Descriptions of Ne-w or Little-known Orthoptera. 417 



tibiae have two median spines, the intermediate two on the outer and 

 three on the inner margin ; the hind tibiae are one-fourth shorter than 

 the femora, somewhat robust, and plainly incurved near the apex. 



Length of body 28 mm. ; of mandible 6 mm. ; of posterior femur 

 15 mm. 



Very different in general appearance from its congeneric species N. 

 truncatifrons. The head, although large, is not as greatly developed, 

 there is no tubercle whatever on the forehead, but the shape of the 

 mandibles is the same, and the spines on the fore and intermediate tibiae, 

 as well as the conical supra-anal lamina, are as in N. truncatifrons. 



Hob. Cape Province (Vryburg District), J. M. Bain. 1 $ . 



NASIDIUS MONACHUS, u. sp. 



$ . Very near N. mimus, but the colouring is different. The whole 

 body and legs are shiny black, the vertex only is flavescent, with the 

 genae and the whole tuberculated clypeus ferruginous red. Much 

 smaller than N. mimus, and distinguished by the much more deeply 

 vaulted clypeal part, which is developed in a triangular process over- 

 hanging the base of the clypeus the genae are not as deeply corru- 

 gated ; the fore tibiae have each two spines in the upper median part. 



Length of body 21 inni. ; of mandibles 7 mm. ; of hind femora and 

 tibiae 14 mm. 



Hab. Southern Rhodesia (between the Limpopo and the Zambesi), 

 T. Ayres. 1 J . 



NASIDIUS FEROX, n. sp. 



? . Metallic flavescent with the prothorax fuscous in the centre, the 

 hind border of all the segments more or less narrowly fuscous ; head 

 very robust, frontal part distinctly produced owing to a deep depres- 

 sion in front of the antennae into a broad raised triangle, the apex of 

 which is the continuation of the fastigiuni, the outer angle of the 

 clypeus is sub-dentate ; the anterior tibiae have each two long spines 

 in the inner part of the upper side in addition to the apical one ; the 

 spines of the intermediate and posterior tibiae are strongly developed ; 

 the ovipositor is somewhat short, and upcurved. 



Closely allied to the ? of N. mimus, but the head is more massive, 

 and the triangular raised part of the irons is more distinct ; the legs 

 are a little more robust, the hind femora are broader, and the spines 

 of the legs are more robust ; the ovipositor is also slightly shorter. 



Length of body 38 mm. ; of proiiotuin 8 mm. ; of hind femora 

 21 mm. ; of hind tibiae 19 mm. ; of ovipositor 6 mm. 



Hab. Southern Rhodesia (Motoppoes), R. Pillaus. 



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