KO. 5 MAMMALS OF PANAMA — GOLDMAN 205 



tinct whitish facial stripes of which a supraorbital pair usually 

 extend from the nose pad to near the inner sides of the ears, and a 

 pair, faintly indicated (or absent), reach from near the angle of the 

 mouth toward the ears. The forearm measures about 62 milHmetcrs. 

 Examination of the skull is necessary in order to distinguish this 

 bat with certainty from Artibeus planirostris planirostris. It lacks 

 the tiny third upper molar present at the posterior end of the series 

 in the latter form. 



Fig. 16. — Artibeus jamaicensis jamaicensis. 

 No. 203082, U. S. Nat. Mus. .•\bout nat. size. 



Dr. Knud Andersen (1908) in a revision of the genus states 

 (p. 266) that " to prevent wrong identification it is important to 

 emphasize that Central America is inJiabitcd by tivo races, which 

 ought not to be (but hitherto have always been) confused, viz., the 

 smaller (truly indigenous) A. ;'. jamaicensis and the larger A. j. 

 palniarum (an immigrant from south)." In similar language he 

 reiterates (p. 278) that " in Central America and S. Mexico A. j. 

 palmarum meets the considerably smaller A. j. jamaicensis. There 

 is no doubt whatever that the latter race is the truly indigenous form 

 in the region north of Panama, and that A. j. palmarum is a late 

 intruder from the south into the same region." Dr. Andersen's 

 positive assertions, made after a careful study of the group, should 

 be given considerable weight ; but since the forms as recognized by 

 him appear to be characterized by average dififerences only, his 

 interesting conclusions in regard to their geographic ranges seem 

 open to serious question. The Middle American material recorded 

 by him includes four specimens from Bugaba, Chiriqui, referred to 

 A. p. palmarum, and a single example from Colon referred to A. j. 

 jamaicoisis. 



Most of the specimens from Panama examined by me are indis- 

 tinguishable from typical A. j. jamaicensis, having about the same 

 general dimensions (forearm rarely reaching 65 millimeters) and 

 degree of posterointernal emargination of the second upper molar, 

 and the same dark color, including indistinct facial stripes. Although 

 Bugaba examples are somewhat larger, I assign them, along with the 

 others, to the typical form. 



