910 16. CROTALIDjE 



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 (145 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'. — Rostral wider than high; dark markings more 

 or less indefinite, cross-banded posteriorly. 

 C. tigris.— p. 9+7. 

 fff . — 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. 

 '. — Rostral separated from anterior nasal by granular scales. 

 C. mitchellii.— p.949. 



