33. P1TUOPHIS 729 



manni and P. catenifer catenifer. No sharp lines can be 

 drawn between the subspecies, for one changes gradually 

 into another. P. catenifer catenifer, with its fewer gastro- 

 steges and many blotches, P. catenifer heermanni, with 

 fewer gastrosteges and fewer spots, and P. catenifer deserti- 

 cola with more gastrosteges and fewer spots, all intergrade. 

 As yet, too few specimens from Idaho are at hand to 

 enable one to state to which subspecies they should be re- 

 ferred. They may perhaps belong here, but the few speci- 

 mens I have seen seem more like the snakes of Utah than 

 like those of Nevada. 



1 62 Pituophis catenifer stejnegeri Van Denburgh 

 UTAH GOPHER SNAKE 

 Plate 77 



Pityophis bellona COPE, Ann. Rep. U. S. Geol. Surv. Terrs., 1871 (1872), 

 p. 468. 



Pityophis sayi bellona, COPE, Bull. U. S. Nat. Mus., No. I, 1875, p. 39 

 (part); YARROW, Surv. W. looth Merid., Vol. V, 1875, p. 540 

 (part); YARROW, Bull. U. S. Nat. Mus., No. 24, 1883, p. 106 (part); 

 COPE, Report U. S. Nat. Mus., for 1898, 1900, p. 872 (part). 



Pityophis sayi sayi YARROW, Bull. U. S. Nat. Mus., No. 24, 1883, p. 105 

 (part). 



Pityophis catenifer bellona BROWN, Proc. Acad. Nat. Sci. Phila., 1901, 

 p. 54 (part). 



Pituophis catenifer deserticola VAN DENBURGH & SLEVIN, Proc. Cal. 

 Acad. Sci., Ser. 4, Vol. 5, No. 4, 1915, p. 107, pi. 14, fig. 5; PACK, 

 Copeia, 1919, No. 68, p. 16. 



Pituophis catenifer annectens VAN DENBURGH & SLEVIN, Proc. Cal. 

 Acad. Sci., Ser. 4, Vol. 9, 1919, p. 216 (part). 



Pituophis catenifer stejnegeri VAN DENBURGH, Proc. Cal. Acad. Sci., Ser. 

 4, Vol. X, No. i, 1920, p. 21, pi. 2, fig. i (type locality, Fort Doug- 

 las, Salt Lake County, Utah); (?) VAN DENBURGH & SLEVIN, 

 Proc. Cal. Acad. Sci., Ser. 4, Vol. XI, 1921, pp. 40, 45. 



Description. Head somewhat flat-topped, with snout 

 projecting and rather narrow. Temporal regions not swol- 



