MEXICAN SNAKES AND CROCODILIANS — SMITH 



455 



acters whatever that might serve to distinguish the southern 

 population. 



The Museum has no others from Mexico. 



NATRIX RHOMEIFERA BLANCHARDI Clay 



One specimen referred to this form is from Huichihuayan, 42 km. 

 north of Tamazunchale, San Luis Potosi (No. 110512). It is typi- 

 cal, with the belly practically unmarked; it has 25-25-20 scale rows; 

 ventrals 141; tail broken; supralabials 8-8; infralabials 11-12; pre- 

 oculars 1-1; postoculars 3-3; one anterior temporal; 22 maxillary 

 teeth; female. 



The Museum has one other specimen (No. 46533, a para type 01 ), 

 from Tlacotalpam, Veracruz. 



♦NATRIX VALID A (Kennicott) 



The type (No. 1309), 62 from Durango, and one specimen (No, 

 31384) from Colima, are in the Museum. 



NINIA DIADEMATA DIADEMATA Baird and Girard 



Sixteen specimens are from the following localities : Tequeyutepec, 

 Veracruz (Nos. 109808-10) ; Cuautlapan, Veracruz (Nos. 109811-22) ; 

 and Piedras Negras, Guatemala (No. 109807). 



Supralabials 5-5 in one, 5-6 in one, 6-6 in 14; infralabials 6-6 in 

 13, 6-7 in two, 7-7 in one; a small preocular split off corner of pre- 

 frontal in one; in another a small preocular wedged between labial, 

 loreal and orbit; prefrontal separated from orbit (by contact of 

 supraocular and loreal) on one side in one, on both sides in another; 

 postoculars 1-1 in two, 1-2 in one, 2-2 in 13. Variation in ventral 

 and caudal counts is given in table 25. 



Table 25. — Variation in Ninia diademata 



61 Clay, 1938, p. 252. 



63 Kennicott, 1860, p. 334. 



