1904.] Allen, M annuals from Tropical America. 79 



47. Artibeus intermedius J. A. Allen. One specimen, Ro- 

 quet-on, Dec. 19. 



48. Artibeus watsoni Thomas. Six specimens, Boqueron, 

 Oct. 4, Nov. i, 13, and 18. 



49. Vampyrops helleri Peters. Six specimens, Boqueron, 

 Oct. 2, 3, 26, and 28. 



50. Desmodus rotundus (E. Geofjr.). One specimen, Bo- 

 queron, Dec. 5. 



51. Alouatta palliata (Gray). Seven specimens, all adult: 

 Boqueron, i, adult male, Dec, 2; Boquete, 6 (3 males, 3 

 females), Aug. 2023. Selected from a large series. 



The collector's external measurements are as follows: 



Total length. Head and body. Tail vertebrae. Hind foot. Ear. 



$ , 1180 550 630 150 30 



$ , IO2O 52O 500 140 25 



^ . I0 95 5 2 5 570 i35 3 

 $ , 1160 570 590 140 35 

 $ > "95 5 6 5 630 155 35 



? ; 1090 530 560 135 25 



? . I0 75 5*5 S 6 o 140 35 



The skull varies greatly in size with age. The oldest male, 

 with the teeth greatly worn and the temporal ridges united to 

 form a low sagittal crest, has a basal length (inner base of 

 incisors to posterior border of occipital condyles) of 103 mm. 

 and a zygomatic breadth of 91, the same measurements in a 

 young adult being 84 and 72. The 7 skulls measure as follows: 



$ , Basal length, 103; zygomatic breadth, 91. 



$, " " 101; " " 88 



$, " 100; 86.5 



$ , " 99; 86 



$, " " 84; " " 72 



9, " 85; 74 



9., " 85; 73 



The range of individual color variation is strikingly great. 

 Two males, strictly comparable as to age (as shown by the 

 skulls), and representing the extremes of a large series, differ 

 as follows: One has the whole head, shoulders, lower back, 



