420 



PROCEEDINGS OF THE NATIONAL MUSEUM 



There is a significant difference in number of ventrals, but this 

 is not one than can certainly be used in identifying specimens. In 13 

 specimens of sJevini (6 counts from Slevin, 1926, p. 201) the ventrals 

 vary from 182 to 202, average 189.7, while the average in stuarti is 

 182.9. In the latter 86 per cent are less than 185, while in slevini 76.9 

 per cent are 185 or more. 



DRYADOPHIS MELANOLOMUS TEHUANAE, new subspecies 



Holotype.—U.S.'NM. No. 110917, from Cerro Guengola, Oaxaca. 



Paraty pes. —Twenty, including U.S.N.M. Nos. 110909-16, from 

 Tres Cruces, Oaxaca, and Nos. 110918-23, La Conception, Oaxaca; 

 and U. M. M. Z. Nos. 82546-52, from Tres Cruces, San Pedro, and Mix- 

 tequilla Mountains, Oaxaca. All these localities are in the vicinity of 

 Tehuantepec. 



Table 10. — Variation in Dryadophis melanolomus tehuanae 



Diagnosis. — Like D. m. stuarti, except caudals 103 to 112, as opposed 

 to 113 to 118 of the first. 



Description of holotype.—A female with 17-17-15 scale rows, 186 

 ventrals, 107 caudals, 9-9 supralabials (fourth, fifth, and sixth enter- 

 ing orbit), 10-10 infralabials, 1-1 preoculars, 2-2 post-oculars, and 

 2-2 temporals. 



