Psepheninae

Arce-Pérez, Roberto, Shepard, William D. & Morón, Miguel A., 2012, Belicinus Rhomboideus, a new genus and species of Psepheninae (Coleoptera: Byrrhoidea: Psephenidae) from Belize, Zootaxa 3157, pp. 31-40 : 37

Key to New World Genera of Psepheninae Based on Adults

(Modified from Arce-Pérez 2004b)

1. Antennae long, filiform, extending notably beyond elytral humeri (Fig. 14); pro- and mesotarsomeres 1 and 2 much stouter than succeeding three and slightly emarginate at apex (Fig. 15)........................................... Pheneps

1' Antennae short, filiform, moniliform or subserrate, scarcely or not extending beyond elytral humeri; pro- and mesotarsomeres 1 and 2 of variable length but never stouter than following three tarsomeres....................................... 2

2. Tibiae slender, clearly arched (Fig. 5), with tiny teeth in their internal margin (Fig. 6); pronotum with a longitudinal glabrous line and a weak carina on the distal half ( Figs. 1 , 4)............................................ Belicinus , gen. nov.

2' Tibiae straight, without teeth; pronotum without a longitudinal glabrous line, with or without carina.................... 3

3. Pronotum with mid-dorsal longitudinal carina (Fig. 16)........................................................ 4

3' Pronotum without carina................................................................................ 5

4. Pronotum expanded laterally on posterior half, with a well-developed carina (Fig. 16); maxillary palpus short, last palpomere longest (Fig. 17); tarsomeres 1 and 2, and occasionally 3, with wide ventral expansions that cover apical tarsomeres (Fig. 19)............................................................................................ Psephenops

4' Pronotum with lateral margins rounded, not expanded on posterior half, with a feeble carina; maxillary palpus (Fig. 18) extremely long, second palpomere much longer than other palpomeres; tarsomeres with short ventral expansions that do not cover apical tarsomeres (Fig. 20)............................................................. Psephenopalpus

5. Tarsomeres 1–4 (Fig. 21) short, triangular, flattened, deeply emarginate for reception of following tarsomere; tarsomeres 1–2 with long ventral setae or papillae, those on 2 reaching base of fifth tarsomere.......................... Psephenotarsis

5' Tarsomeres 1–4 (Fig. 22) subconical and slender, scarcely emarginate at apex; tarsomeres 1–2 usually with ventral setae or papillae that never cover contiguous tarsomere...................................................... Psephenus

Figures

FIGURES 1 6. Belicinus rhomboideus sp. nov. 1. Head and pronotum, dosal view. 2. Head and prosternum, ventral view. 3. Labrum and maxillary palpus, ventral view. 4. Midline of pronotum with a fine carina in the distal half. 5 6. Protibiae slender, clearly arched toward the exterior, with tiny teeth on their internal margin.