Litosomini

Anderson, Robert S., 2003, Neotropical Dryophthoridae: Redescription of the Genus Melchus Lacordaire with Description of Daisya Anderson, New Genus, and Seven New Species (Coleoptera: Curculionoidea), The Coleopterists Bulletin 57 (4), pp. 413-432 : 414-415

Key to Genera of Neotropical Litosomini

1 Size small, total body length less than 5 mm; tibia with distinct subapical tooth at inner angle in addition to larger curved tooth - - - - - - - - - - - - - - - - - - - - - Sitophilus Schoenherr

19 Size small to large, total body length greater than 5 mm and generally greater than 8 mm; tibia with either a small rounded subapical swelling or sharp subapical tooth at inner angle in addition to larger curved tooth - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2

2 Rostrum extremely long and slender, as long as length of pronotum and elytra combined; mandibles elongate subtriangular, with inner margins parallel-sided and lacking teeth, not touching medially; antenna with club with basal glabrous part with slender, stalk-like base, width at apex 3–4 times width at base; legs long and slender - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Toxorhinus Lacordaire

29 Rostrum various, but shorter than length of pronotum and elytra combined; mandibles small, convergent and occluding medially, with inner margins distinctly toothed; antenna with club with basal glabrous part with broad base, width at apex less than 3 times width at base; legs more robust - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3

3 Rostrum markedly laterally compressed in at least apical one-half; body form flat, maximum width greater than 1.35 times depth - - - - - - - - - - - - - - - - - - - - Melchus Lacordaire

39 Rostrum more or less cylindrical, not or slightly laterally compressed; body form thicker, maximum width less than 1.35 times depth - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

4 Elytra with scattered concentrations (nodules) of short erect setae, in some cases surrounded by dense micropilosity - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5

49 Elytra glabrous or with at most scattered, sparse setae or scales - - - - - - - - - - - - - - - - - - - - - - 6

5 Rostrum curved ventrally; antennal club with apical pilose part less than one-third length of basal glabrous part; pronotum and/or elytra with scattered patches (nodules) of micropilosity; male with front femur with distinct subapical swelling or tooth on inner margin - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Daisya Anderson

59 Rostrum straight; antennal club with apical pilose part obliquely oriented and appearing only as a narrow line; entire body uniformly covered with brownish matte coating; male with front femur without subapical swelling or tooth on inner margin - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Neophrynoides O’Brien and Wibmer

6 Rostrum curved ventrally; elytral striae impressed, intervals with single row of fine punctures; pronotum uniformly punctate - - - - - - - - - - - - - - - - - - - - - - Cosmopolites Chevrolat

69 Rostrum more or less straight; elytral striae very shallowly, indistinctly impressed, intervals impunctate; pronotum virtually impunctate - - - - - - - - - - - - - - - Eucalandra Faust