910 16. CROTAL1DJE 



i. Light postocular line one scale wide; dark 

 postocular band arising below anterior 



corner of eye. 



C. confluentus. p. 926. 



i*. Light postocular line, if present, more 

 than one scale wide; dark postocular band, 

 if distinct, arising below middle of eye. 

 j. Not from southern Lower California; 

 lateral spots not so well defined; color- 

 ation much less ornate. 



C. oreganus. p. 930. 



j'. Cape Region of Lower California; 

 lateral spots darker brown in greater 

 contrast; coloration more ornate. 

 C. enyo. p. 945. 



h'. Gastrosteges fewer (14-5 to 160); a verti- 

 cal white line across middle of rostral, con- 

 tinuing onto lower jaw and expanding be- 

 tween two wide dark bars which extend 

 about halfway back on the lower jaw; two 



white lines on side of head. 



C. willardi. p.958. 



g 1 . Rostral wider than high; dark markings more 

 or less indefinite, cross-banded posteriorly. 



C. tigris. p. 947. 



f ff. Dorsal blotches small, in two series. 



C. pricei. p. 963. 



ee'. Intervals between dorsal dark blotches much 

 greater than length of blotches along midline. 



C. lepidus. p. 961. 



b'. Outer edge of supraocular plate, raised into a horn- 

 like process. 



C. cerastes. p. 953. 



a*. Rostral separated from anterior nasal by granular scales. 



C. mitchellii. p.949. 



