Eucriotettix ridleyi Günther, 1938

Tan, Ming Kai, Storozhenko, Sergey Yu, Hwang, Wei Song & Meier, Rudolf, 2017, Integrative taxonomy reveals two sympatric species of the genus Eucriotettix Hebard, 1930 (Orthoptera: Tetrigidae), Zootaxa 4268 (3), pp. 377-394 : 387

Eucriotettix ridleyi Günther, 1938

Eucriotettix ridleyi Günther, 1938: 173 (holotype—male, Singapore; deposited in BMNH, London); Stenmann, 1970: 224; Blackith & Blackith, 1987: 3; Blackith, 1992: 60; Zheng, 2005: 96, 453; Deng et al., 2012: 489; Li et al., 2014: 2085.

Material examined. No specimen was examined by us, but the holotype was examined and images provided by Robin Ngiam. The comparison of the photographs ( Figs. 7 A–C) with original description based on the holotype only ( Günther, 1938) allow us to add some important characters in the diagnosis of this species.

Differential diagnosis. Vertex 1.4 times narrower than one eye seen from above. Antennal socket situated between the lower margins of eyes. External lateral carina of pronotum distinctly raised, infrascapular area broadened ( Fig. 7 А). Lower side of the lateral lobes of pronotum deeply excised behind triangularly pointed projection ( Fig. 7 B). Hind femur 3.2 times as long as wide. Eucriotettix ridleyi is similar to E. grandis (Hancock, 1912) and E. dohertyi (Hancock 1915) , sharing the absence of a long spine on lower side of the pronotal lobes and the posterior pronotal process reaching two thirds of hind tibiae. E. ridleyi differs from E. grandis in the external lateral carina of pronotum (in E. grandis these carina almost straight) while the shape of lower side of pronotum is the same in both species and differs from E. doherty (in latter species the lower side almost quadrate, obliquely truncate posteriorly and gently notched). The differences of E. ridleyi from Singaporean congeners are given in a key above.

Measurements (in mm). Length of male pronotum 11.1; width of pronotum between shoulders 2.5, length of hind femur 5.1 (after Günther, 1938).

Distribution. Singapore, China (Yunnan, Hubei), Indonesia (Sulawesi).

Figures

FIGURE 7. Holotype of Eucriotettix ridleyi body in dorsal (A) and lateral (B) views; (C) labels. Image by Robin Ngiam.