I 



i 



Classification of the Coleopterous family Dynastidm. 329 



Heteronychus sacchari, sp. n. 



Niger, nitidus, latus, sat convexus, capite rugoso, antice acute 

 bidentato, carina anteoculari medio late interrnpta ; prothorace basi 

 punctis anguste marginato, prseterea toto impunctato, angulis anticis 

 acutis, posticis obtusis ; sciitello parvo, vix pnnctato ; elytris brevi- 

 bus, post medium paulo ampliatis, lateribus apicibusque vix 

 perspiciie punctulatis, humerisque punctis nonnullis majoribus, 

 dorso striarum vestigiis subtilibus, toto impunctato ; propygidio 

 minute punctato, lineis stridulatoriis angustis, pygidio basi dense 

 rugoso, apice fere lawi ; tibiis anticis dentibus tribus validis acutis 

 aliisc[ue minutis armatis. 



Long. 17-19 mm. Lat. max. 11 mm. 



JIah. Bengal : Rungpur. 



Black, extremely smooth, and rather short and broad. 

 The head is rugose, with an inconspicuous carina before 

 the eyes, broadly interrupted in the middle. The clypeus 

 is produced into two rather sharp reflexed teeth. The 

 prothorax is closely punctured along the extreme posterior 

 margin, but is otherwise smooth : it is slightly narrowed in 

 front and regularly rounded at the sides, with the front 

 angles acute and the hind angles obtuse. The scutellum 

 is small and vaguely punctured at the base. The elytra 

 are short, widening a little behind the middle, with faint 

 traces of striae quite devoid of punctures. There are a very 

 few punctures at the shoulders and the outer margins are 

 very minutely punctulated behind. Tlie propygidium 

 is finely punctured and the stridulating files are narrow, 

 not reaching the hind margin. The pygidium is densely 

 rugose at the base and almost smooth on the apical half. 

 The front tibise have three strong acute teeth and inter- 

 mediate denticles. 



In the male the prothorax is rather longer relatively to 

 the elytra and the front tarsus and inner claw are only 

 moderately thickened. 



This species is reported as causing considerable injury 

 to sugar-cane. 



The most highly developed constituent of the Heterony- 

 chus group is one which has not at present been associated 

 with this group at all. It is the Scarahxus Itys, Oliv., 

 placed by Burmeister in his genus Stypotrupes, together 

 with two other species of very different type. Although 



