1885.1 ^83 [Cope- 



6. Uta bicarinata Dumeril. One specimen ; No. 14248. The most 



northern locality for this lizard. 



7. Sceloporus torquatus Green & Peale ; subspecies poinsettii Bd. & 



Gird. Two specimens ; Nos. 14233-43. 



8. Sceloporus undulatus Latr. Abundant ; many of the males are 



without the undulating cross-lines. The most southern locality in 

 Mexico. 



9. Sceloporus grammicus Wiegm. One specimen ; No. 14246. I men- 



tion here that the range of the S. variabilis has been recently extended 

 a considerable distance to the northward of the limit, Monterey, 

 which 1 gave in my synopsis of the species of Sceloporus in the Pro- 

 ceedings of this Society, 1885, p. 397. Mr. Wm. Taylor has found it 

 near San Diego in S. W. Texas, and Mr. Eugene Aaron has procured 

 it from near Corpus Christi. For specimens from the latter place I 

 am indebted to my friend Mr. J. L. Wortman. 



10. Cnemidophorus sexlineatus Linn. Very abundant in three princi- 

 pal subspeciflc forms, which received names from Messrs. Baird and 

 Girard. The characters displayed by these forms are instructive as 

 showing how a longitudinally striped coloration may pass by insensi- 

 ble gradations into a cross-banded one. The subspecies and their 

 forms are distinguished as follows : 



Six longitudinal narrow stripes with unspotted interspaces 



subsp. sexlineatus. 



Six stripes as above, the dark interspaces with small white spots 



subsp. guttatus. 



Six stripes as above,- wider, and very obscure ; small obscure spots 



subsp. No. 3. 

 Six stripes as above, but wider, and the spots enlarged so as to be con- 

 fluent occasionally with the light stripes subsp. No. 4. 



The stripes wider, and the spots confluent with them, so as to reduce the 

 dark ground color to a series of rows of short transverse cross-lines. . 



subsp. No. 5. 



The short black cross-bars more or less confluent across the positions of 



the light stripes, forming transverse cross-bands, which are generally 



best developed on the sides subsp. tigris. 



Of the above forms all are numerously represented in the collection. 

 The modification of the color pattern described, is not entirely due to age, 

 as some of the largest specimens belong to subspecies guttatus, and No. 

 3. Nevertheless small specimens predominate in the subspecies sexlineatus, 

 and large ones in the subspecies tigris. Subspecies No. 4 presents a good 

 many small specimens. The form I described as G communis (Proceed- 

 ings Am. Phil. Soc, 1877, p. 95), from Southern Mexico, has the colora- 

 tion of the subspecies guttatus and No. 4, but differs from them in possess- 

 ing a frenoocular plate. In a few cases, however, this plate is wanting in 



