708 13. COLUBRIDZ 
Pityophis sayi bellona Yarrow & Hensuaw, Ann. Rep. Chief of Engi- 
neers for 1878, Surv. W. tooth Merid., Appendix NN, 1878, p. 212 
(part); Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, p. 106 (part). 
Pityophis catenifer catenifer Brown, Proc. Acad. Nat. Sci. Phila., 1901, 
p- 53 (part). 
Pituophis catenifer catenifer GRINNELL & Camp, Univ. Cal. Publ. Zool., 
Vol. 17, No. 10, 1917, p. 193 (part); Sreynecer & Barsour, Check 
List N. Amer. Amph. Rept., 1917, p. 85; VAN Denpurcu & SLEvin, 
Proc. Cal. Acad. Sci., Ser. 4, Vol. IX, 1919, p. 211, pls. XI, XII, 
fig. 1 (part); Van Densurcu, Proc. Cal. Acad. Sci., Ser. 4, Vol. X, 
No. I, 1920, p. 13. 
Description.—Head rather flat-topped or rounded, with 
snout projecting and rather narrow. Temporal regions not 
swollen. Rostral plate very large, prominent, not very 
narrow but often recurved between internasals on top of 
snout; bounded behind by internasal, anterior nasal, and 
first labial plates. Plates on top of head are a pair of inter- 
nasals, four, two, one, three, five, six, or eight prefrontals, 
a frontal, supraocular of each side, and a pair of parietals. 
Anterior and posterior nasals usually distinct, sometimes 
united. Loreal usually elongate. One or usually two pre- 
oculars, and two to five, usually three, postoculars. Tips 
of some labials often cut off, forming suboculars or loreals. 
Seven to 10, usually eight, and 10 to 14, usually 13 or 12, 
inferior labials, next to last superior and sixth or seventh 
inferior usually largest in its series, fourth or fifth superior 
usually reaching eye, first pair of inferior meeting on median 
line. Temporals in first row varying from two to six, 
usually four or three, very variable. Two pairs of genials, 
anterior much larger than posterior. Scales on body in 29 
to 33 rows, usually 31, keeled except in a varying number 
(about three to 10) of rows on each side. Anal plate not 
divided. Gastrosteges varying in number from 200 to 230, 
males having from 207 to 230, females from 200 to 230. 
