492 Transactions SoutJi African Philosophical Society, [vol. xii. 



Sub-Family HYBOSOEINiE. 



Mandibles not quite covered by the labrum ; labial palpigers very 

 greatly developed, antennae ten-jointed; middle coxae oblique and 

 approximate ; epimera of metathorax small but visible ; abdomen 

 six-jointed, the apical joint alone free ; elytra covering the pygidium ; 

 anterior tibiae bi- or tri-dentate outwardly and serrulate. 



Key to the Genera. 



A-. Posterior tibiee dilated and excavated outwardly, outer 

 margin dentate. 



Anterior tibiae three-dentate, apical spur nearly straight ; 



elytra multi-striate, and with distinct epipleura Hyhosorus. 



Anterior tibiae bi-dentate, apical spur very long and curving 



outwards ; elytra granulose, faintly striate, no epipleura .. Chatocanthus. 



A'. Posterior tibise not dilated and not excavate. 



Anterior tibiae weakly bi-dentate, apical spur moderately 

 long and slender, posterior tarsi nearly as long as the 

 tibise, claw long, slender Phceocroiis. 



Gen. HYBOSOEUS, McLeay, 



Hor., Entom., i., 1819, p. 120. 



Mentum sub-quadrate but w^ith the basal angles a little rounded, 

 slightly emarginate at tip, and with the palpigers quadrate and 

 very greatly developed, being nearly one-third of the width of 

 the mentum, second joint of labial palpi swollen and of about 

 the same length as the basal one, apical one longer than the 

 second, slightly swollen at base, and sub- cylindrical from there, 

 ligula membranaceous, bi-lobate, briefly ciliate internally at tip, and 

 long; maxillae moderately short, massive, deeply emarginate out- 

 wardly, apical lobe ciliate, not dentate, inner one somewhat slender, 

 briefly ciliate and horny at tip, but not dentate ; antennae ten- jointed, 

 basal joint short, swollen, second one globular, club tri-jointed, with 

 the inner joint very concave and also a little larger than the other 

 two ; mandibles not hidden by the labrum, strongly arcuate, sharp at 

 tip, but not dentate inwardly ; eyes divided in front by the canthus 

 of the genae, but not deeply, and showing less on the upper than on 

 the under side ; head and prothorax simple, the latter diagonally 

 attenuate laterally from the sharp anterior angle to the posterior 



