Psephenops, Grouvelle, 1898

Novelo-Gutiérrez, Rodolfo, 2017, Two new species of Psephenops Grouvelle (Coleoptera: Byrrhoidea: Psephenidae) from Panama, Zootaxa 4323 (1), pp. 109-118 : 117-118

Key to adult males of Psephenops from Mesoamerica

(Modified from Arce- Pérez & Novelo-Gutiérrez 2013)

1 Pronotum with 3 small tuberculiform prominences; elytra with several longitudinal ridges on disc............... grouvellei

- Pronotum without tuberculiform prominences, elytra without longitudinal ridges on disc............................. 2

2 Protibiae with a denticle................................................................................ 3

- Protibiae without a denticle........................................................................ prestone

3 Tarsal lobes enlarged ( Fig. 17 )........................................................................... 4

- Tarsal lobes short ( Fig. 18 )............................................................................. 5

4 Basal half of parameres, in dorsal view, separated by a deep cleft ( Fig. 5 )......................................... 7

- Basal half of parameres, in dorsal view, fused ( Fig. 13 )........................................................ 9

5 Parameres truncated ( Fig. 19 ); 4th maxillary palpomere at least twice as long as preceding palpomeres.............. s mithi

- Parameres not truncated; 4th maxillary palpomere not as above.................................................. 6

6 Parameres strongly convergent on apical third, medial margin of each paramere separate each other by a narrow, drop-like cleft ( Fig. 20 )......................................................................................... lupita

- Parameres more or less parallel on apical third, medial margin of each paramere separate each other by a wide, U-shaped cleft ( Fig. 21 )....................................................................................... shepardi

7 Apices of parameres, in dorsal view, spine-like, widely divergent ( Fig. 22 ).............................. spiniparameri

- Apices of parameres, in dorsal view, convergent, not spine-like ( Figs 20, 21 )...................................... 8

8 Prosternal process flat, with apex lanceolate. Penis with a small, lateral tooth ( Fig. 23 )....................... mexicanus

- Prosternal process subcylindrical, with apex bifid. Penis lacking lateral projections ( Fig. 5 )...................... bifidus

9 Small individuals, length less than 2.4 mm, antennae moniliform-serrate, parameres truncate, with apex straight ( Fig. 24 ).............................................................................................. panamaensis

- Large individuals, length greater than 2.5 mm, antennae not serrate, parameres not truncate.......................... 10

10 Antennae long, filiform; fore- and middle legs with segments 1 and 2 lobulate, hind legs only with segment 1 lobulate (Haiti)............................................................................................. haitianus

- Antennae short, moniliform; all legs with segments 1 and 2 lobulate............................................ 11

11 Elytra slightly striate. Parameres, in dorsal view abruptly widened on apical fifth, with apex rounded; penis digitiform and y slightly produced apically ( Fig. 25 ).............................................................. maculicollis

- Elytra smooth. Parameres, in dorsal view, uniformly widened, apex subtriangular; penis digitiform, not produced apically, with a basal, lateral, subtriangular projection to each side ( Fig. 13 ).......................................... triangularis

Figures

FIGURES 17 – 25. Hind tarsi of Psephenops spp., dorsolateral view. 17) P. spiniparameri; 18) P. shepardi. Male genitalia of Psephenops spp. occurring in Mesoamerica, dorsal view. 19) P. smithi; 20) P. lupita; 21) P. shepardi; 22) P. spiniparameri, 23) P. mexicanus; 24) P. panamaensis; 25) P. maculicollis. Figs 17 – 18, 21 – 22 after Arce-Pérez & Novelo-Guriérrez (2013); Fig. 9 modified from Deléve (1967); Fig. 23 after Arce-Pérez & Novelo-Gutiérrez (2010); Fig. 24 after Arce-Pérez & Novelo- Guriérrez (2015); Fig. 16 modified from Spangler (1990).

FIGURES 5 – 8. Psephenops bifidus sp. nov., male genitalia: 5) dorsal; 6) ventral; 7) lateral; 8) ventrolateral. Scale bar = 0.14 mm.

FIGURES 13 – 16. Psephenops triangularis sp. nov., male genitalia: 13) dorsal; 14) ventral; 15) lateral; 16) ventrolateral. Scale bar = 0.12 mm.