1906.] IN MEXICAN LIZARDS. 351 



original mid-field is pale greenish, without any spots. This speci- 

 men has obviously entered the monochron^e stage on the antei'ior 

 half of the body ; a feature not uncommon in exceptionally laroe 

 specimens of various kinds of Gnemidopliorus. 



Tivo specimens from Manzanillo, the harbour of Oolima. Both 



are remarkable for the smaller scales which compose the principal 

 row of the collar, the edge of which is formed by several complete 

 rows of small granules. One specimen has 4/4 supraoculars, 

 followed by several rows of small granules behind ; in the other 

 the 4th left supraocular is tiny, whilst on the right side the 4th 

 or posterior is split into two. This is interesting because it 

 represents a condition leading to the 3/3 supraoculars which are 

 normal in C. immaitahilis and depjiei, in either of which, however 

 about 10 per cent, show a fourth supraocular as abnormal. 



In the larger Manzanillo specimen (text fig. 78 0) the sides of 

 the whitish collar are lead-coloured ; on the back a,re 7 bluish- 

 white stripes, each broken up into a row of paler spobs connected 

 by duller portions. Besides a series of larger irregular spots 

 below stripe 1, there are no whitish spots in any of the fields 

 except a few spots in field I. The ground-colour of the back and 

 of the thighs and upper sui'face is uniform dark blue-grey. 



The smaller specimen (text-fig. 78 A) has 6 clear bluish- white 

 stripes running from head to rump, and a short central .stripe 

 from head to mid-back partly dissolved into whitish mottlings. 

 The fields are all uniform blackish without any trace of spots. 



These two Manzanillo specimens are consequently veiy much 

 like C. immHtahilis, fiom which they differ onlj^ b}^ the possession 

 of polygones or scutes on the posterior side of the forearm. 



One might be inclined to assume that in this coastal district 

 of Colima the transition from O. immutabilis into G. communis 

 copei takes place ; just as much as in certain parts of Oaxaca 

 there are large Cnemidophori which might be interpreted either 

 as the most aberrant clans of C. commnnis trending towards 

 C. bocourti and 0. mexicanus, or as aberrant C. immutabilis and 

 gittiahis, which assume characters typical of C. communis. Such 

 are the G. commtonis vai-. austrcdis. 



But to return to these Manzanillo specimens. Although the 

 whole stretch of lowland from Manzanillo to Acapulco, a distance 

 of 350 miles, is zoologically unknown, the fact remains for the 

 present that the nearest bona fide specimens of G. immutabilis 

 were found more than that distance away from Manzanillo, 

 namely by myself still further east of Aca,pulco. I do not doubt 

 that they extend much further west along the coast, but I also 

 know that the lower Balsas flows through a broad belt of dense 

 forest of a size and type sufficient to exclude these lizards. 



Cope's statement that his G. communis occurs also at Coban in 

 Guatemala is as worthless as that of Bocourt that he had 

 G. mexicanus from Salama in Guatemala. It is quite possible, 

 but until these specimens are critically examiiaed comment is use- 

 less. We know that quite a number of Reptiles and Amphibians 



