288 DR. KKUD ANDERSEN ON BATS. l^pr. 7, 



Measurements. — On p. 289. 



S'pecimens examined. — One, the type, in the collection of the 

 British Museum. 



Range. — Chanchamayo, Junin, Central Peru. 



Tschudi's Phyllostoma jjusiUam, 1844. — Indeterminable from 

 the description ; the author refers only to the colour, the nose- 

 leaves, ears, membranes, and general size ; neither to the skull 

 nor to the teeth. The only measurement of any practical value is 

 that of the forearm, " 1" 5'" " {i. e. 37 mm.) ; if this measurement 

 was taken according to the same method as used in the pre- 

 sent paper, and if the specimen measured was full-grown, then 

 Tschudi's laat was not an A. glaucns ; if an Artibeiis (not a 

 Vampy7-oj)s), it may have h^en A. rosenhergi. — Even if Tschudi's 

 Ph. pihsillwm were proved to be ^. glaucus, the latter name would 

 have to stand, the former being preoccupied by batterer's 

 Ph. jmsiUicm, which is Vampy^^essa pusilla* . 



Artibeus watsoni Thos. 



1901. Artiheus watsoni Tliomas, Ann. & Mag. N. H. (7) vii. pp. 542-43 (1 June, 



1901). — Tvpe locality; Bogava, Chinqui. 

 1804. Artiheus watsoni Thos., J. A. Allen, Bull. Am. Mus. N. H. xx. Art. iv. 



p. 79 (29 Feb. 1904).— Boqueron, Chiriqui. 



Diagnosis. — Similar to A. glaiocas, but smaller. Forearm 

 37-2-40-5. 



A. loatsoni and glaucus. — A. watsoni is a Central American 

 representative of the A . glaucus type, differing from the Peruvian 

 species only in the rather smaller size, proportionately slightly 

 longer ears, and longer intei'femoral. 



The skull is quite of the same shape as in glaticus, but a trifle 

 smaller, especially narrower ; of nine skulls of watsoni none 

 reaches the single skull of glaucus in size. 



The teeth are in every respect (including the size) as in glaucus. 

 There is, as a rule, a faint remnant of the notch in the hinder 

 margin of nr, between its cusps 5 and 7, but in some individuals 

 also this trace has disappeared, the margin being perfectly simple. 



The horseshoe is free all round, the margin sometimes simple, 

 sometimes finely crenulate. 



The ears are, apparently, propoi-tionately a little longer, and 

 rather narrower in their upper half (less broadly rounded ofl') 

 than in glaucus ; but of nine specimens examined of watsoni two 

 only are preserved in alcohol, and only one specimen of glaucus 

 is available for comparison. Three small serrations on the outer 

 margin of the tragus above the median projection. 



Both the alcoholic specimens have the interfemoral markedly 

 longer than in A. glaucus: 11-8 and 13-5 mm., as against 8 mm. 



On the wing-structure, see A. glaitcics (above, p. 287). Hairing 

 on limbs and membranes as in A . glaucus, 



* Thomas, Ann. & Mag. N. H. (6) iv. pp. 169-70 (Aug. 1889) ; and (7) v. p. 270 

 (:\ravch 1900). 



