1901.] LEMUR MONGOZ AND L. EUBRIVENTEE. 255 



sex has beeu wrongly indicated in the plates 156, 157, and 162, 

 just as in Sdater's figures. 



From the descriptions by Griinther, 8chlegel, Milne-Edwards 

 and Oustalet, and from Grandidier's plates, we learn that, apart 

 from the very characteristic coloration of the throat and front, 

 diiferent in both sexes, the colour of the skin varies to some extent, 

 although on the whole the males are more reddish, the females 

 more greyish. 



Von Lorenz describes our species from specimens collected by 

 Dr. Voeltzkow at Kandani and Autema, near Bembatoka Bay, 

 the same district whence the Leyden specimens were obtained. 

 Although the description is given under the heading " L. alhi- 

 DuiHus,'" the writer states expressly that he inclines to agree with 

 Scblegel and Sclater in assuming that the appropriate name is 

 L. mougoz L. Yon Lorenz also records that, out of twenty 

 individuals, two females approached to the colorotion of the males, 

 and vice versa one male had a grey head \ 



I trust that by the foregoing quotations the synonymy of 

 L. mongoz L., placed at the heading, has been justified, aud that 

 its outer characters have been abundantly pointed out. 



It is a matter of considerable difficulty to find out the proper 

 name for the one species with which the Lemur mongoz L. is 

 generally confused. Scblegel adopted for it the name Lemur 

 collaris Greoff., but the descriptions of the older writers are mostly 

 insufficient, so that, if the types are not forthcoming, the matter 

 will never be satisfactorily settled. All I wish to say for the 

 present on this subject, with which I am not directly concerned 

 here, is, that there exists in Madagascar and the Comoros a wide- 

 spread species, varying considerably in the colour of its skin, but 

 constant in some cranial features of easy observation, which last 

 will be described farther on. To this species, besides the name 

 L. mongoz, the following names have been applied at one time or 

 other : — Lemur albifrons, L. anjuanensis, L. bruneiis, L. collaris, 

 L. falvus, L. tnayottensis, L. nigrifrons, L. riififrons, L. rufus, 

 Prosimia melanocephala and Prosimia xanthomystax. L. fulvus 

 E. Geoffr. S.-H. has the priority, and I therefore adopt this 

 name. 



Oranial Characters. 



Lemur mongoz has the smallest skull of all the species of the 

 genus, L. coronatus not excepted. Assuming that Edwards's 

 specimen was adult, the dimension assigned to it, " less than 

 a small cat," would be appropriate. As observed by F. Cuvier 

 and von Lorenz, the facial cranium is short for a species of 

 Lemur ; it approaches in this character the L. rubriventer. 



Von Lorenz has figured the skull in the side view, which he 

 describes as follows : " Die Stirne ist infolge der stark entwickelten 

 Sinus frontales weit vorgewiilbt und von der Nasenwurzel 



^ Abb. Seiickenb, naturf. Ges. xxi. iii. p. 450 (1898). 



