1902.] Catalogue of the Coleoptera of South Africa. 691 



strongly pronounced diagonal round costa reaching from the 

 humeral to the apical callus ; the pygidium is vertical or slightly 

 flexed forwards ; the abdominal segments are much compressed 

 laterally ; the pectus is very hairy, and the propygidium and the 

 abdominal segments are completely or partly scaly ; inner claw of 

 the anterior tarsi cleft in the middle, outer claw basal and quite 

 rudimentary, claws of the intermediate and posterior legs simple 

 and single ; anterior tibiae strongly tri-dentate, the teeth about equi- 

 distant ; posterior femora and tibiae enormously developed in the 

 male, and with the inner angle, and sometimes the outer [crassipes) 

 produced into a long, acute, or pluri-dentate process ; in this sex the 

 joints of the hind tarsi are very short and not free. 



The insects included in this genus are far from common. They 

 are, I believe, as a rule, crepuscular or nocturnal, although I am 

 informed that H. arviata has been caught on the wing in the 

 afternoon. I have found it, and also H. crassipes, on a sultry 

 morning, crawling on the ground. H. auriventris I have never 

 caught flying in the daytime, and most of my examples were found 

 by me, either dead or nearly so, but still limp, and in the act of 

 being di'agged by ants to their nests. 



The genus is strictly South African, and seems to be restricted to 

 the Cape Colony ; it includes eight species. 



Keij to the Species. 



A-. Posterior tibiae of the male with a terminal spur. 



B=. Prothorax very deeply grooved in the centre. 



Apical inner part of posterior femora produced into a very 

 long, sharp, arcuate process : 



Head with a bifid frontal tubercle in the male . . . . hylax. 



Head with a non-bifid frontal tubercle spectahilig. 



Head without a frontal tubercle koikoina. 



B'. Prothorax not deeply grooved in the centre. 

 a-. Head with a small tubercle. 



Apical inner part of posterior tibite slightly produced into 



a short process tri-dentate at tip, hind femora simple . . aiirirentris. 



Apical inner part of posterior tibias produced into a long 



process tri-dentate at tip, hind femora dentate tinnata. 



a\ Head without tubercle. 



Apical inner part of posterior tibiae moderately long, 



bifid at tip and strongly tri-dentate on each side.. .. mutira. 



