MR. E. I, POCOCK ON HYBRID FOALS. 993 



shoulder-stripe is shorter and simpler ; the spinal strip is black and 

 zig-zag over the saddle, and very faint, short, narrow, close-set. 

 stripes are detectable on each side of it along the back and 

 elsewhere on the body, the hairs of these ' ghost-stripes ' being a 

 shade darker and glossier than the spaces between them. The 

 spinal crest is not so pronounced ; the apical black patch on the 

 ear is smaller, and the basal stripe, although much narrower, 

 is decidedly blacker. Faint narrow stripes are present on the nose 

 as in the first described hybrid ; the lips and area round the 

 nostrils are black, and the two patches above the nostrils which 

 are dark tan in the dam are dark greyish brown in the foal, 

 and somewhat sharply contrasted with the narrow lighter area 

 that intervenes between them and the general sandy grey hufr 

 of the nose. 



The left-hand figure of pi. Iviii. of the ' Knowsley Menagerie' 

 represents a hybrid between a Domestic Ass and a Burchell's 

 Quagga {U. quagga hurchelli). This hybrid appears to differ from 

 the one above described in having a few quite distinct brown 

 stripes on the body and very few stripes on the legs. Th& 

 ground colour of the legs, moreover, is markedl}^ whiter. Since 

 Burchell's Quagga differs from Chapman's in having the legs 

 whiter and almost stripeless, the difference in the coloration of 

 the limbs between the two hybrids is not a matter for surprise. 



In connection with the two hybrids born in the Gardens and 

 those that have been bred elsewhere previously between the same 

 species, namely E. asinus and E. zebra, or U. quagga, irrespective 

 of the exact race or breed of the species, the following points 

 may be noticed. The white muzzle of B. asinus is eliminated. 

 In other respects asinine chai-acters are dominant over zebrine 

 and quaggine characters, as is shown by the absence of stripes 

 on the mane, the disappearance of the white tip to the ear, and the 

 suppression, partial or complete, of the stripes on the neck, head, 

 body, and quarters. Even when stripes are visible on these areas 

 they do not resemble in width and arrangement those of Mountain 

 Zebras and Quaggas, but are more suggestive of the narrower 

 stripes of Grevy's Zebra (E. grevyi), as in the case of some horse- 

 quagga hybrids bred by Prof. Cossar Ewart. Examples of typical 

 E. asinus carry a dark basal patch on the ear, a spinal and 

 a shoulder stripe, and very frequently distinct or indistinct bars 

 on the legs. The spinal stripe is also frequent on all Asiatic asses ; 

 and the Mongolian species {E. hemionus hemionus) sometimes 

 shows traces of a shoulder-stripe and of leg-stripes on the knees 

 and hocks as well. The Tibetan Wild Ass {E. kiang) has a large 

 dark basal patch on the ear, and spinal, shoulder and leg stripes 

 are commonly visible in many horses. Although the basal ear- 

 patch, the shoulder stripe, and spinal stripe are absent in typical 

 examples of E. asinus somaliensis, no one doubts that this race 

 is descended from asses bearing the marks in question. Inter- 

 mediate forms indeed, with very narrow spinal and shoulder stripes 

 and a dusky patch on the ear, connect the Somaliland Ass with 



