Subfamily Silvaninae

Parasilvanus Grouvelle, 1912Antennal segment 8 much narrower than and obviously different from 7 [Abb. 1]; temple well-defined. Apical segment of labial palp smaller than previous segment [Abb. 2]; apex of prosternal process only slightly broader than apex of mesosternum [Abb. 3]. Habitus [Abb. 4] [Abb. 5]. Ethiopian.

→ 2-Antennal segment 8 not much narrower than 7, usually similar to it; temple well- to ill-defined or absent.

Protosilvanus GrouvelleElytral stria 7 moderately to strongly carinate; prosternal process and labial palps as in Parasilvanus; antennae may have spines on margins of segments 9 and 10 [Abb. 6]. Oriental.

→ 3-Elytral stria 7 not carinate; apex of prosternal process much broader than apex of mesosternum [Abb. 7]; apical segment of labial palp larger than previous segment [Abb. 8]; antennae without spines.

Silvanoides Halstead, 1973Eyes large; temple forming a narrow shelf for eye [Abb. 9]; puncturation much coarser on pronotum than on head; anterior angles of pronotum little produced, lateral; cuticle shining; femoral lines open (see below); ♂ genitalia with parameres as in [Abb. 10]. Oriental.

→ 4-Eye and temple form not as above, without other characters combined.

Cathartosilvanus GrouvelleFemoral lines open, i.e. diverging from margin of metacoxal cavities [Abb. 11]; anterior margin of pronotum with lateral thirds or less, obviously sloped backwards to anterior angles [Abb. 12]. ♂ genitalia, aedeagus with median lobe rounded to very slightly tapered at apex, parameres elongate with long setae, not forked at apex [Abb. 13]. Nearctic and Neotropical.

→ 5-Femoral lines closed, i.e. forming margin of metacoxal cavities [Abb. 7]; anterior margin of pronotum not as above.

Calpus Halstead, 1973Genae prominent laterally, triangular; anterior angles of pronotum strongly produced anteriorly, anterior margin concave [Abb. 14]. ♂ genitalia as or similar to [Abb. 15], parameres rather spatulate at apex; ♂ sternites 8 and 9 as in [Abb. 16]. New Guinea and New Ireland.

→ 6-Genae not prominent laterally; if anterior angles of pronotum concave on anterior margin, then only moderately produced anteriorly.

Pensus Halstead, 1973Pronotum as in [Abb. 17], with side margin usually slightly convex where it forms anterior angle; head and pronotum dull, puncturation dense, setiferous punctures ocellate; elytral epipleura with a high inner rim; ♂ genitalia, apex of median lobe extremely broad, parameres as in [Abb. 18]. Nearctic and Neotropical.

Silvanus Latr.-Pronotum not as above; head and pronotum dull or shining, setiferous punctures not or slightly ocellate; elytral epipleura without a high inner rim; ♂ genitalia, apex of median lobe not extremely broad, parameres forked at apex [Abb. 19]. World.