478 



ME. Gf. A. BOULENGBR OK THE 



[May 18, 



SceJoporus forquahts poinsettii. Cope, 1. c. p. 402. 

 Sceloporus torquatus ajanogenys, Cope, 1. c. 

 Sceloporus torquatus mucronatus, Cope, 1. c. 

 Sceloporus f err ari per ezii. Cope, I.e. p. 400. 



Sceloporus melanogaster, Cope, 1. c. ; Duges, 1. c. p. 114, pi. xii. 

 fig. 7. 



Sceloporus omiltemanus, G-iinth. 1. c. p. 66, pi. xxxii. fig. A. 



Head-shields smooth or nearly so ' ; frontal transversely divided 

 and Jn contact with the interparietal or separated from it by a 

 small azygous shield or by the frontopai'ietals, sometimes broken up 

 into several small shields ; interparietal as long as broad or slightly 

 longer than broad, much larger than the parietals, which are 

 sometimes divided into two pairs ; supraoculars variable, forming a 

 series of four or five trauversely enlarged shields bordered inter- 

 nally by a series of moderate-sized scales (fig. 1, a), or broken up 

 and forming two or three longitudinal series (fig. 1, d) ; one or two 



Kg. 1. 



c- ' d 



Head-shields of Sceloporus torquatus. 



series of small scales separating the enlarged supraoculars from the 

 supraciliaries ; two canthal scales, both often in contact with the 

 subnarial " ; anterior border of ear with a strong denticulatiou 

 formed by three or four pointed scales, which are as large as or a 

 little larger than those preceding. 



^ Duges observes " Ea alguuos individuos las he visto come puntuadas y casi 

 rugosas." 



^ Such specimens appear to have been described by Oope as with a single 

 canthal. A specimen from Hac. del Bobo has one canthal on one side and two 

 on the other. 



