26. DIADOPHIS 653 
Coronella regalis Boutencer, Cat. Snakes Brit. Mus., Vol. II, 1894, 
p- 208. 
Diadophis regalis arnyi Corr, Report U. S. Nat. Mus. for 1898, 1900, 
p- 745, fig. 156 (part). 
Diadophis punctatus Dirmars, Reptile Book, 1907, p. 338 (part). 
Description—Top of head flattened posteriorly, curv- 
ing slightly downward to the broad, rounded snout. Rostral 
rather large, much broader than high, bounded behind by 
internasal, anterior nasal and first labial plates. Plates on 
top of head are a pair of internasals, a pair of prefrontals, 
a rather short, broad frontal, two rather narrow supraoculars, 
and a pair of large, long parietals. Anterior and posterior 
nasals distinct or united above nostril. One loreal, small 
and nearly square. Preoculars two, rarely one. Postoculars 
two. Temporals usually one followed by one, sometimes 
1+2. Supralabials normally seven, rarely eight, the fifth 
and sixth usually largest, the third and fourth normally 
reaching eye. Infralabials usually eight or nine, the first 
pair meeting on the midline. Genials in two pairs, the 
posterior shorter. Scales on body smooth, in 17 rows. Anal 
plate divided. Gastrosteges in the type and Arizonan speci- 
mens varying in number from 212 to 237. Urosteges in 
two series of from 58 to 72. 
The body is unicolor, greenish or grayish brown, usually 
with, but sometimes without, a light transverse collar on 
the neck. The head is brownish or olive above. The labials 
are lighter, marked with dark brown or black. The lower 
surfaces and the outer row of scales are whitish, yellow, 
orange or red, often with black spots on the head, first row 
of scales, and gastrosteges. 
lengthy: toy anusseeewueen ech eee 470 578 620 
en gth ofa tar eecmeaees er tench se 100 79 119 
Distribution—The Sonoran Ring-necked Snake has 
