an African Beetle. 401 



of Macleay, G. GraUii and Daphnis of Buquet, Cetonia quad- 

 rimaculata of Olivier, and some other species, belong to the 

 genus Dicronorhina. These splendid beetles are highly pol- 

 ished, and have almost the lustre of glass. In the males, the 

 anterior edge of the square clypeus is produced, and ends 

 with a short recurved horn, which is bifid, or suddenly dilated 

 at the summit, in the form of the letter T ; the top of the 

 head is concave, with a sharp semicircular ridge overhanging 

 the middle ; the lateral angles of the clypeus are prominent, 

 and more or less elevated. The mesosternum is longer and 

 more acute than in Hegemon and Mecynorhina. The hind- 

 most tibiae, alone, are slightly fringed with hairs on the inner 

 side of the base. The anterior and intermediate tibiae are 

 not toothed or spined externally, in the males, and the former 

 have several very small denticulations, which are often obso- 

 lete, on the inner side. The forelegs of the female are three 

 toothed externally, and the four hinder tibiae are armed with 

 a single spine on the middle of the outer edge. The extrem- 

 ity of the abdomen is immaculate. By these characters alone 

 this subgenus may be distinguished easily from the following 

 one, and it approaches more nearly to the genus Coryphe of 

 Macleay. 



Scarabaus Polyphemus is the type of Mecynorhina, which 

 will also include the new West African species discovered by 

 Dr. Savage. The torquata* of Drury, the male of which was 

 first described and figured by Mr. Waterhouse,f in the year 

 1838, should be referred to the same subgenus. The opaque 

 and velvety substance, that covers the thorax and elytra, 

 the two whitish spots on the extremity (podex or pygidium) 

 of the abdomen, with the long-horned clypeus of the males, 

 give a peculiar aspect to these large and beautiful beetles. 



The head is quadrate, and more or less concave above, the 

 semicircular concavity extending backwards to the edge of 

 the thorax, in the males. In this sex the anterior margin of 



* This is Dairy's orthography ; the name is usually \iTitten torquaixis by other 

 entomologists. 

 t In Charlesworth's " Magazine of Natural History," Vol. II. p. 635. 



44 



