520 PROCEEDINGS OF THE ACADEMY OF [1896. 



*18. Strepsiceros imberbis BIyth. Lesser Kudu. 



A head of this animal was taken by Dr. Smith. It is now beauti- 

 fully mounted. 



19. Equus grevyi M. Edw. Grevy's Zebra. 



A remarkably large skull was added to the already fine collection 

 of zebra crania in the collection of the Academy of Natural Sciences 

 of Philadelphia. Its greatest length, from the anterior edge of the 

 premaxillary to the superior rim of the occiput, measured in a straight 

 line, is 633 mm. Its greatest zygomatic width is 220 mm. The 

 alveolar length of the upper molar series is 170 mm., and the great- 

 est length of mandible is 507 mm. The specimen is of an old male 

 and, compared with a skull of E. hurchelli of same age, is 100 mm. 

 longer, and is nearly 50 mm. longer than the largest skull of E. 

 caballus in the collection of the Academy of Natural Sciences of 

 Philadelphia. Compared with that of hurchelli the skull of grevyi is 

 remarkably long for its width, due to the great relative proh)ngation 

 of the rostral and occipital regions. In hurchelli the length of 

 skull is 2.63 times the width, in grevyi it is nearly three (2.88) times 

 the width. The lower molar series differ markedly from hurchelli 

 in their uniformly massive size and great width, the same series in 

 btirchelli becoming much narrowed posteriorly. In the last named, 

 the postpalatal fossa reaches opposite middle of m. 2, in grevyi it 

 barely reaches opposite the anterior alveolus of m. 3. 



*20. Rhinoceros bicornis L. Round-eared Rhinoceros. 



Of the smaller two-horned species there is a mounted head and 

 six pairs of horns in the University of Pennsylvania collection. 

 With the exception of one pair, the horns more closely resemble 

 those figured by Smith** in his plate of Rhinoceros simus than those of 

 bicornis figured by the same author on plate 2. 



Dr. Smith informs me that while he encountered B. siinus, no 

 specimens were brought by him to this country. 



21. Procavia brucei somalica Thomas. Somali Tree Hyrax. 



An adult female (No. 3,818) taken at "Shebeli" September 4, 

 1894, and another female, two-thirds grown, taken March 3, 1894, 

 fully confirm Dr. Thomas' diagnosis'" of this subspecies of brucei. 

 Compared with an adult female specimen of brucei from the Kyahn 

 Mountains, near Mount Kilima-Njaro, kindly loaned 'me by the 



9 111 list. Zool. S. Afr. 

 "> P. Z. S., 1892, p. 71. 



