308 BR. KNUD ANDERSEN ON BATS. [Apr. 7, 



particulai-ly in aged individuals, there is a tendency to flattening 

 of the rostrum and vaulting of the brain-case; in A. tur2ns and 

 otanus (text-fig. 57) this tendency has been carried to an ex- 

 treme, and at the same time the rostrvim is bent slightly upward ; 

 probably as a consequence of this latter, the bony palate has 

 become shortened. These are the chief peculiarities of A. turjns 

 and nanus as compared with A. ioltecus and quadriviUatus. 



Skull (compare text-fig. 57, of A. nmnis). — Short and broad, 

 as in ^. toUecus and quadriviUatus. Rostrum more depressed 

 and brain-case more vaulted than usual in the genus. Rostrum 

 with a slight, but distinct, upward trend, the alveolar border 

 of the maxillary bone, therefore, in profile more abruptly 

 ascending ; in ^ . toUectis (text-fig. 58) the profile of the nasal 

 bones is slightly descending rather than horizontal, in A. turpis 

 it is slightly ascending. Bony palate shortened ; in A . toltecus 

 (as in all the foregoing species of the genus, with exception 

 of the short-faced A. concolor) the length of the palate, from 

 palation to posterior border of incisive foramina, is larger than 

 (extremely rarely almost equal to) the length of the post- 

 palatal portion of the skull, from palation to basion ; in ^. tmyis 

 the bony palate is shorter than the post-palatal portion. 



Teeth. — As in A. toUecus and qvadrivittatus. Cusp 7 of m^ 

 large ; cusp 7 of m" conspicuous, shelf -like, projecting. 



In the nose-leaves, ears, wing-structure (see wing-indices, 

 p. 310), and hairing on tibia and interfemoral, A. turpis does not 

 diflfer appreciably from A . toltecus. 



Colour ( $ ad., presei'ved in alcohol ; teeth almost unworn ; 

 type of species). — General colour of upper side approaching 

 Front's brown, but with a distinct tinge of drab ; base of hairs on 

 hinder back almost wood-brown, on the neck and shoulder region 

 ecru-drab ; under side light wood-brown. Facial stripes strong. 

 Narrow light margins to the ears. No white tij)s to the wings. — 

 The general colour of this specimen has probably not remained 

 quite uninfluenced by the preserving-fluid. 



Ifeasui'eonents. — On p. 309. 



Specimens examined. — One adult female, Teapa, Tabasco, S. 

 Mexico; with skull; the type; British Museum. 



Range. — As yet only known from the type specimen described 

 above. 



Artibeus nanus K. And. 



1906. Artiheus nanus Knud Andersen, Ann. & Mag. N. H. (7) xviii. p. 423 (1 Dec. 

 1906). — Type locality: Tierra Colorada, Sierra Madre del Sur, Guerrero,. 

 Mexico. 



Diagnosis. — Similar to A. turpis, but in every respect smaller. 

 Maxillary tooth-row 5'8-6'l mm. ; forearm 36"5-38 mm. 



A. nanus and turpis. — The chief peculiarities of A. turjns 

 reoccur in A. namis, if anything in a still more pronounced 

 degree : — the depression and slightly ascending trend of the 

 rostrum, the shortening of the bony palate, the high brain-case-. 



