27. HETERODON 



the labials. Temporals numerous. The scales arc keeled, 

 with two apical pits. The anal plate is divided. The 

 urosteges are in two series. The eye is of moderate size, with 

 round pupil. The dentition is dicranterian. There are four 

 North American species, of which one occurs in Arizona. 



143. Heterodon nasicus Baird & Girard 



Western Hog-nose Snake 

 Plate 62 



Heterodon nasicus Baird & Girard, Stansbury's Exp. Surv. Great Salt 

 Lake, 1852, p. 352 (type locality, Texas); Baird & Girard, Cat. N. 

 Amer. Rept., Pt. i, Serp., 1853, p. 63 (type from Rio Grande); 

 Hallowell, Sitgreaves' Exped. Zuni and Colorado Riv., 1853, 

 p. 147; Baird & Girard, Marcy's Exp. Red River, 1854, p. 193, pi. 4, 

 Hallowell, Proc. Acad. Nat. Sci. Phila., 1856, p. 249; Baird, Rep. 

 Pacific R. R. Surv., Vol. X, 1859, p. 19, 41; Baird, U. S. Mexican 

 Bound. Surv., Vol. II, Rept., 1859, p. 18, pi. XI, fig. i; Hayden, 

 Trans. Am. Philos. Soc, 1862, p. 177; Jan, Elenco Syst. degli Ofidi., 

 1863, p. 46; Jan & Sordelli, Iconogr. Gener. Ophid., loe livr., 

 1865, PI. V, fig. I ; Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 307; 

 Allen, Proc. Boston Soc. Nat. Hist., 1874, p. 69; Cope, Proc. U. S. 

 Nat. Mus., Vol. XIV, 1892, p. 644; Boulenger, Cat. Snakes Brit. 

 Mus., Vol. II, 1894, p. 156; Cockerell, Amer. Nat., Vol. 

 XXX, 1896, p. 326; Brown, Proc. Acad. Nat. Sci. Phila., 

 1901, p. 90; Brown, Proc. Acad. Nat. Sci. Phila., 1903, p. 551; 

 Branson, Kansas Univ. Sci. Bull., Vol. II, No. 13, 1904, p. 376, 

 fig. 10; Bailey, N. Amer. Fauna, No. 25, 1905, pp. 28, 35, 45; 

 MozLEY, Trans. Kansas Acad. Sci., Vol. VI, reprint, 1906, p. 34; 

 DiTMARS, Reptile Book, 1907, p. 384, pi. CXV; Ellis & Hender- 

 son, Univ. Colorado Studies, Vol. X, No. 2, 1913, p. 95, pi. VI; Van 

 Denburgh & Slevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. 3, 1913, 

 p. 393; Strecker, Baylor Bulletin, Vol. XVIII, No. 4, 1915, p. 41; 

 Stejneger & Barbour, Check List N. Amer. Amph. Rept., 1917, 

 p. 77; Ruthven, Occas. Papers Mus. Zool. Univ. Michigan, No. 

 66, 1919, p. 2. 



Heterodon kennerlyi Kennicott, Proc. Acad. Nat. Sci. Phila., i860, p. 

 336 (type locality, Rio Grande & Sonora); Jan & Sordelli, 

 Iconogr. Gener. Ophid., loe livr., PI. V, fig. 2. 



Heterodon simus nasicus Cope, Bull. U. S. Nat. Mus., No. i, 1875, p. 43; 

 Yarrow, Surv. W. looth Meridian, Vol. V, 1875, p. 555; Coues, 



