250 MESSRS. C. J. GAHAN AND G. J. ARROW ON THE [NoV, 3, 



It can only be compared with C. decoratum Perty, these two 

 being the only forms with parti-coloured elytra, at least in the 

 noi'mal condition. In G. decaixotum, however, the elytra are not 

 coppery, and the posterior half is blue, while in the new species 

 it is green and is bounded anteriorly by a backwardly- curved 

 line. In 0. decoratimi the line of demarcation is angular, and 

 its projection is in the opposite direction, so that it almost 

 touches the base of the elytra at the suture. Tliis line is less 

 distinct in C. sladeni, owing to the deeper coppery-red colour of 

 the anterior half of the elyti'a and their more deeply- channelled 

 surface. The new sjDecies appears to be slightly smaller on the 

 average than C. decoratum, judging from the series of five speci- 

 mens of each in the British Museum. 



PiNOTUS ROBBRTI, Sp. n. 



P. Caroline atque eremitae valde affinis, sed pleritmqioe paullo 

 'major ; crassios, niger, p>ostiGe 2}lagis griseis decoratas ; capite 

 rttriusque sexus ut in P. eremita carinato, maris carince 

 angidis paidlo magis productts, thoracis loho mediano minus 

 qioadrato, leviter sidcato, sidci fmido absque stria, tubereulo 

 laterali minuto acuto, haud cariniformi. 

 Long. 27-32 mm. 

 Hah. Brazil : Cbapada, ParA. 



This is one of the small group of species in which the elytral 

 striae are posteriorly dilated and filled with a greyish earthy 

 secretion. It is very closely related to P. eremita Har., of 

 "Venezuela and Colombia, but the average size is rather lai-ger 

 and the thorax of the male shows slight differences of form. The 

 median lobe is more rounded, its lateral angles being hardly 

 traceable, and the longitudinal depression down its centre has no 

 definite stria at the bottom. Above the lateral fossa of the 

 thorax there is a short acute tubercle, which is represented in 

 P. eremita by an elongate crest. I am unable to compare the 

 female of P. roherti with that of P. eremita, the five specimens 

 of the latter in the British Museum being aU males ; but the 

 sexes of the new species differ extremely little. The head of the 

 female is more elongate and pointed, and there is a broad crest 

 very similar to that of the male but placed farther back. The 

 centre part of the prothorax is only slightly less prominent. 

 There is generally a trace of a median stria, and the tubercles 

 above the lateral fossae are not acute. The elytral furrows which 

 contain the remarkable earthy deposit are larger in the female 

 than in the male in this and the other species characterised by 

 this peculiarity. 



Mr. Robert found nine specimens of this species, among which 

 one only is a male. A second male from Par4 was confused with 

 our series of P. a^emita, so that the species is a fairly widely 

 distributed one. Its very close similarity to the more northern 

 form is no doubt the reason for its having hitherto escaped 

 detection. 



