462 Mr. Gilbert J. Arrow's Classification of 



Didymus carnifex, Kuw. I have identified this species, 

 of which the habitat is quoted by Kuwert as " Gaboon ? " 

 in a form collected at Kavirondo, British E. Africa. I 

 have seen a series of specimens which are interesting as 

 uniting Kuwert's genera Didynuis and Eumelosomus. In 

 some specimens there are two quite distinct teeth at the 

 middle of the clypeal margin, while in one they are very 

 closely approximated and in others actually form a single 

 median tooth, which may or may not be minutely bifid at 

 the end. I have not noticed similar variation in other 

 species, but it is evident that Kuwert has attached undue 

 importance to this feature and that, failing other means 

 of differentiation, Eumelosomus cannot be retained as a 

 distinct genus. The present species seems to be most 

 closely related to D. {Eumelosomus) Iclugi, Kaup. 



Didymus curvilineatus, sp. n. 



Moclice elongatus, depressus, capite vix distincte punctato, clypeo 

 valde 4-dentato, medio vix emarginato, carinis frontalibus antice 

 parallelis, postice acute convergentibus, cornu obtuso, postice sulcato, 

 tuberculis lateralibus globosis ; prothoracis lateribus fortiter arcuatis 

 haud crebre, postice pares, punctatis, angulis anticis paulo productis, 

 acutis ; scutello impunctato ; elytris profunde striatis, striis dorsali- 

 bus minute, lateralibus scalariforme, punctatis ; mesosterno utrinque 

 longe et profunde fossulato, metasterni postice medio et lateribus 

 punctatis : abdominis segmentis omnibus lateraliter subtilissime 

 rugosis. 



Long. 26-27 mm. 



Hab. Beit. E. Africa, Kavirondo, Msozi (Uganda). 



This is a rather broad and flat species, with the elytra 

 conspicuously widening behind, so that the discoidal strise 

 are strongly curved. The lateral interstices and their 

 connecting rods are narrow, but less so than in the 

 following species. The head is rather smooth and shining, 

 without any coarse punctures. The frontal carinse are 

 angulated behind the middle, where there is a tubercle, 

 being nearly parallel in front of this and converging 

 behind to an acute angle. There is a patch of punctures 

 at the middle of the posterior part of the metasternum 

 and a patch of larger punctures on each side. The 

 abdomen is finely punctured at the sides and at the 

 extreme apex of the terminal segment. 



