13. COLUBRID 645 
e.—Rostral turned up at tip; scales in 17 rows. 
Ficimia.—p. 777. 
c’.—Loreal plate present. 
dd.—Pupil round. 
ee.—Rostral not free at edges. 
ff.—Normally one anterior temporal; urosteges 
fewer than 75; scales in 15 or 17 rows. 
g.—No narrow light transverse nuchal collar; 
fourth infralabial usually largest; preocular 
normally single and temporals 1+2. 
h.—Snout more or less depressed; each gastro- 
stege not marked with a transverse blackish 
bar. 
Sonora.—p.858. 
h’.—Snout high; each gastrostege with a narrow 
transverse blackish bar. 
Contia.—p. 770. 
g.—A narrow light transverse nuchal collar; 
fifth infralabial usually largest; preoculars 
normally two, and temporals 1+1. 
Diadophis.—p. 647. 
ff’.—Anterior temporals normally more than one; 
urosteges more than 75; scales in 15 or more 
rows; no single narrow nuchal collar. 
gg.—Scales in fewer than 23 rows; gastrosteges 
fewer than 240. 
Coluber.—p. 658. 
gg.—Scales in more than 30 rows; gastrosteges 
more than 240. 
Elaphe.—p.697. 
ee.—Rostral large, with free lateral edges; colora- 
tion in longitudinal bands. 
Salvadora.—p. 688. 
dd’—Pupil vertically elliptical. 
