2 University of Michigan 



zona, northern Sonora, and prol^ably southern Utah. That the 

 case is not wholly clear is readily admitted for there is some 

 evidence that ringed specimens may occur in the eastern range, 

 but the geographical distribution of the ringed and ringless 

 specimens is so suggestive of two races that it is deemed ad- 

 visable to open the question by the proposal of a name to rep- 

 resent a western form of D. regalis distinguishable from an 

 eastern form by the presence of a neck ring. This western 

 race may be known as 



Diadophis regalis arizonae, new subspecies 



Diagnosis : Like Diadophis regalis regalis Baird and ( lirard 

 except for the possession of a l)road ring of lighter color be- 

 hind the head. 



Type Specimen : United States National Mu?eum. number 

 62568. collected by G. Hofer. 



Type Locality ■ Sabino Canon. Arizona. 



Range: Central Arizona to northern Sonora. 



Description of Type Specimen: ventral plates, 219; anal 

 plate divided; caudal scutes, 65 pairs; upper labials, 7; lower 

 labials, 8; preoculars, 2; postoculars, 2; temporals, 1 + 1+2 

 (labials, oculars, and temporals the same on each side) ; dor- 

 sal scale rows, 17, changing near the posteritjr end of the 

 body to 15. General color alx)ve (in alcohol) a deep glaucous- 

 gray.- extending on the sides over about half of the lowermost 

 row of scales; ];elow cream color forward over the chin and 

 including the lower portions of the upi)er labials, suffused with 

 reddish towards the posterior end of the I)ody and under the 



2 Colors are based on Ridgway's Color Standards and Color Xo- 

 mcnclatnrc, igii:. 



