MEXICAN SNAKES AND CROCODILIANS — SMITH 

 Table 27. — Variation in Pituophis catenifer affinis 



459 



All the above specimens have four prefrontals; the fourth supra- 

 labial only enters the eye in all except two, in which the fifth also 

 enters the orbit; in four specimens there is an azygous scale. 



♦PITUOPHIS CATENIFER SAYI (Schlegel) 



Eight Mexican 65 specimens in the Museum are from San Antonio, 

 Chihuahua (No. 1519) G6 ; Castanuelos, Coahuila (No. 1539 [2J); 

 Presidio del Norte, Chihuahua (No. 1542) ; and "Mexico" (Nos. 1415, 

 29347-9). 



PITUOPHIS DEPPEI DEPPEI (Dumeril) 



Three male specimens come from Tacicuaro, Michoacan (No. 

 110888) ; Chalco, Mexico (No. 110889) ; and 30 km. north of Puebla 

 (No. 110887). Scale counts of these, in order listed, are: scale rows 

 27-29-21, 27-29-21, 25-28-21 ; ventrals 224, 216, 218; caudals 61, ?, 59; 

 supralabials 8-?, ?-?, 8-?; infralabials 12-?, ?-?, 12-13; spots on 

 body and tail 38-13, 30-?, 35-13. The two from Michoacan and 

 Puebla have the posterior spots black (also the anterior), as is typical 

 of deppei, but the Michoacan specimen (a juvenile measuring 437 mm. 

 in total length) has all the spots brown, dark-edged. This condition 

 may be typical of the young, as three other young specimens (Ada 

 Magdalena, Durango, and "Chihuahua") have spots of similar nature. 



The Museum has 12 other specimens G7 from Distrito Federal : 

 Mexico City (No. 12731 [2] ) . Durango : Ada Magdalena (No. 46365) . 

 Guanajuato (Nos. 11355, 16442). Jalisco: Atemajac (No. 46385); 

 Guadalajara No. 24969). Michoacan: Acambaro (No. 46557). 



«°Stull, 1940, p. 114-116. 



65 Type of Ghurchillia beUona Baird and Girard, 1852, p. 350. 



87 Stiill, 1940, p. 40. 



