316 DR. H. GADOW OX EVOLUTIOI^ [Mar. 20, 



specimens with only 8 white stripes and with a narrow uuiformly 

 darker centre are very rare. 



(2) The scarcity of black on the collar and thi-oat of the males ; 

 only in 6 males was the collar black or inclining to black, although 

 in one adult male from Tequesixtlan the whole throat was blue 

 and partly suffused with black from the collar upwards. 



(3) Tendency of stripe 1 and even of stripe 2 to break up into 

 beads, and the appearance, advancing with age, of white spots in 

 field I. and in the lateral field, so that one or two additional lines 

 of beads may be developed in this lateral field. 



This breaking up of the first stripe into beads occurs also in 

 some few specimens of Tierra Oolorada, and in one of the 7-striped 

 specimens from San Luis. 



Fer« Gruz-inear the seashore : 7 specimens collected by Dr. Meek. 

 1 with 8 stripes, 5 with 9 stripes ; and in a young specimen the 

 central, 5th strijDe, is restricted to the nape and neck. Throat 

 and collar not black. 



Las Peiias, Jalisco, near the seashore : 4 specimens collected by 

 Dr. Buller, Brit. Mus. 



1 very young specimen of 33 mm. ; with 10 stripes, and Avith 

 an additional faint line on the flanks. 



1 5 of 45 mm. ; with 10 stripes, and with an additional weak 

 line. 



1 $ of 54 mm. ; with 9 stripes, and with a stronger line. 



1 cj" of 65 mm. ; with 9 stripes ; with two additional long lines 

 of white beads ; moreover stripes 3 and 4 are dissolved into beady 

 lines. Throat and collar black, abdomen blue. 



Colhna. — Cope's descinption of Cnemidophorus lineatissimus, 

 Proc. Amer. Phil. Soc. 1877, p. 94. Black, with 10 or 11 pale 

 bands, sides and femora j)ale-spotted ; throat black. This and the 

 rest of his description refer obviously to 10- or 11-sti'iped male 

 specimens of C. deppei, resembling some of those of Oaxaca and 

 Las Pehas in Jalisco. Cope gives "Guadalajara" as another 

 locality, a very doubtful statement. The plain of Guadalajara, 

 with its elevation of more than 5000 feet, is absolutely above the 

 I'ange of C. deppei and C. immutahilis, which are essentially hot- 

 country species ; but it is possible that Cope's specimens came 

 fr-om the barranca, through which flows the Rio Santiago, a few 

 hours' ride from the town, and 2000 feet lower than the surround- 

 ing plateau. — Bocourt, Miss. Scient. Mex., described two specimens 

 from " Colima," with 9 stripes. 



Cnemidophorus deppei, var. cozumela. 



4 specimens from the island of Cozumel, East Coast of Yucatan. 

 British Museum. 



Length 64-71 mm. ; the largest specimen is gravid. 



Collar like that of C. deppei. 



Supraoculars : one with 3/3 ; two with 3 left, right posterior 

 very small ; one with 4/4, the posterior very small. In this respect 

 resembling some of the C. deppei of South Guerrero. 



