. The reptiles of western North America, an account of the species known to inhabit California and Oregon, Washington, Idaho, Utah, Nevada, Arizona, British Columbia, Sonora and Lower California. arger than lower, rarely united. Postoculars two,nearly equal. Temporals two followed by two, sometimes1+2 or 1 + 1. Eight, or rarely seven, superior, and nine or10 (rarely seven) inferior labials, seventh of upper and fifthof lower largest, fourth and fifth upper reaching eye, firstpair of lower meeting on median line. Genials in two pairs,anterior smaller than posterior. Scales on body smooth, infif
. The reptiles of western North America, an account of the species known to inhabit California and Oregon, Washington, Idaho, Utah, Nevada, Arizona, British Columbia, Sonora and Lower California. arger than lower, rarely united. Postoculars two,nearly equal. Temporals two followed by two, sometimes1+2 or 1 + 1. Eight, or rarely seven, superior, and nine or10 (rarely seven) inferior labials, seventh of upper and fifthof lower largest, fourth and fifth upper reaching eye, firstpair of lower meeting on median line. Genials in two pairs,anterior smaller than posterior. Scales on body smooth, infifteen rows. Anal plate divided. Gastrosteges varying innumber from 198 to 215. Urosteges in two series of from114 to 157. The color above is grayish or yellowish brown, palest onthe tail, the scales of the sides more or less yellow, and withnarrow dark lines along the middle of each row. Thesedark lines are sometimes present on the dorsal scales as wellas on those of the sides, and a wider line often runs alongthe tips of the gastrosteges. The yellow of the lateralscales is variable in intensity, and sometimes—especially in Oc. Papers, Cai,. Acad. Sci., \ ul. X I \an DhmuR(.h Plate 70 1^. Cj 2 28. COLUBER 687 young—forms a distinct line along the third and fourthrows of scales. All of these lines fade out on the tail. Thehead is spotted with yellow. The lower surfaces are yellowor yellowish white, marked with slate or black anteriorlyand along the tips of the gastrosteges, and often more orless tinted, especially posteriorly, with delicate rose pink. Length to anus 772 803 859 910 940 971 Length of tail 339 350 358 366+ 418 362 Distribution.—This species ranges from Texas, NewIMexico and Colorado west to California, and north toIdaho. In Arizona, it has been secured at Fort Whipple andPrescott, Yavapai Countyj Oak Creek, Coconino County jand at Carrs Ranch, Sierra Ancha, Gila County. In Utah, specimens have been collected at Ogden,Weber County; Fort Douglas, Salt Lake Coun
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Keywords: ., bookcentury1900, bookdecade1920, booksubject, booksubjectserpents
