Scarabseiclffi in the British, Museum. 511 



emavgination less deep, and consequently the two triangulav 

 teeth are less prominent. The elytra in C. peleus are dull, 

 but when examined by a magnifying-glass numerous minute 

 shining spots may be seen ; and as these are absent in C. 

 opacus the elytra are still more dull and are opaque even at 

 the suture near the scutellum ; the interstices are perfectly 

 flat, which they scarcely are in G. 2)eleiis, especially at the 

 sides. 



Possibly the male I have described may not be fully deve- 

 loped, and in that case the cephalic horn might be more like 

 that in C. peleus. 



A small male has only a light impression in the front of 

 the thorax. The female has no trace of impression. 



Cojjris megaceratoides^ sp. n. 



Griseo-niger, parum nitidus ; capita fortiter crebre punctato, antice 

 late leviter emargiuato, vertice cornu crasso, acurainato, cur- 

 vato ; thorace fortiter crebre punctato ; elytris tenuiter striatis, 

 striis distincte punctatis, iuterstitiis i^lanis, sat nitidis, sat crebre 

 sat fortiter punctatis ; tibiis anticis quadridcntatis, dento supe- 

 rior! parvo, tibiis posticis sat longo tridigitatis. 



(5 , Cajjitis cornu magno, compresso, fortiter punctato, pone medium 

 subito recurvo, basi bidenticulato, ad apicem subtus denticulato ; 

 thorace disco bene clevato, utrinque late leviter impreaso, parte 

 elevata in cornubus duobus acuminatis distantibns antice curvatis 

 partita, margine antico medio tubercuHs duobus iustructo, augulis 

 anticis sat porrectis acutis. 



Long. 10 lin. 



(5 , var. minor. Capitis cornu breviori, curvato, acuminato ; thorace 

 disco minus elevato, utrinque late impresso, parte elevata sub- 

 planata, subquadrata, antice emarginata, angulis obtusis, lateribus 

 cariniformibus, antice decHvi carinis duabus acutis instructa, 

 prope angulos anticos dente triangulari elevato instructo. 



Long. 9 lin. 



Ilab. Senegambia. 



1 have given the above name to this species on account of 

 the resemblance in general form of the cephalic and thoracic 

 horns to those of Megaceras chorinceus in the Dynastida3. 

 The thorax has an angle projecting forward rather beyond 

 the posterior lateral angle of tlic head ; the sides are some- 

 what straight anteriorly, and near the front angle there is an 

 acute ridge, which in the smaller male is developed into a 

 triangular tooth. In the large male there are two apj)roxi- 

 mate acute tubercles close to the front margin ; in the smaller 

 male these are much reduced and are connected by tvvo strong 

 ridges with the elevated tubercles on the disk. 



This species is nearly allied to C. ochiiSj Mots. 



