgriseae (Chittenden)
Balaninus q.-griseae Chittenden 1908a: 22.
Balaninus proprius Casey 1910: 121.
Curculio q.-griseae (Chittenden). Chittenden 1927: 168.
General Features.—Shape ovoid in dorsal view, elongate-ovoid in lateral view ; length 5.0-7.5, width 2.5-3.7; body red to dark reddish-brown; antennae and legs similar to body in color but tending to be lighter ; punctures on prothorax frequently without distinct sides, size fairly uniform, uniformly spaced ; round and deep in elytral stria; on metasternum smaller than on prothorax and shallower ; vestiture varying from moderate to dense, from silvery white to deep golden ; usually with darker fasciae on elytra; dorsum of prothorax usually with an indistinct broad darker stripe longitudinally on each side of an indistinct median light line, laterally bordered by an indistinct light stripe; underside of body uniformly covered with silvery-white scales. Squamules on pro-thorax hairlike, nearly 8 times longer than wide except in lateral stripe, where they are the same length but slightly wider, squamules variable on various areas of elytra, those in darker areas 6-8 times longer than wide, lighter squamules nearly same length but wider ; squamules on ventral and lateral areas variable, most 2-3 times longer than wide and ⅔ as long as those on dorsal surface, becoming longer and more hairlike toward rear of abdomen, especially on 4th and 5th abdominal sterna of male, those on legs hair-like.
Recognition Characters.—Femoral teeth large; silver colored ventrally, golden dorsally, with silver fasciae on elytra; rostrum abruptly inserted, female rostrum ⅗ as long as body.
Head.—Rounded; punctures round, shallow, smaller than on prothorax with sides less distinct, punctuation not extending onto base of female rostrum, extending lightly to antennal insertion on male rostrum; vestiture not extending onto base of female rostrum, ⅓ distance to antennal insertion in male; rostrum abruptly inserted into frons in male and female, slightly or not thickened at base in male, not thickened at base in female, of uniform size throughout; female rostrum usually gently arcuate to near apex, occasionally straight to near apex then strongly arcuate, increasingly arcuate in apical half in gently arcuate rostra, male rostrum arcuate throughout; female rostrum slightly over ⅗ as long as body, male rostrum slightly less than ½ as long as body; antennal insertion 1.25 mm from base in 7 mm specimens; antennal scape in male as long as 4 or 5 funicular segments; funicular segment 1 longer than 2, segments 2-5 successfully shorter, segments 5-7 similar in length, shorter than 4, segments 8 and 9 similar in length, segments 10 and 11 successfully shorter, club oval. Length of mandibles equal to width of apex of rostrum. Eyes nearly circular; female eye gently convex. Interocular pit obsolete in male and in female.
Prothorax.—Slightly wider than long, constricted in apical ⅓ ; midventral surface ⅔ as long as dorsal surface in female, 0.7 as long as dorsal surface in male; dorsal surface arcuate.
Elytra and Scutellum.—Elongate ovate-acuminate, 3/10 wider than prothorax, 0.8 as wide as long. Scutellum small; scutellar pit usually indistinguishable; scutellum densely covered with scales, not raised above elytra at sides of scutellar pit.
Ventral Surface.—Mesosternal intercoxal process slightly prominent; metasternum evenly covered with scales except in small area in distal part of ventral line; abdominal sterna 1 and 2 flattened to slightly concave in male, flattened to slightly convex in female; sternum 2 as long as 5 in female and male, sterna 2 and 5; 3 and 4 subequal in length, sternum 2 longer than 3; sternum 5 concave in middle ⅓ in female, flat to slightly concave in middle ⅓ in male.
Legs.—Femora attaining apex of elytra moderately clavate, teeth large with acute reentrant angles, usually without differentiation into denticles; hind tibia arcuate; prouncus and mesouncus small, metauncus absent in female, prouncus, mesouncus and metauncus moderate in male.
Pygidium.—Extending to apex of elytra, usually not beyond; male densely covered with long hairs extending beyond elytra, female usually with no long hairs.
Aedeagus.—Medium lobe elongate; 3.5 times as long as wide, sides oval to near apex, tip arcuately curved downward, apex coniform in front view, dorsal area membranous.
Types.—Of q.-griseae, holotype, female, Ft. Grant, Ariz. In USNM, Type no. 11555.
Of Proprius, holotype, female, no locality label. In USNM, Type no. 35024.
Distribution.—Central and southern Arizona, south into northcentral Sonora, Mex. Total specimens examined: 409.