162 Mr. G. J. Arrow on the 



c? > P3'gi^io modice convexo, nudo, eubtiliter coriaceo : pedis antici 



ungue interno basi dentato : 

 5 , pygidio deplanato, transverse striolato et parce irregulariter 



punctato, punctis setiferis. 

 Long. 29-32 mm. ; lat. max, 15-16 mm. 



Hab. S. Nigeria : Calabar, Ga}300ii. 



The species was found by Du Chaillu in the Gaboon 

 region and has been more recently taken by Col. F. AVinn 

 Sampson. It is the largest known to me and of a deep red 

 colour, all the others being black. There is no trace of 

 depression or tubercles behind the front margin of the pro- 

 notum. The punctures of the elytra are large and annular, 

 and the intervening spaces are finely, but quite distinctly, 

 punctiilated. The outer margins are rather irregularly 

 dotted -oith fine punctures only. 



The inner claw of the front tarsus of the male of this 

 species bears a small tooth beneath. The sexes also differ in 

 the pygidium, -which is more flattened and pointed in the 

 female and transversely striolated, with scattered punctures 

 bearing short erect setae, while in the male it is convex, bare, 

 and coriaceous. 



Prionoryctes caniculus, sp. n. 



Elongatus, niger, nitidus, corpore subtus breviter rufo-hireuto, 

 capite omnino rugoso, fronte medio leviter impressa, tuberculis 

 duobus sat remotis instructa ; pronoto toto marginato, grosse 

 punctato, medii postice punctis paulo magis subtilibus, ante 

 marginem anticnm tuberculis duobus conuatis fere obsoletis 

 instructo ; scutello leviter punctato; elytris grosse pnnctatis, lineis 

 quatuorgcminatisstriaqucsuturali profunda, interstitiis sat crebre 

 marginibusque osteriiis crcberrime punctulatis : 



J , pygidio convexo, nudo, subtiliter coriaceo. 



Long. 28 mm. ; lat. max. 13*5 mm. 



Hab. S. Nigeria : Calabar. 



A single male specimen has been presented by Col. F. 

 Winn Sampson to the British iMuseum. It has the form 

 but not the colour of P. rnfopiceus, and is also differently 

 punctured. The lines of large punctures upon the elytra 

 arc stronger and deeper, and the microscopic punctulation 

 of the surface between the punctures at the lateral and 

 apical margins is finer and closer. It is also distinguishable 

 by the vestiges of a pair of tubercles behind the front 

 margin of the proiiotuni, but there is no punctured de- 

 pression as described in P. capreo/us, Qucd., nor is there a 

 smooth median line extending to the posterior margin. The 



