Coleopterous Siibfamily DyiiastinaB. 165 



a female from Dr. Sicard's collection. Except in the ante- 

 rior claws the sexes differ little, but the pygidium of the 

 female is less convex and less finely and evenly rugose than 

 that of the male. The prothorax has in both sexes a deep 

 median excavation which occupies nearly a third of the 

 breadth of the thorax and has its walls slightly acuminate on 

 each side in front. The elytra are deeply grooved, with 

 large annular punctures in the grooves and similar ones upon 

 some of the interstices^ which are broader and less elevated 

 than the rest. The metasternum is less densely hairy than 

 that of H. sulcicolUs, Fairm., but much more so than in the 

 following species. 



Hovophileurus canaliculatus, sp. n. 



Niger, parum nitidus aut convesas, abdomine fusco-rufo. corpor© 

 subtus parcissime hirsuto ; capite leviter ruguloso, antice acute 

 producto, vertice medio tiiberculato ; pronoto toto fortiter sat 

 crebre puuctato, lateribus valde arcuatis, angulis anticis acutis,. 

 posticis obtusis sed bene indicatis, medio profunde et anguste 

 canaliculato ; scutello grosse puuctato ; elytris toto rugose punc- 

 tulatis, profunde striatis, striis plus minusve creuatis, interstitio 

 secundo antice et postice, 4° postice, 6" toto grosse seriatim, 8° et 

 10" irregulariter punctatis, apicibus planatis, grosse et crobre 

 punctatis, metasterni lateribus crebre punctatis, parce pilosis : 

 pygidio dense rugoso. 



Long. 19 mm. ; lat. max. 9 mm, 



Hab. N. Madagascar : Diego Suarez. 



The only specimen I have seen is a female in the British 

 Museum. The prothorax has only a narrow median groove, 

 its posterior angles are well-marked, the elytra have a close 

 microscopic puuctulation which produces a less shining 

 appearance than that of the other two species, and the lower 

 surface is only very scantily clothed with hair. 



Pentodon australis, Blackb., cannot be allowed to remain 

 in that essentially Palaearctic genus, to which its relationship 

 is rather remote. It has the aspect and general characters 

 of Heteronychus, from which it differs in the absence of 

 stridulatoiy strije upon the propygidium. Its nearest ally 

 seems to be Heteronychus australis, Fauvel, described many 

 years earlier from the female alone and inhabiting New 

 Caledonia. The two species agree in having the glossy 

 un punctured pronotum, the thickened front tarsi in the male 

 and other features of Heteronychus, as well as in the want of 



