278 BULLETIN 17 7, UNITED STATES NATIONAL MUSEUM 



The black throat supposed to be constantly present in chrysolaema 

 is belied by the actual white or pale blue-gray color found there 

 occasionally; in affinis, so far as I have observed, the throat is light 

 in color. The presence of enlarged postbrachials is a varying condi- 

 tion in both species; chrysolaema has rather large postbrachials as a 



Figure 77. — Ameiva chrysolaema chrysolaema: a. Top of head; b, side of head; c, forearm 

 showing antebrachials; d, chin and throat; e, hindleg and anal region. U.S.N. M. No. 66730, 

 from Tubano, Azua Province, Dominican Republic. One and one-half times natural size. 



rule, but some examples were found that had the postbrachials scarcely 

 enlarged beyond the size of the surrounding granules; in affinis most 

 specimens do not have enlarged postbrachials, but several examples 

 were found that had postbrachials larger than those of the exceptional 

 chrysolaema having very small postbrachials. Essentially the same 

 thing is true in regard to the enlarged brachials also. 



As to the scales of the median gular region, they are of absolutely 

 no value diagnostically, as a series of specimens from either species 



