702 Bulletin American Museum of Natural History |Vol. XLVI 



The true status of C. goldmani, therefore, remains to be cleared up, and in 

 naming it, I hope to have emphasized the fact that it presents a problem 

 for investigation. 



Key to the Species of Crotalus in Lower California and Adjacent Islands 



1 . Superciliary scales produced into a horn-like process C. cerastes. 



Superciliary scales flat 2. 



2. Nasal plate separated from the rostral by one or two rows of small scales .... 3. 

 Nasal in contact with the rostral 4. 



3. Supraocular a single shield C. mitchellii. 



Supraocular broken up into several plates C. goldmani. 



4. Top of head anteriorly with three pairs of enlarged scales in contact. . C. molossus. 

 Top of head anteriorly with small scales 5. 



5. Rostral wider than high , C. enyo. 



Rostral higher than wide (rarely nearly as wide as high) 6. 



6. Canthus rostralis often ill-defined; coloration reddish, markings indistinct in 



adult ; pattern of side of head as in C. atrox C. exsul. 



Canthus rostralis distinct, dorsal rhombs distinct 7. 



7. Tail light with three to six black rings; light postsuperciliary line reaches the 



scale row next to the labials anterior to the angle of the mouth . (C. atrox) . 8. 



Tail with more numerous crossbands, less sharply defined; postsuperciliary 



line passes behind angle of mouth C. oreganus. 



8. Dorsal rhombs with a light spot on each side (as in C. molossus), sometimes 



confluent C. tortugensis. 



Dorsal rhombs not as above 9. 



9. Ventral plates 197-200 C. atrox elegans. 



Ventral plates fewer, maximum 195 10. 



10. Dorsal rhombs sharply defined; light borders well defined laterally. 



C. atrox lucasensis. 

 Dorsal rhombs less distinct, especially at the sides, the coloration without strong 



contrast C atrox atrox. 



Crotalus tortugensis is not sufficiently characterized to make its 

 place in the above key certain; I have tentatively placed it as an ally to 

 C. atrox. 



Testudinata 

 Pseudemys ornata nebulosa (Van Denburgh) 



Chrysemys nebulosa Van Denburgh, 1895, p. 84, Pis. iv-vi. 

 Pseudemys ornata nebulosa Stejneger and Barbour, 1917, p. 120. 



Range. — Southern Lower California. 



Lower Californian Records. — Los Dolores, Agua Caliente, San Jose del 

 Cabo, Van Denburgh, 1895, p. 85. 



