86 BULLETIN 99, UNITED STATES NATIONAL MUSEUM. 



larger head and longer, more powerful forearm. Tlie great difference 

 in the size of the head is perhaps the best character to separate 

 specimens in spirits, miless the skull be removed. The length of 

 forearm is not always diagjiostic, but there is never any doubt of 

 the species when the skull is examined. 



In describing Hipx>osideros caffer centralis, Doctor Andersen con- 

 sidered his new form a subspecies of caffer, and believed that only 

 the large form occurred in Uganda. That such is not the case is 

 plainly shown by our excellent series from Gondokoro, where the 

 two species occur together without any indication of intermediate 

 specimens. The type-si-)ecimen of Noack's PlvyllorMna rubra, which 

 Andersen considered one of two known specimens intermediate 

 between caffer and centralis, but nearer to caffer, is, so far as size is 

 concerned, perfectly typical of his centralis. The accompanying 

 table of measm-ements of specimens from which skulls have been 

 removed makes this very plain. Out of the 149 specimens of the 

 two species in our collection there is no trace of intergradation, and 

 the differences between the two species are so great that any blend- 

 ing seems quite improbable. The great difference in bulk between 

 skulls of the two species is poorly indicated by the measurements. 



In addition to the dimensions of specimens with skulls Msted in the 

 accompanying table, the following measurements have been taken of 

 the forearms of alcoholic specimens of the two species, caffer and 

 niher: 



Hi])posideros caffer. 



Gondokoro: 47, 46, 47, 45, 47, 47, 46, 47, 47, 48, 49, 48, 47, 48, 48, 

 47, 48, 47, 48, 48, 46. 



Northern Guaso Nyiro: 47. 



Nairobi River: 48. 



Nairobi: 48, 48. 



Kijabe: 50. 



Juja Farm: 49. 



Southern Guaso Nyiro: 51, 51, 50, 50, 50, 50. 50, 50, 50, 50, 51. 



Zanzibar: 46. 



Hipposideros ruber. 



Bor: 52. 



Gondokoro: 54, 54, 53, 52, 55, 53, 53, 53, 52, 53, 53, 52, 55, 53, 51, 

 52, 52, 54, 52, 51, 53, 54, 54, 51, 53, 54, 54, 53, 52, 52, 51, 53, 51, 51, 

 52, 54, 52, 50, 51, 55, 54, 53, 52, 53, 53, 52, 53, 51, 54, 52, 51, 51, 52, 

 50, 50, 53, 53, 53, 52, 54, 53, 53, 52, 53, 53, 52, 53, 52, 53, 54, 52. 



Nairobi: 51. 



For complete tables of measurements of specimens see pages 87-88. 



