880 13. COLUBRIDA 
Distribution.—This beautiful little snake ranges from 
Kansas and Texas west to Arizona. In the latter state it has 
been taken in Pima County, where we found it under stones 
on the banks of the Santa Cruz River near Tucson, and in 
Ventana Canyon near the base of the Catalina Mountains. 
McLain records a specimen taken in the mountains near 
Tempe, Maricopa County. 
I have received a specimen from St. George, Washing- 
ton County, Utah. 
Remarks.—This Tantilla is readily distinguished from 
the Californian 7. eiseni by its fewer gastrosteges (135 to 
148 as against 167 to 181). Tantilla planiceps of Lower 
California has only 138 to 140 gastrosteges, but its nuchal 
collar is on the sixth and seventh rows of scales behind the 
parietals. 7. wilcox? has a larger number of gastrosteges 
(148 to 157) and the white collar crosses the parietals. 
202. Tantilla planiceps (Blainville) 
Lower CaALiFoRNIA TANTILLA 
Coluber planiceps Buatnvitte, Nouv. Ann. Mus. Hist. Nat., Vol. IV, 
1835, p- 294, pl. 27, figs. 3-3b (type locality, California); Barrp & 
Girarp, Cat. N. Amer. Rept., Pt. I, Serpents, 1853, p. 154. 
Homalocranion planiceps Dumérit, Mem. Acad. Sci. Paris, Vol. XXIII, 
1852, p. 490; Dumerit et Bisron, Erpétologie Générale, Vol. 
VII, 1854, p. 857; Jan, Arch. Zool. Anat. Phys., Vol. II, 1862, 
Pp- 51, 55; JAN, Elenco syst. degli Ofidi, 1863, p. 40; Jan & SorvELu, 
Iconogr. génér. des Ophid., 15e livr., 1866, pl. H, fig. 2; Bocourr, 
Miss. Sci. Mex., 1883, p. 581, pl. XXXVI, figs. 7-7d; BouLENGER, 
Cat. Snakes Brit. Mus., Vol. III, 1896, p. 226 (part); Mocquarp, 
Nouv. Arch. Mus. Hist. Nat., Ser. 4, Vol. 1, 1899, p. 316. 
Tantilla planiceps Cops, Proc. Acad. Nat. Sci. Phila., 1861, p. 74; Cope, 
Journ. Acad. Nat. Sci. Phila., 1875, p. 143; Yarrow, Bull. U. S. 
Nat. Mus., No. 24, 1883, pp. 13, 190; Garman, Mem. Mus. Compr. 
Zool. Cambr., Vol. VIII, No. 3, 1883, pp. 89, 163; Garman, Bull. 
Essex Inst., Vol. XVI, 1884, p. 31; Cope, Bull. U. S. Nat. Mus., 
