810 AUSTRALIAN COLEOPTERA, WITH DESCRIPTIONS OF NEW SPECIES, 



linear and sharply cut, the outer more obscure and foveiiorm. 

 On the elytra the 5th, 6th, and 7th striae from the suture are 

 progressively fainter than the preceding four, so that the 7th 

 (though traceable throughout with a good lens) is extremely faint ; 

 in the apical 6th part of the elytra these are as strongly marked 

 as the inner strise, the 5th being at the extreme base also not 

 much feebler than the 4th. The clearly-definei sulcus on the 

 external side of the hind tarsi is a conspicuous character. The 

 prosternum is not margined between the anterior coxae. None of 

 the elytral interstices except the 9th are convex unless slightly so 

 close to the apex. The puncturation of the 9th interstice resembles 

 the same in R. llopleura. The sculptuie of the prosternal 

 episterna is very strong. 



The species of this genus (or subgenus) are very close to each 

 other and difficult to identify. The Baron de Chaudoir has 

 described one as having the sides of the prothorax not sinuate 

 behind {R. liopleura), and named three other species without 

 describing them (merely pointing out some differences from 

 liopleura in respect of two, and from one of those two in respect 

 ot the third). The Count de Castlenau has also described most of 

 these under different names from those of de Chaudoir, but his 

 descriptions are of little value, the type of the genus which he 

 used for comparison with other species having been stated by 

 de Chaudoir to have been wrongly named. The insect I have 

 just described differs from the description of liopleura (and from 

 specimens which I believe to be that insect) in having the hind 

 angles of tie prothorax not in the smallest degree dentate, and 

 the two basal sulci of the same not placed in an excavation, in the 

 external sulcation of the hind tarsi (de Chaudoir gives as a generic 

 character " hind tarsi generally not sulcate," and does not mention 

 liopleura as forming an exception), and in the very much more 

 slender antennae and tarsi. From R. Icevilatera, R. sulcatipes differs 

 inter alia in not having the otii, 6th, and 7th striae on the elytra 

 *' altogether obliterated ;" from R. cyathodera in not having the 

 thorax " much wider and shorter (than that of liopleura) ;" a,nd 

 from R. rnisera in being very much larger, with elytra differently 

 striated, &c. 



