1908.] DR. KNUD ANDERSEN ON BATS. 285 



islands between Guadeloupe and St. Kitts no specimens have 

 been available. St. Kitts is inhabited by A. j. jamaicens is, the 

 range of which, so far as the West Indies are concerned, ex- 

 tends from here westwards over Porto Rico and San Domingo to 

 Jamaica. 



A. j. prcpceps comes in every respect considerably nearer to its 

 southern neighbour, A. j. jxdmarum, than to its western neighbour, 

 A. j. jamaicensis. From this it seems reasonable to conclude that 

 it is a northern offshoot of A. j. pcdmariom, not an eastern offshoot 

 of A. j. jamaicensis. 



It would be practically impossible to discriminate A. j. prceceps 

 from A . j. cequatorialis ; but the latter is a large southern 

 representative of A. j. jamaicensis inhabiting Ecuador and S. 

 Colombia, the former a slightly diminished insular representative 

 of A.j. palmanmi, inhabiting, as just pointed out, certain islands 

 between St. Vincent and St. Kitts. Their extremely close re- 

 semblance is a coincidence ; the descent of the two races is 

 different, and they occupy widely separated areas ; they have 

 acquired similar features, but by different lines of development. 



Specimens examined. — Dominica (1), Guadeloupe (2). With 

 skulls. From the collection of the U.S. National Museum *. 



Range. — As yet known only from Dominica and Guadeloupe, 

 W. I. 



Artibeus glaucus Thos. 



1844. ? Phyllostoma pusillum (not Natterer) Tsclmdi, Fauna Peruana, pp. 63-64. 

 1893. Artibeus glauciis Thomas, P. Z. S. 1893 (18 April) pp. 336-37, pi. xxix. 

 figs. 7-9. — Type locality : Chauchamayo, Peru. 



Diagnosis. — Molars f . Cusp 7 of m^ small. Forearm 43-8 mm. 



Skull. — In shape the skull is almost precisely similar to that 

 of A. hirsidus, planirostris, or jamaicensis, the only appreciable 

 difference being the slightly lower brain-case ; but it is much 

 smaller : in linear dimensions |, in bulk less than i, the size of 

 an A. hirsuttis skull. 



Teeth. — Differ from those of ^4. concolor, planirostris, and 

 hirstitus, a.nd accord with those of A . jamaicensis, in the complete 

 disappearance of m^ ; differ from those of all the species mentioned 

 chiefly in the less developed lingual parts of the premolars and 

 molars (particularly of m^), and in the much smaller size of all 

 the teeth. 



The inner heels of p^ and p^ are proportionately slightly smaller 

 than in the foregoing species. In all of these latter there is a 

 small, but perfectly distinct, cusp rising from the antero-internal 

 margin of the heel of p^ ; in glaucus this cusp is practically 

 wanting (an exceedingly faint indication of the cusp is detect- 

 able by the aid of a strong lens). Citsp) 7 of m^ (the postero- 

 internally projecting portion of the tooth) is considerably less 

 developed than in any of the foi'egoing species ; in the single 

 skull available it is not much more than a distinctly projecting 

 * U.S. N. M. nos, 113503-4, 113628. 



