Pfcerocyon, Rousettus, a id Mjonycteris. 505 



River, Millsbury, Liberia; type in the Leyden Museum. 

 Chief characters, according to Jentink : postcanine teeth ^ ; 

 second digit without chiw. But the rest of the descrip- 

 tion and all the measurements are sufficient evidence that 

 L. Blittikoferi was based on a Pt. helvus. It is important to 

 note that the skull was not extracted from the specimen (I 

 conclude from the fact that it is not recorded in Jentink's 

 Catalogue of osteological specimens in the Leyden Museum) ; 

 the small posterior upper molar {m?) can therefore easily have 

 been overlooked ; in aged individuals with much worn teeth 

 it is not rarely lost. The lack of a claw to the index-finger 

 must be fortuitous or an individual abnormality. 



3. Pterocyon sabceus^ sp. n. 



Differs from Pt. helvus in the following particulars : — 

 Skull smaller ; total length (one male ad., six females ad.) 

 51*5— 55 mm., against 54*5-62'2 in Pt. helvus (nineteen males 

 ad., twelve females ad.) ; maxillary tooth-row (c-m^) 19"2- 

 20*8, against 21-23'5; cranial rostrum slenderer; posterior 

 premolar and molars, above and below, markedly broader 

 than in the larger-skulled Pt. helvus. The external dimen- 

 sions average slightly smaller. 



Range. — S. Arabia (Lahej, Aden). 



Type. — ? ad., skin and skull. Lahej, Aden ; Aug. 19th, 

 1899. Collected by Mr. Dodson. British Museum, no. 

 99. li. 6. 3. 



II. ROUSETTUS, Gray. „ 



' '' Type. 



1821. Ronsettus, Gray, London Medical Reposi- 

 tory, XV. p. 299 (Apr. 1, 1821) R. cegijptiacus. 



1829. Cercopteropus, Burnott, Quart. Joum. Sci. 



Lit. Art, xxvii. p. 269 R. (Bgyptiacus. 



1843. Eleutherura, Ciray, List Mamm. B. M. 

 p. xix. Nomen nudum. 



1843. Xantharpyia, Gray, List Mamm. B. M. 



pp. xix, 37 R. amplexicaudatus. 



1844. Eleutherura, Grav, Voyage ' ^Sulphur,' i. 



p. 29 ■ R. Leachi. 



18.52. Cynnnycteris, Peters, Reise Mossamb., 



Zool. i., Saugeth. p. 25 R. Leachi. 



1870. Senonyderis, Gray, Cat. Monk. &c. p. 115. R. seminudtis. 



Basicranial axis considerably deflected : alveolar line pro- 

 jected backward passing through upper part of occipital 

 condyle (minimum of deflection) or through base of zygoma 

 (maximum). Front of orbit vertically above posterior half 

 or middle of wi\ Tympanic not produced into a bony 

 Ann. (& Mag. N. Hist. Ser. 7. Vol. xix. 35 



