12. SCELOPORUS 265 



g. — Labial region, chin and throat crossed by ir- 

 regular diagonal dark lines radiating from 

 the gular region; frontoparietal plate often 

 in contact with enlarged supraoculars. In- 

 sular. 



S. becki.— p. 3 1 8. 



g'. — Labial region, chin and throat not crossed by 

 radiating dark and light lines or bands; 

 frontoparietal plate very rarely in contact 

 with enlarged supraoculars. Not insular. 



h. — Blue belly patches not confluent with throat 

 patches, and separated from each other by 

 a lighter or darker midventral band. 



i. — Usually smaller, adults 62 to 80 mm. to 

 anus; blue of throat in males often in two 

 lateral patches* which may merge cen- 

 trally; chest, midventral band and lower 

 surface of thigh very light in color or 

 speckled with darker scales. 



S. o. occidentalis. — p. 298. 



1. — Usually larger, adults 75 to 90 mm. to 

 anus; blue of throat in males in a cen- 

 tral patch, never divided; chest, midven- 

 tral band and lower surface of thigh gray 

 or black. 



S. o. biseriatus. — p. 304. 



• I have examined many hundreds of specimens of 5. o. occidentalis and S, o, bistrialus 

 and have not found a male of the latter with two blue throat-patches. Highly colored 

 males of S. o. occidentalis are found in which the two blue patches have extended to. and 

 even merged on. the median line, but by securing very young, or less brilliantly colored, 

 males there should be no difficulty in determining which species occurs in a given locality, 

 for such males never have a single median blue patch if they belong with .?. o. occidentalis, 

 and never have two lateral patches if referable to .S*. o. biseriatus. Females of the latter 

 species have either one or two blue patches, while those of the more northern form usually 

 have two or none. 



