THE GElSrUS CNEMIDOPHORUS. 45 



CnemidopTiorus gularis gularis B. & G. 



CnemidopTiorus gularis Bd. Gird., Proceeds. Acad. Phila., 1852, p. 138. 

 Baird, U. S. Max. Bound. Surv. Rept., PI. XXXIV, Figs. 1-6. 

 Gnemidophorus guttatus Hallowell, Proceeds. Acad. Phila., 1854, p. 193. 



This form resembles the Sexlineatiis more than any other, but always possesses 

 the postantebrachial plates, and more numerous femoral pores, which range from 

 eighteen to twenty-two. Occasional specimens are, however, intermediate between 

 the two. Its range is the Sonoran region. 



Under this subspecies must be placed four of the series of forms which I de- 

 scribed in my paper on the Reptilia of Chihuahua as subspecies of the C. sexlineatus,* 

 in the following language ; two of the forms (^os. 5, 6) being the C. g. scalaris M. : 



"1. Six longitudinal narrow stripes with unspotted interspaces G. g. gularis (young). 



3. Six stripes as above, the dark interspaces with small white spots C. g. gularis verus. 



3. Six stripes as above, wider and very obscure ; small obscure spots G. g. gularis obsoletus. 



4. Six stripes as above, but wider, and the spots enlarged so as to be confluent occasionally with 



the light stripes... 



" Of the above forms all are numerously represented in the collection. The modi- 

 fication of the color pattern described, is not entirely due to age, as some of the 

 largest specimens belong to ]N^os. 2 and 3. ISTevertheless small specimens predomi- 

 nate in the l^o. 1, and No. 4 presents a good many small specimens." The speci- 

 mens enumerated are as follows : f 



Subspecies No. 1 ; N"os. 14,336-41-49-69 ; 14, 305. 

 Subspecies No. 2; 14,231-41,305-308. 

 Subspecies No. 3 ; 14,231-50-308. 

 Subspecies No. 4 ; 14,341-50-302-5. 



These forms are not sexual, as several of them include both sexes. 



Not having been fully persuaded of the distinction between the C. tessellatus and 

 C. sexlmeatus series, I used the name C s. tigris for a " sixth subspecies " of the above 

 table. The name was however misapplied, although the color pattern is identical 

 with that of the C. tessellatus tigris B. & G., with the exception that there are traces 

 of six stripes instead of only four. The smaller specimens referred to the C. s. sex- 

 lineatus differ from that subspecies in having well-developed postantebrachial scales. 



The gradation in the color characters given is complete, so that no subdivision 

 into subspecies can be made. The case is exactly parallel with that of C. tessellatus 



* Proceeds. Amer. Philos. Soc, (1885) 1886, p. 283. 



t The numbers are attached to lots, by the recorder, and not to individuals, and are hence sometimes duplicated. 



