266 Mr. G. J. Arrow on LamelUcorn Beetles 



Oiiychionyx opac'ipennis^ sp. n. 



riceus, subcylindricus, iiitidus, elytris opacis, humeris exceptis; 

 clypeo sat crebre puuctato, fronte miuus crebre ; pronoto convexo, 

 minute et parce ii)sequaliter puuctato, lateribus paulo fortius, 

 angulis obtusis, lateribus medio paulo contractis ; scutello elytris- 

 que irregularitor auuulato-puuctatis ; pygidio nitido, modice 

 crebre puuctato : 



c? , pj-gidio subtus reflexo. 



Loug. 29-33 mm. ; lat. max. 15-17 mm. 



Hob. Dutch New Guinea : Mt. Goliath, 5000-7000 feet 

 {A, S. Meek). 



This is another of the curiously isolated but yet inter- 

 related forms of Dynastinse which characterize the Papuan 

 Region, and of whose probably peculiar habits we as yet 

 know nothing. It is remarivable in the absence of hair, and 

 especially of the bristly hairs upon the legs which form a 

 rather constant feature of the subfamily. The two sexes are 

 almost identical, there are no elevations or depressions upon 

 the head or thorax, and the front feet are neither elongated 

 nor thickened in the male. The front tibia bears three sharp 

 external teeth placed close together, and each of the four 

 posterior tibia3 also bears three sharp spines externally, the 

 last at the extremity. The tarsi are simple and similar on all 

 the legs, and neither spinose nor bristly, and the claws are 

 strongly curved and not at all divergent, so that the two tips 

 are close together. The onychiuni is strongly developed, 

 not setose at the end, and has a corresponding curvature to 

 that of the claws, so that the extremities of all three are 

 almost in contact, an arrangement which I have seen in no 

 other beetle. 



It is more nearly related to Hatamus than to any other 

 known genus, but differs greatly in its massive build, the 

 absence of hair from the legs and lower surface, the abnormal 

 claw-structure, the form of the tibise and tarsi, the similarity 

 of the sexes, and other important points. 



The Australian Dynastinee are very imperfectly known at 

 present. Many species described by Boisduval, Guerin, 

 Macleay and others, are still unrecognizable, and Blackburn 

 has tiusted to very speculative determinations of them in 

 describing the numerous species for which he is responsible, 

 and of which some are based upon female specimens or males 

 of poor development. The fixation of many of the earlier- 

 described forms is likely to remain long a matter of uncer- 

 tainty, but_, Blackburn's types having now become part of 



