310 



DR. KNUD ANDERSEN ON BATS. 



[Apr. 7, 



the very broad skull (text-fig. 57 on p. 307) ; cusp 7 of m^ and m'-^ 

 are relatively large, as in A. toUecus, guadrivittatus and tuiyis ; 

 iQj absent (five skulls examined) ; facial stripes strong. But 

 A. namis is conspicuously smaller than A. turjns; so far as my 

 material goes, there seems to be a perfectly clear line of separation 

 between the two species; in the largest example (among 12 spe- 

 cimens and 5 skulls) of ^-1. nanus the skull is 1'3, the maxillary 

 tooth-row 0-6, the forearm 2-5, and the third metacarpal 2 mm. 

 shorter than in A. turpis. For further details see the table of 

 measurements, p. 309. 



Colour (adult skin ; Buena Vista, Yera Cruz ; U.S. IST. M. 

 no. 112791). — Upper side dark brown, with a tinge of drab; 

 under side broccoli- brown. Facial stripes strong. Conspicuous 

 light margins to the ears. No light tips to the wings. — A series 

 of alcoholic specimens are noticeably lighter-coloured ; in all the 

 facial stripes are very distinct ; the light ear-edgings sometimes 

 obsolete. 



Specimens examined. — 12 specimens (one skin) and 5 skulls, 

 from the following localities : — 



British Museum : — Gueri-ero : Tierra Colorada, Sierra Madre 

 del Sur (3). Sinaloa : Presidio, near Mazatlan (1). — 3 skulls, 

 representing both localities. 



U.S. National Museum*: — Colima : Hacienda Magdalena (7). 

 Yera Cruz : Buena Yista (1). — 2 skulls of adult specimens of the 

 series from Colima (the skull of the single example from Yera 

 Cruz has been lost). 



Range. — Mexico, as far north as Sinaloa. Sinaloa is the most 

 northern locality from which any species of Artibeus has been 

 recorded. 



Remarks. — The differences between A. nanus and A. phceotis 

 have been pointed out above, pp. 304-305. 



Wing-indices. 



* U.S. N. M. nos. 51765-67, 51771, 51773-74, 51776, 112791. 



