AMPfflBIA AND REPTILL\ OF COLORADO 73 



and keeled ; ventral scales smooth, closely set and of rather uniform size 

 and shape ; nasal openings on the canthi rostrati ; gular fold prominent. 



Length of the head 2 to 3 in the maximum A\idth of the body, i to 

 1 . 25 in the maximum -vsddth of the head; tail short, i . 20 to 1.75 in 

 the maximum width of the body. 



Color grayish to blackish, varying toward brown; a lighter mid- 

 dorsal streak; under parts whitish. 



Average specimens, about 100 mm. 



The specimen from Monarch contained 14 tenebrionid beetles, 

 Eleodes sp. and a large number of ants. 



This species is viviparous. The young, which usually number less 

 than twelve, are born in the middle or late summer. 



Range, Oregon to Arizona, east to Kansas. 



Two forms of this species may be recognized, a plains form and an 

 upland form, scarcely entitled to recognition as subspecies. 



a. Occipital spine more nearly vertical than the last temporal spine when the 

 head is viewed from the side; tail shorter than the hind limb; plains form. 



P. h. ornatissimum (Girard). 



aa. Occipital spine and the last temporal spine directed backward at about the 



same angle when seen from the side; tail equal to or longer than the hind 



limb; upland form P. h. her nandesi {Girard). 



Colorado specimens. — University Museum: Boulder, September 7, 1907 

 (45 mm.), W. H. Foster, No. 218; Boulder, August 28, 1908 (95 mm.), A. L. 

 Goodrich, No. 219; Owens Lake, Boulder County, August, 1908 (78 mm.), F. 

 Rohwer, No. 220; Boulder, August, 1908 (90 mm.), F. Rohwer, No. 221; two 

 miles southeast of Meeker, August 8, 1909 (72 mm.), VV. W. Robbins, No. 59; 

 four miles east of Wellington, June 13, 1911 (100 mm.), J. Henderson, No. 222; 

 Cottonwood Springs, north of Ft. Morgan, June 22, 1912 (95 mm.), J. Henderson, 

 No. 223; Colorado State Historical and Natural History Museum: Denver, July, 

 1873 (90mm.), Mary G. Smith; Denver, August 2, 1900 (120mm.), W. C. 

 Fenil; Denver, May 20, 1903 (2 specimens, 95 and 100 mm.), W. C. Ferril; 

 Denver, Capitol Grounds, August 14, 1903 (9 specimens, 80-120 mm.), W. C. 

 Ferril; LaVeta Pass, August 21, 1903 (60 mm.), C. E. Langerr; Antonito, August 

 22, 1903 (90 mm.), H. G. Smith; Hugo, June 9, 1906 (no mm.), W. C. Ferril; 

 Colorado Museum of Natural History: Trinidad, August, 1909 (26 specimens, about 

 25 mm.), L. J. Hersey; Agricultural College Museum: Cortez, August 13, 1903 

 (120 mm.), S. A. Johnson; private collection of A. G. Vestal, Monarch, Boulder 

 Cotmty, May 17, 1912 (115 mm.), A. G. Vestal; State Teachers' College Museum: 



