Perigona, Serrano & Capela & Santos, 2017

Serrano, Artur R. M., Capela, Rúben A. & Santos, Carmen Van-Dúnem Neto, 2017, Biodiversity and notes on carabid beetles from Angola with description of new taxa (Coleoptera: Carabidae), Zootaxa 4353 (2), pp. 201-256 : 232

Key to the African Perigona (s.str.) species

For identification, a new key of the nominate subgenus Perigona Laporte de Castelnau s. str. is provided that is modified from the keys to the African species by Baehr (2004) and Serrano (2008).

1. Elytra narrow and elongate,>1.4x as long as wide, subparallel; pronotum narrow, not cordiform, widest diameter less close to apex; eyes large and prominent; macropterous, with elongate metepisternum (c. 3x as long as wide), aedeagus with shorter apex............................................................................................... 2

- Elytra wide and short, <1.3x as long as wide, laterally convex; pronotum fairly wide, subcordiform, widest diameter close to apex; eyes smaller and little prominent; brachypterous, with short metepisternum (c. 1.5x as long as wide); aedeagus with elongate apex ( Fig. 5d in Basilewsky 1989). Central Africa..................................... nigrociliata Basilewsky

2. Smaller species, length <3.9 mm; elytra either uniformly dark yellowish to light brown, or not either uniformly of the same color; terminal abdominal sternite in both sexes with fringe of short hairs; aedeagus short and stout, with rather thin apex of variable length ( Fig. 1 in Baehr 2004).................................................................... 3

- Larger species, length> 4.6 mm; elytra black with light sutural stripe that is enlarged behind middle to a wide spot; terminal abdominal sternite only in female with fringe of short hairs; aedeagus elongate and more depressed, with short, thick apex ( Fig. 5c in Basilewsky 1989). Eastern Central Africa............................................ mediornata Basilewsky

3. Elytra and pronotum uniformly dark yellowish to light brown.................................................. 4

- Elytra not uniformly of the same color..................................................................... 5

4. Smaller species, length <2.7 mm; pronotum narrower, little narrowed towards base, lateral margin not sinuate near base, anterior angles not produced; aedeagus with fairly elongate apex ( Fig. 5b in Basilewsky 1989). West Africa.... pallida Castelnau

- Larger species, length> 3.25 mm; pronotum wider, with narrower base, lateral margin gently sinuate near base, anterior angles slightly produced; aedeagus with very short apex ( Fig. 5a in Basilewsky 1989). Tropical Africa from Senegal to Mozambique..................................................................................... parallela Chaudoir

5. Elytra and pronotum reddish-brown dark or lighter.......................................................... 6

- Elytra black with narrow reddish sutural stripe; pronotum black, sometimes with indistinct dark reddish discal spot; anterior sclerite in internal sac large, characteristically dentate at upper margin ( Fig. 1 in Baehr 2004,). Zambia, southern Africa. ............................................................................................. wachteli Baehr

6. Elytra reddish-brown dark with light sutural stripe, enlarged behind middle to apex; pronotum reddish-brown dark homogeneous; Elytrae less long (1.50–1.60 times longer than wide); Aedeagus with short apex ( Fig. 3 in Serrano 2008). Príncipe Island, Golf of Guinea................................................................... principensis Serrano

- Elytra reddish-brown lighter than pronotum, sutural stripe slightly darker; Elitrae slightly longer (1.61–1.62 times longer than wide). Aedeagus with fairly elongate apex ( Figs 2a, c , this work). Angola............................ liboloensis sp. n.

Figures

FIGURE 1. Facies of:a) Perigona liboloensis sp. n. male holotype, b) Lasiocera schuelei sp. n. male holotype.

FIGURE 2. Perigona liboloensis sp. n.: a) Aedeagus, median lobe and parameres (left lateral view), b) apex of median lobe (dorsal view), c) median lobe (right lateral view) and, d) genital ring.

FIGURE 3. Perigona liboloensis sp. n., female genitalia: stylomeres 1 and 2 (ventral view).

FIGURE 5. Lasiocera schuelei sp. n., Aedeagus: a) Median lobe and parameres (left lateral view), b) apex of median lobe (dorsal view).