Pogonostoma (Pogonostoma) srnkai, W. Horn, 1893

Moravec, Jiří, Wiesner, Jürgen & Jocque, Merlijn, 2022, New or rare Madagascar tiger beetles- 26. A new species ofthe genus Pogonostoma Klug from northwestern Madagascar and a revised key to the Pogonostoma (P.) srnkai species-group (Coleoptera: Cicindelidae), Zootaxa 5169 (2), pp. 165-176 : 167-168

Pogonostoma (Pogonostoma) srnkai species-group

Identification. In the concept presented in the monograph of the genus ( Moravec 2007) and maintained here, this species-group accommodates species with more subtile body (not exceeding 12.6 mm in length) than those of Pogonostoma (P.) subtile species-group, and possessing moderately or more distinctly gradually dilated apex of lacinia (inner margin not arcuate-convex). Pronotal disc elongate with almost parallel or only moderately convex lateral margins. Elytral punctation more or less effaced on elytral base, juxtasutural areas and posterior declivity, or also on posterolateral areas; elytral discal impression notably deep. Terminal teeth of mandibles (in male) shorter than those in P. (P.) subtile species-group (never distinctly inward-recurved). Aedeagus apex rounded, only in one species hooked (but not thinly uncinate).

Revised key to species of Pogonostoma (P.) srnkai species-group

1 Femoral apices and basal areas of tibiae yellow-testaceous. Pronotal disc markedly elongate-cylindric with almost parallel lateral margins. Aedeagus apex hooked...................... P. (P.) mahimborondrense Moravec & Wiesner sp. nov.

– All leg segments black (faded to black-brown in old specimens). Pronotal disc cylindric but notably much wider. Aedeagus never hooked........................................................................................ 2

2 External tooth of elytral apex notably protruding and thorn-like in both sexes; inner tooth thorn-like in male, triangular in female. Elytral punctation effaced on basal and narrow juxtasutural areas. Apex of lacinia wider than in other species. Aedeagus bent in middle, apex blunt............................................... P. (P.) externespinosum W. Horn, 1927

– External tooth of elytral apex normally shaped, small, pointed in male, blunt in female. Elytral punctation effaced on notably large or only limited areas. Aedeagus apex with apical portion almost straight or bent dorsad......................... 3

3 Elytral punctures more spaced with large, notably smooth and shiny areas on elytral base, discal impression, elytral disc and posterior declivity. Surface of pronotal disc shallowly striate-rugose, shiny. Labrum 6–9-setose. Apical portion of aedeagus turned ventrad................................................................ P. (P.) srnkai W. Horn, 1893

– Elytral punctation coarse and deep, effaced in much less extent on basal and juxtasutural area only. Surface of pronotal disc with more distinct sculpture. Apical portion of aedeagus never bent ventrad........................................... 4

4 Dorsal surface of metatibiae densely covered with microtrichia on their apical half. Surface of pronotal disc finely striate-rugulose on large median area, notopleural sutures barely obvious in dorsal view. Antennae in female shorter than body. Labrum 6–8-setose (with 5–6 anterior setae). Aedeagus apex slightly dorsad-bent and emarginated, blunt................................................................................................. P. (P.) impressum Rivalier, 1970

– Dorsal surface of metatibiae well obvious through sparse microtrichia. Surface of pronotal disc coarsely cristulate-rugose, posterior parts of notopleural sutures clearly obvious in dorsal view. Antennae in both sexes longer than body. Labrum 5–7-setose (with 4–5 anterior setae). Aedeagus with almost straight and regularly conical-constricted, rounded apex....................................................................................... P. (P.) subgibbosum Moravec, 2000