the Orthoptera in the British Museum. 155 



median keel feeble, bifurcate in the basal third; two minute chiti- 

 nous points close to the keel beyond the middle ; the hind median 

 projection small, decurved, with a rather deep and sharp emargina- 

 tion at each side of its base. Cerci with the basal part thick, almost 

 horizontal ; the apical part vertical, longer than the basal part, 

 narrowed towards the obtuse apex, its fore inner margin somewhat 

 expanded, and the hind margin with a round expansion near the 

 base. Subgenital plate obtusely conical. 



General coloration brownish- grey, with indefinite brownish 

 markings. Elytra with rather large brownish spots. Wings 

 hyaline, Avith the veins in the fore part brownish. Hind femora 

 with indefinite dark spots on the upperside ; the inner side yelloAvish 

 (probably bleached) and almost wholly occupied by a black spot; 

 a narrow black ring on the inner side before the knee. Hind tibiae 

 yellowish. 



Length of body 20 mm. ; of pronotum 5-5 mm. ; of elytra 16 mm. ; 

 of hind femora 13 mm. 



British Museum specimen : S. Africa (A. Smith), 1 (^ 

 {one of Walker s types of C. crassus). 



The species, of course, has nothing to do with the true 

 C. (Rachitopsis) crasstis Walk., and even the coloration of 

 the hind femora does not agree with the Walker's description 

 of that species, 



2a. Platacanthoides bituberculatus var. attenuatus, n. var. 



cj. Differs from the type by the following characters : elytra 

 broader ; prosternal tubercle very slightly emarginate at the apex ; 

 tubercles of the supra-anal jDlate larger, acute; apical part of the 

 cerci more attenuate; the inner side of the hind femora black, 

 margined with red; lower outer sulcus yelloAv. 



Dimensions as m the typical form. 



British Museum specimen : Wepenor, Orange Free State 

 (Division of Entomology, Pretoria), 1 ^ {type of the variety). 



I do not think that the above-indicated characters are 

 of a specific value; the difference in the coloration of the 

 hind femora may depend on the type of the variety being 

 better preserved than that of the typical form which is 

 evidently much bleached. 



Martinezius, gen. nov. 

 Related to Plegmapterus M. Fern., but well distinct from it by 

 the practically smooth head and pronotum, as well as by the 

 developed lateral keels of the latter. 



