6 University of Michigan 



on the ends of the ventrals, and one on the posterior end of 

 most of the dorsal scales of the lowermost row on each side. 

 Total length, ^^yj millimeters; tail length, 8i millimeters. Sex, 

 male. 



Diadophis amabilis occidentalis, new subspecies 



Diagnosis: The chief characteristics of this form are a rela- 

 tively broad, uninterrupted neck ring, j]/? to 2 scales in width, 

 ventral color extending over i^S to 2 of the dorsal scale rows, 

 flecks of black on the first two rows of dorsal scales, belly 

 lightly spotted with black, and the dorsal scales in not 

 more than 15 rows. This form is intermediate between D. 

 amabilis vandcnbnrgii and D. amabilis pulchcllus. From the 

 former it differs in possessing not more than 15 rows of dorsal 

 scales, in having a neck ring that averages slightly wider, and 

 in having the ventral color extending on the average a little 

 higher on the sides. From D. aumbilis pulcliellus it differs 

 chiefly in having the light colored dorsal scale rows flecked 

 with black; it also diff'ers from this form in having on the 

 average more black spots on the belly, a slightly narrower neck 

 ring, and a lesser extent of ventral color on the sides. 



Type Specimen : ^luseum of Verteljrate Zoology, Univer- 

 sity of California, number 7260; collected by H. E. Wilder, 

 May 30, 1 9 19. 



Type Locality: Bridgeville, Humboldt County, California. 



Range: From Sonoma County northward through Mendo- 

 cine County, California, and perhaps to the Columbia River. 



Description of Type Specimen: Ventral plates, 197; anal 

 plate dividefl ; caudal scutes, 55 ; upper labials, 7 ; lower labials, 

 8 on the left side and 7 on the right; preoculars, 2; ])ostocu- 



