5 32 8. TEIIDM 



"In the largest specimens from Tucson the four dorsal 

 stripes are faint, and the lower one on either side is occasion- 

 ally very obscure except for rounded spots of lighter at inter- 

 vals. In none of the specimens are they entirely wanting, 

 however." 



Distribution. — This black-throated lizard has been found 

 in many parts of eastern and central Arizona, and probably 

 ranges east into New Mexico and south into Sonora. Defi- 

 nite localities in Arizona are in Pima (Fort Lowell, Tucson, 

 Catalina Mountains, Gunsight, Coyote Springs), Cochise 

 (Fairbank, Huachucha Mountains, Rucker Canyon, Chiri- 

 cahua Mountains), Gila (Roosevelt), and Maricopa (Cave 

 Creek, Tempe) counties. 



From Sonora, Cope has recorded it from Hermosillo, 

 under the name C. t. aethiofs. It occurs also at Tepoca 

 Bay, San Pedro Bay, Guaymas, and on Tiburon Island. 



Remarks. — The types of C. melanostethus were said to 

 have been collected near the Colorado River. They have 

 not the intense black throats of many Arizonan specimens 

 and it may be that they do not belong to the form described 

 above, but rather to C. /. tessellatus. Cope's C. t. isthio-ps 

 from Hermosillo, Sonora, is based upon specimens not dis- 

 tinguishable from those described above. If further study 



