462 PROCEEDINGS OF THE ACADEMY OF [1897. 



12. Sceloporus pyrrhocephalus Cope. 



A single young male (C. A. S., No. 3,329) agrees closely with 

 Cope's original description of this species. It was found at Tepic, 

 Jalisco, in October. 



13. Sceloporus obscurus new species. 



Two male specimens, one young and one adult, obtained at Tepic 

 appear to differ in important characters from all known species. 



Type. — Cal. Acad. Sci., No. 3,213, Tepic, Jalisco, Mexico, Gustav 

 Eisen and Frank H. Vaslit, November, 1894. 



Description. — Upper head-shields nearly smooth ; enlarged supra- 

 oculars in one row, separated from mesial head-shields by a com- 

 plete series of small scales; two scales on canthus rostralis; frontal 

 divided transversely but not longitudinally ; interparietal wider 

 than long ; parietals small ; ear-opening with very slight denticula- 

 tion of scales much smaller than those immediately preceding. 

 Dorsal scales strongly keeled, sharply pointed, without marginal 

 serrations, in nearly parallel longitudinal rows. Laterals keeled 

 and pointed, in oblique rows, changing gradually to the larger dor- 

 sals and smaller ventrals. Twenty-eight to thirty dorsals on a line 

 between interparietal plate and base of tail ; about seven equaling 

 length of shielded part of head. Ventrals smooth, emarginate ; 

 gulars weakly keeled, emarginate. Upper caudals considerably 

 larger than dorsals. Distance between base of fifth and end of 

 fourth toe equals distance between end of snout and posterior bor- 

 der of ear-opening. Tibia equals length of shielded part of head. 

 Sixteen to eighteen femoral pores on each side, the series not meet- 

 ing mesially. Males with enlarged postanal plates. 



All the upper surfaces are bluish steel-color, lighter and more 

 bluish about the centres of many scales, sometimes with bronze re- 

 flections, without collar or other markings of any kind except indis- 

 tinct cross-bars on the toes. The lower surfaces are similarly 

 colored, but are paler, with a greenish or bronze cast on the throat 

 and chest and a large area of campanula blue on each side of the 

 belly. There is a light streak along the middle of the throat. 



mm. mm. 



Snout to anus 70 77 



Length of tail — 106 



Snout to ear 17 18 



Shielded part of head 15 16 



Fore limb 35 36 



Hind limb 45 59 



Base of fifth to end of fourth toe . .18 21 



