Mr. G. J. Arrow on the Genus Rhyaoclos. 8.5 



exaratut, Serv. 



titnerictinitii, Lap. 



tnaldbaikuH, sp. ii. 



guadniticol/is, sp. u. 



'I'aprohanfn, Fuiriii. 



nijiofietmig, Lewis. 



Hoy si, sp. n. 

 Head with lateral lobes approximating bebiud only, tuhtrricvps, Fainn. 



bucculatiis, sp. II. 

 Head with lateral lobos approximating in the 



middle anyuliceps, sp. n. 



Head with lateral lobes fused with median eleva- 

 tion pensus, Broun. 



Rhysodes ar/udtus, sp. n. 



Cylindricus, piceus, parum nitidus ; capite post ociilos supra et sub- 

 tu8 utrinque producto, lobis posterioribus vcrtice biapproximatis, 

 parcissime punctatis, spatio anteriore elevato brevi, medio cou- 

 stricto ; prothorace elongate, antice semicirculariter arcuate, 

 postice vix contracto, lateribus medio fere rectis, disco trisulcato, 

 Bulcis exteniis latis, carinis 4 fere parallelis, mediis 2 autice et 

 postice jungcntibus ; elytris late punctato-striatis ; corpore subtus 

 grossissime punctate ; tibiis anticis apice bidentatis, dente tertio 

 raediano post apicem. 

 c? , tibiarum anticarum dente quarto paulo post medium feraori- 

 busque anticis medio dentatis, tibiis intermediis et posticis apice 

 lamella longe bispinosa munitis. 



Long. 7'5-9 mm. 



Hah. Andanoan and Nicobar Islands. 



The specimens were collected by tlie late Mr, Roep.^torflf. 



Thi.s sj)t'cies is very closely related to IL atrahus, Newin., 

 of which the type is in the British Museum, but may be 

 distinguished by its rather longer and more parallel-sided 

 prothoiax and the coarser punctation in the elytral striuB. 

 These two species, together with IL crass iuscul us, Lewis, 

 differ from all others known to me by the remarkable arma- 

 ture of the legs of the male, as well as by the {)erforation at 

 the back of the head, which is very small and punctilbrm 

 and distant from the median elevation. There are also punc- 

 tures upon the smooth parts of the head and thorax, which 

 are characteristic of this small group. 



B. m'cvharensis, Grouv., which inhabits the .■same islands 

 as B. ar7)ia(uSj has a very diflerent head, the median elevation 

 extending into the posterior perforation, which is ver^' large. 



Rhysudes ma^aicus, sp. n. 



Niger, nitidus, elongatus, capitis lobis prorainentibus, supra paulo 

 distantibus, antice ct postice lovilor convergentibus, spatio mcdiano 



