Article IV.— THE HYRAXES COLLECTED BY THE AMERICAN 

 MUSEUM CONGO EXPEDITION 1 



By Robert T. Hatt 



Plates XVIII to XXII; Text Figures 1 to 3 



Page 



Introduction 117 



Species with Their Localities and Number of Specimens from Each 



Locality 119 



List of Localities, with Names of the Species and Subspecies and Num- 

 ber of Specimens Taken at Each Locality 119 



Variation not Indicative of Relationship 119 



Some Characters L t tilized for Classification of Hyracoidea and Their 



Variation in the Congo Species 124 



Dendrohyrax dorsalis latrator 126 



Dendrohyrax dorsalis emini 127 



Heterohyrax chapini 132 



Procavia johnstoni lopesi 135 



INTRODUCTION 



The American Museum Congo Expedition, of which Mr. Herbert 

 Lang was leader and Mr. James P. Chapin assistant, operated in the 

 Belgian Congo from 1909-1915. 2 Among the excellent series of mam- 

 mals obtained were ninety-eight hyraxes. Particularly well repre- 

 sented was the then little-known Emin's tree hyrax. A novelty was a 

 new species, Heterohyrax chapini, described in a preliminary report. 3 



Study of the Hyracoidea of the collection was initiated in 1932, 

 but the manuscript left uncompleted pending the appearance of Hahn's 

 monograph 4 of this group. The collection on which the present report 

 is based represents rather fully the hyrax fauna of the northeastern 

 Congo, and thus furnishes a good basis for the appraisal of Hahn's 

 conclusions concerning the taxonomy of the species present in this 

 same area. 



1 Scientific results of the Congo Expedition, Mammalogy, No. 17. 



2 A general account of the expedition with a map of its collecting grounds may be found 

 under the following reference: 



Osborn, Henry Fairfield, 1919, 'The Congo Expedition of The American Museum of Natural 

 History,' Bull. Amer. Museum of Natural History, XXXIX, pp. xv-xvii. 



3 Hatt, Robert T., 1933, 'An Annotated Catalogue of the Hyracoidea in the American Museum 

 etc.,' American Museum Novitates, No. 594, 13 pages. 



4 Hahn, Herbert, 1935, 'Die Familie der Procaviidae,' Zeitschrift fur Saugetierkunde, Bd. IX. 

 pp. 207-358. 



117 



