1936] Hatt, Hyraxes Collected by American Museum Congo Expedition 



119 



SPECIES WITH THEIR LOCALITIES AND NUMBER OF SPECIMENS 

 FROM EACH LOCALITY 



Species Localities Specimens 



1. — Dendrohyrax dorsalis latrator Bolobo, 1. 1 



2. — Dendrohyrax dorsalis emini Akenge, 3; Avakubi, 1; Gaman- 



gui, 4; Medje, 6; Ngayu, 2; 



Niangara, 3; Niapu, 24. 69 



3. — Heterohyrax chapini Matadi, 2. 2 



4. — Procavia johnstoni lopesi Aba, 24; Faradje, 1; Vankerck- 



hovenville, 1. 26 



LIST OF LOCALITIES, WITH NAMES OF THE SPECIES AND SUBSPECIES 

 AND NUMBER OF SPECIMENS TAKEN AT EACH LOCALITY 



Localities 



Species and Subspecies 



Number of £ 



Aba 



Procavia j. lopesi 



24 



Akenge 



Dendrohyrax d. emini 



3 



Avakubi 



Dendrohyrax d. emini 



1 



Bolobo 



Dendrohyrax d. latrator 



1 



Faradje 



Procavia j. lopesi 



1 



Gamangui 



Dendrohyrax d. emini 



4 



Matadi 



Heterohyrax chapini 



2 



Medje 



Dendrohyrax d. emini 



6 



Ngayu 



Dendrohyrax d. emini 



2 



Niangara 



Dendrohyrax d. emini 



3 



Niapu 



Dendrohyrax d. emini 



24 



Vankerckhovenville 



Procavia j. lopesi 



1 



VARIATION NOT INDICATIVE OF RELATIONSHIP 



Individuality in Skulls 



Skulls of the hyraxes show a range in variation in general skull type 

 beyond that encountered in many mammals. Comparing specimens of 

 equal apparent age, 1 as judged by suture closure, development of skull 

 ridges and dental wear, there are found skulls that contrast to the ex- 

 tremes shown by the measurements given below for Dendrohyrax d. 

 emini. Specimens of every intermediate size and shape occur in the 



1 For the convenience of the reader, Thomas's (1892, P. Z. 

 velopmental stages of the hyraxes is repeated. 



S., p. 53) classification of the de- 



Stage I. Before the milk dentition is fully in place. 



Stage II. Milk dentition all up and in use. M 1 not visible. 



Stage III. M 1 up; M 2 below level of bone. 



Stage IV. M 2 just appearing or partly up. 



Stage V. M 2 nearly or quite up, M 3 below level of bone. 



Stage VI. Tip of M 3 appearing. 



Stage VII. M 3 partly or nearly up, but still unworn. 



Stage VIII. M 3 up and in use. 



