424 Annals of the South African Museum. 



PLATYSIAGON CAPICOLA, n. sp. 

 (PL XLII, figs. 5, 5a.) 



$ . A little smaller than my two male examples of P. signatus, but 

 of the same build. Smooth, shiiiy, head pale flavescent, with two 

 fuscous black bands on each side of the upper part of the vertex, both 

 meeting at the back part of the eye, the two median ones are prolonged 

 each in a short arcuate patch curving round the fastigium ; antennae 

 concolorous, but the first and second segments have a fuscous inner 

 patch, immediately above the labruni, each side of which is fuscous, 

 are two small central black patches ; the mandibles are the length 

 of the head, very robust, incurved, five and four dentate respectively, 

 at apex, and moderately compressed ; on the upper inner side of the 

 base starts a sub-cylindrical robust horizontal spine curving slightly in 

 the anterior third, and quite straight thence, sharp at apex, and 

 extending as far as the inner tooth of the mandible when the latter is 

 open ; proiiotum with two median broad longitudinal bands frayed 

 vertically on the sides in two vertical patches which do not reach the 

 margin ; abdominal segments light metallic brown, splashed with 

 somewhat seriated flavescent patches ; but the two basal segments are 

 only narrowly edged with brown, the greater part of the surface being 

 straw-colour ; posterior femora greatly dilated at the base, more or less 

 tessellated with fuscous brown ; anterior tibiae with one spine, some- 

 what median, on the upper side. 



This species thus differs from P. signatus in the shape of the 

 mandibles which, instead of being strongly dilated inwardly in the 

 shape of a sharply edged lamina sharply truncate at apex, have instead 

 a long, cylindrical, shai-ply acuminate projection nearly as long as the 

 greatly developed mandible, which is also not so conspicuously bent 

 inwardly from about the median part as in P. signatus, in which species 

 the labrum is broader at base. 



Length of body 22 mm. ; of mandibles 7 mm. ; of posterior femora 

 17 mm. ; of posterior tibiae 17 mm. 



Hab. Cape Province (East London). 1 $ . 



LIBANASIDUS, n. gen. 



Form massive. Head not broader than the pronotum, which, how- 

 ever, is broad ; fastigium of vertex much raised, very obtusely 

 triangular ; labrum very broad at base, much constricted laterally at 

 middle ; mandibles very robust, those of the <$ with a long, robust, 

 sharply acuminate, vertical process situated at about the median part ; 

 simple but equally robust in the female ; antennae twice the length of 



