EAST AFRICAN REPTILES AND AMPHIBIANS 87 



Zanzibar, and Mozambique. Those from Mtoto Andei, the Kafue 

 River, and Landau in Angola are of the larger scaled kind, but there 

 are so many intergradations and the distribution is so irregular that 

 I think it is impossible to recognise isahellinus as a race. 



Chamaeleo angusticoronatus was founded on an individual which pos- 

 sessed a combination of characters or variations, all of which may be 

 found in a large series. After comparing the holotype with typical 

 dilepis from Zanzibar and the adjacent mainland, I do not think that 

 it can reasonably be considered specifically distinct, particularly as 

 no other specimens have appeared in the quarter of a century since 

 it was described. 



CHAMAELEON BITAENIATUS BITAENIATUS Fischer 



Chamaeleo bitaeniatus Fischer, 1884, Jahrb. Hamb. Wiss. Anst., vol. 1, p. 23, pi. 



2, fig. 7. (Massai Land, East Africa.) 

 Chamaeleon bitaeniatus Boulenger, 1887, Cat. Lizards Brit. Mus., vol. 3, p. 452. 

 Chamaeleon bitaeniatus var. bitaeniatus Tornier, 1897, Kriechthiere Deutsch- 



Ost-Afrikas, Berlin, p. 50. 



1 (U.S.N.M. 40729) Southern Guaso Nyiro, K. C. (Sm. Afr. Exped.) 



1909. 

 1 (U.S.N.M. 40933) Lukenya Hills, K. C. (Sm. Afr. Exped.) 1909, 

 1 (U.S.N.M. 40951) Sotik, Guaso Nyiro, K. C. (Sm. Afr. Exped.) 1909. 

 3 (U.S.N.M. 41708-10) Lake Naivasha, K. C. (Sm. Afr. Exped.) 1909. 



3 (U.S.N.M. 48567-9) Mtoto Andei, K. C. (Heller) 1911. 

 9 (U.S.N.M. 49170-8) ? Mt. Sagalla, K. C. (Heller) 1911. 

 7 (U.S.N.M. 49378-84) ? Kakumega, K. C. (Heller) 1911. 



4 (U.S.N.M. 49443-6) Kenya Colony. (HeUer) 1911. 



The series is composed of 13 males and 16 females; as a rule the 

 sexes can not be distinguished from external appearance. The largest 

 male measures 149 (84 + 65) mm. and the largest female is 159 (80 

 + 79) mm. Two chameleons, one of either sex, have lost the tips of 

 their tails; after excluding these it was found that the tails of the males 

 range from 0.43 to 0.50 of the total length, with an average of 0.461; 

 in the females the range is from 0.41 to 0.49, with an average of 0.447; 

 the overlapping is so frequent that the length of the tail is no guide to 

 sex; in both sexes it is almost invariably shorter than the length of the 

 head and body; in only one chameleon, a male (40729), does it equal 

 the body length; in no specimen does it exceed it. Eighteen embryos 

 are present in one female and are so well developed that it is evident 

 that this race is ovo-viviparous, 



CHAMAELEON BITAENIATUS HOHNELII (Steindachner) 



Chamaeleon hohnelii Steindachner, 1891, Sitzber. Akad. Wiss. Wien, vol. 100, 



p. 307, pi. 1, fig. 1 (Leikipia, Kenya Colony). 

 Chamaeleon leikipiensis Steindachner, 1891, Sitzber. Akad. Wiss. Wien, vol. 



100, p. 309, pi. 1, fig. 2 (Leikipia, Kenya Colony). 

 Chamaeleon bitaeniatus Boulenger, 1892, Ann. Mag. Nat. Hist., ser. 6, vol. 9, 



p. 72. 



