46 Mr. 0. Thomas 07i a new 



labium " of the flea represents the galea3, then the pseudo- 

 labium of the Diptera is formed in the same way, and yet we 

 have still four lancets in many Diptera to account for ! 



If, however, these lancets are the mandibles and maxillae, 

 then the sheath of the proboscis would be the labium ; and, 

 apart from its position, it is frequently divided into three 

 portions, very suggestive of the mentum, ligula, and para- 

 glossa3. 



I hope Prof. Lowne will some day give us a clearer idea of 

 what he considers these " parts of the maxillse " to be. 



When speaking of the mouth-parts of the flea, Prof. Lowne 

 incidentally mentions that the antenna in that insect is behind 

 the eye, which, he says, '' is a clear indication that the simple 

 eye in the Fleas is not homologous with the great compound 

 eyes of insects, which are never in front of the antenna3 " 

 (p. 152). When I read this sentence I could not help think- 

 ing of Prof. Lowne's statement above quoted (p. 129) that 

 position is no evidence ; and when one sees how completely 

 the relative position of the eye, ocellus, and antenna change 

 in such insects as Tryxalis and Fulgora for instance, I 

 scarcely think it a convincing argument to say that the eye 

 of the flea cannot represent the compound eye of other insects, 

 simply because it is in front of the antenna. A trifle more 

 and the antenna of Fulgora would be behind the eye. 



VI IT. — Descviptwn of a new Baboon from East Afinca. 

 By Oldfield Thomas. 



Among some ]\Jammals obtained by Mr. F. J. Jackson in 

 East Airica is a fine male Baboon evidently allied to the 

 Abyssinian Popio * thoth^ Ogilb. (with which I presume 

 P. doguera, Pucheran, is synonymous) , but so different from 

 it in the character and colouring of its fur that I think it ought 

 to be separated from it at least as a subspecies, for which I 

 propose the term 



* I am entirely unable to follow those naturalists who, in deliberate 

 defiance of the laws of priority, use Cpiocephalus instead of Papio for the 

 Baboons. Even on the inadmissible but oft-quoted score of convenience, 

 it is surely a oreater nuisance and source of confusion that some natu- 

 ralists or curators of large museums (e. y. the Leyden) should use Papio 

 and others Cynocephalus, than that those who are (and know they are) 

 wrong in using the latter should give it up once for all, and learn the 

 name which has an unquestionable claim to adoption. 



