126 Bulletin American Museum of Natural History [Vol. LXXII 



purposes. The position of the lacrymal foramen (on one side, there 

 being little bilateral asymmetry) as found for these two species is as 

 follows : 







Complete 



Complete 







BELOW 



BEHIND 





Peripheral 



Process 



Process 



Dendrohyrax d. emini 



9 



16 



11 



Procavia j. lopesi 



20 



1 







A survey of all the hyrax skulls in the American Museum indicates 

 that all types of lacrymal foramina occur in all of the genera, but that 

 central foramina are more common in the tree hyraxes and marginal 

 foramina more frequent in Heterohyrax and Procavia. 



The Ventral Surface of the Auditory Bullae 



The ventral surface of the auditory bullae of hyraxes is fairly con- 

 stant in shape within any age group of a species of hyraxes, and as 

 different species show different forms of bullae the character has been 

 used (by Brauer et al.) to distinguish the species. The character, how- 

 ever, is limited in its usefulness for the best descriptive terms are am- 

 biguous and these bullae can at best be described as more or less inflated 

 than those of another species to which they are compared. 



Dendrohyrax dorsalis latrator (Thomas) 

 Procavia emini latrator Thomas, 1910, Ann. Mag. Nat. Hist., (8) V, p. 285. 



Type locality: Batempa, Upper Sankuru River, southern central Congo. 



Dendrohyrax dorsalis emini Hahn, 1934 (part), Zeitschr. fur Saugetierkunde, 



Bd. IX, p. 259. 



A race distinguished from D. d. emini by the white or whitish coloration of the 



basal half of the body hairs. 



Represented by a single, incomplete native skin, unsexed and 

 juvenile, obtained at Bolobo in December, 1914. The American 

 Museum has one other native skin of an adult, collected at Lukolela by a 

 more recent expedition. 



These two incomplete specimens, one probably of a Stage I indivi- 

 dual, the other possibly of one in Stage VIII, bear out Thomas's original 

 description of the race, as far as the skin areas are represented. 



It would seem from the localities represented by the type and these 

 two specimens that the range of Dendrohyrax dorsalis latrator extends 

 along the southwestern border of the Congo Forest. 



Dr. James P. Chapin informs me that the voice of D. d. latrator, as he 



