34 A SYNOrSIS OF THE SPECIES OF 



range of variations of color seen in the C tessellatus is about the same as that seen 

 in the G. gularis, although, with a few exceptions, the subspecies of the two may be 

 distinguished from each other by color characteristics, without examining the scale 

 characters. The parallelism is, however, very close, and shows the same line of modi- 

 fications. I refer more especially to these under the head of C. gularis. 

 The subspecies of the C. tessellatus are five, as follows : 



I. Brachial scales 4-5 rows ; femorals 6-7 rows. 



Blackish olive above with a median dorsal paler stripe, and three similar stripes on each side ; 

 belly and throat unspotted C. t. perplexus. 



Two pale stripes on each side only, the interspaces pale spotted, and frequently broken up into 

 black or olive spots so as to destroy their integrity ; generally sparsely black spotted below, 



C. t. tessellatus. 



No stripes, but 12-14 longitudinal series of pale spots on an olivaceous ground, more or less con- 

 fluent ; hind legs with numerous pale spots ; thorax, collar, and more or less of throat, 

 black C. t. melanostethus. 



II. Brachial scales in 5-6 rows ; femorals 8-9 rows. 



No stripes ; ground color dove brown, with 3 rows of more or less obsolete black spots on the 

 back, and vertical black bars on the sides ; abdominal plates pale, black edged ; hands and 

 inferior faces of hind legs and tail red ; larger C. t. rubidus. 



III. Brachial scales 7-8 rows ; femorals in 8-9 rows. 



Four light stripes &bove, interrupted and connected with light spots and lines in the black inter- 

 spaces, sides, throat and inferior surfaces variegated black and white ; medium, 



C. t. mulliscutalus. 



CnemidopTiorus tessellatus yerplexus Bd. Gird. 



Cnemidophorus perplexus Bd. Gird., Proceeds. Acad. Phila , 1852, p. 128. 

 Cope, Check List Batr. Rept. N. Amer., 1875, p. 46. 



The type specimen is the largest obtained, and is probably adult. Its colors are 

 rather obsolete, while those of three younger specimens are as strongly contrasted as 

 in the young of any other form. Among all the striped forms of the C. tessellatus, 

 this one is distinguished by the presence of seven stripes and no spots. It is, so fir 

 as yet known, confined to the valley of the Rio Grande river. 



Cnemidophorus tessellatus tessellatus Say. 



Gnemidophorus tessellatus Baird, I. sup. cit. ; Cope, I. sup. cit. ; Amiva tessellata Say, I. sup. cit. 



Gnemidophorus gracilis Bd. Gird., Proceeds. Acad. Phila., 1852, 128 ; Baird, U. S. Mex. Bound. Surv., Report II, Pt. 



II, Rept., p. 10, PI. XXXIV, Figs. 7-14. 

 Gnemidophorus marmoratus B. & G., Proceeds. Acad. Phila., 1852, p. 128. 

 Gnemidophorus tigris Bd. Gird., Proceeds. Acad. Phila., VI, 1852 (April), 69 ; Baird, U. S. Mex. Bound. Surv. Rept., 



1859, II, Pt. II, Reptiles, p. 10, PI. XXXIII. 

 Gnemidophorus iissellatus tigris Cope, Check List Batr. Rept. N. Amer., 1875, p. 46. 

 Gnemidophorus undulalvs'S.sMoyf., Proc. Acad. Phila., VII, 1854, June, p. 94 



