Eurylychnus, Bates, 1891

Lay, Stuart, 2023, A taxonomic review of the Australian genus Eurylychnus Bates (Coleoptera: Carabidae: Broscini), Zootaxa 5330 (2), pp. 247-264 : 249

Key to the species of Eurylychnus

1 Pronotum with 3–5 setae on each side ( Fig. 6 ); males with squamose setae underneath protarsi on protarsomeres 1–3 ( Fig. 1A )................................................................................................ 2

- Pronotum with a single seta on each side; males without squamose setae underneath protarsi ( Fig. 1B ).................. 3

2 (1) Elytral striae 1–4 weakly to moderately defined; legs piceous; transverse impression behind the eyes impunctate; apex of aedeagus median lobe without a tooth ( Fig. 5F ) or with an obsolete tooth on the ventral side. Dorrigo, New England National Park, and Barrington Tops National Park (NSW)............................................ E. ovipennis Sloane

- Elytral striae 1–4 well defined; legs red; transverse impression behind the eyes punctate; apex of aedeagus median lobe with a distinctive broad tooth on ventral side ( Fig. 5C ). Wetter forests of south-eastern Australia, including New South Wales, Australian Capital Territory and Victoria ............................................. E. dyschirioides Castelnau

3 (1) Elytral surface smooth, glossy, striae obsolete; without reticulation of very fine meshes.............................. 4

- Elytral surface shiny or lustrous, striae well defined; with reticulation of very fine meshes at least apically............... 5

4 (3) Pronotum constricted in posterior 1/3, with sides slightly sinuate; pronotal foveae present. North-eastern Tasmania ............................................................................................ E. femoralis Sloane

- Pronotum not constricted posteriorly, sides straight before basal angles; pronotal foveae absent. Wilsons Promontory and Tarra Valley (VIC).......................................................................... E. kershawi Sloane

5 (3) Body size <14.2mm; parascutellar striole joined to apical portion of stria 1 ( Fig. 7B ); basal groove of elytra without obsolete punctures; ventrites 3–5 each with 2 setae. Otway Ranges and Mt Macedon (VIC)................... E. victoriae Sloane

- Body size> 16.5mm; parscutellar striole isolated from apical portion of stria 1 ( Fig. 7A ) (sometimes hard to see); basal groove of elytra usually with obsolete punctures; ventrites 3–5 lacking setae............................................ 6

6 (5) Elytra with 7 striae, striae 3 and 4 diverging basally; metatrochanters each with a seta. Wetter forests of south-eastern Australia, including New South Wales, Australian Capital Territory and Victoria .......................... E. blagravei Castelnau

- Elytra with 8 striae, striae 3 and 4 converging or sub-parallel basally; metatrochanters lacking setae.................... 7

7 (6) Elytral striae well defined, with striae 8 distinct. New England National Park (NSW)................. E. regularis Sloane

- Elytral striae weakly defined, with striae 8 faint. Barrington Tops National Park (NSW)............ E. cylindricus Sloane

Figures

FIGURE 1. Ventral surface of male protarsi of A, Eurylychnus dyschirioides; B, Eurylychnus cylindricus.

FIGURE 5. Male genitalia of Eurylychnus dyschirioides (A–C):A, left paramere, B, right paramere, C, median lobe left lateral; E. ovipennis (D–F): D, left paramere, E, right paramere, F, median lobe left lateral; E. kershawi (G–I): G, left paramere, H, right paramere, I, median lobe left lateral; E. femoralis (J–L): J, left paramere, K, right paramere, L, median lobe left lateral. Scale bars are 0.5mm.

FIGURE 6. Pronotum of Eurylychnus dyschirioides. PC = pronotal carina; PS = pronotal setae; MI = median impression; PF = pronotal fovea; PT = pronotal tubercle. Scalebar is 1mm.

FIGURE 7. A, Eurylychnus blagravei, with parascuttelar striole isolated from striae 1; B, Eurylychnus victoriae, with parascuttelar striole joined to apical portion of striae 1.