58 BULLETIN 151, UNITED STATES NATIONAL MUSEUM 



The series consists of three juveniles and two adult males, of which 

 the larger measures 418 mm. from snout to vent; the tail is damaged; 

 these two males have 9 and 10 praeanal pores, respectively. 



I am glad of the opportunity to reexamine these specimens, which I 

 identified in the field in 1916 as J., colonorum ^^ { = A. agama agama). 

 The slight vertebral crest which forms a key character to mossamMca 

 is certainly present in the adults though scarcely distinguishable in 

 young specimens. 



AGAMA ATRICOLLIS Smith 



Agama atricollis Smith, 1849, lUustr. Zool. S. Africa, vol. 3, Appendix, p. 14 

 (Natal, S. Africa). — Boulenger, 1885, Cat. Liz. Brit. Mus., vol. 1, p. 358. — 

 ToRNiER, 1897, Kriechtiere Deutsch-Ost-Afrikas, p. 29. — Schmidt, 1919, 

 Bull. Amer. Mus. Nat. Hist., vol. 39, p. 477, pi. 18, fig. 1 (bibliography and 

 discussion). — Barbour and Loveridge, 1928, Mem. Mus. Comp. Zool., 

 vol. 50, p. 153. 



Agama gregorii Gunther, 1894, Proc. Zool. Soc. London, p. 86. (Mkonumbi, 

 Kenya Colony coast.) 



3 (U.S.N.M. 40713, 40730-1) Guaso Nyiro River, K. C. (Sm. Afr. 



E.xped.) 1909. 

 3 (U.S.N.M. 41515, 41707, 42020) Lake Naivasha, K. C. (Sm. Afr. 



Exped.) 1909. 

 1 (U.S.N.M. 41909) Fort Hall, K. C. (Sm. Afr. Exped.) 1909. 



1 (U.S.N.M. 41360) Thika, K. C. (Sm. Afr. E.xped.) 1909. 



3 (U.S.N.M. 42044, 42065-6) Kenya Colony or Uganda. (Sm. Afr. 



Exped.) 1910. 



2 (U.S.N.M. 42176-7) Kabulamuliro, U. (Sm. Afr. Exped.) 1910. 



2 (U.S.N.M. 42180-1) Kianuna, Entebbe, U. (Sm. Afr. Exped.) 1910. 

 1 (U.S.N.M. 42228) Kikonda, U. (Sm. Afr. Exped.) 1910. 



1 (U.S.N.M. 49086) Kisumu, K. C. (Sm. Afr. Exped.) 1909. 

 42 (U.S.N.M. 42104-45) Mount Sagalla, K. C. (Heller) 1911. 

 5 (U.S.N.M. 49204-6, 49394-5) Kaimosi, K. C. (Heller) 1912. 



4 (U.S.N.M. 63444-6, 63485) Masinde, U. (Raven) 1920. 

 20 (U.S.N.M. 63451-70) Nabea, U. (Raven) 1920. 



2 (U.S.N.M. 63471-2) Budongo Forest, U. (Raven) 1920. 



This series, already referred to by Schmidt in the citation given 

 above, consists of 62 males, ranging from 119 (53 + 66) mm. to 316 

 (134 + 182) mm., and 28 females ranging from 91 (34 + 57) mm. to 

 267 (118 + 149) mm. The disproportion in the sexes is to be accounted 

 for by probable selection of the larger and handsomer males as they 

 rest upon the tree trunks; it may well be that the females are more 

 ready to take refuge when disturbed. The series corroborates 

 Tornier's conclusions as to ^4. gregorii not being distinct; keeled or 

 keelless ventrals occur more or less haphazardlj^ and without any 

 apparent reference to any particular geographical areas. 



Two specimens had female oxyuroid nematode worms,^" protruding 

 from the anus. 



i» Loveridge, 1920, Proc. Zool. Soc. London, p, 140. 

 » Identified by Doctor Sandground. 



