MEXICAN SNAKES AND CROC0DIL1ANS — SMITH 489 



(the loss caused by fusion of the sixth and seventh labials in two, 

 by second and third in two, and by fourth and fifth in one; in one 

 the sixth labial is eliminated from the labial border by contact of 

 5 and 6) ; in 13 (85,59) there are 7-8, and in three (25,1?) there 

 are 8-8. In all the preoculars are 1-1, the postoculars 2-2; in all 

 but three the temporals are 1-2, and in the exceptions they are 1-1. 

 Without exception the loreal is present on both sides. All have 2 

 internasals and 2 prefrontals; in one a large, azygous scale between 

 the prefrontals is partially formed. In no specimen do the pre- 

 frontals contact the labials. The second supralabial contacts the pre- 

 ocular on one side in 9 (59,45 ) , on both sides in 13 (1 9 , 12 $ ) . 



The percent of the total length comprised by the tail length varies 

 from 12.8 to 17.5 in females, and from 16.8 to 21.7 in males. The 

 percentages tend to increase more sharply and over a longer period 

 In males than in females, as shown in figures 14, 15. The maximum 

 percentages in males are reached at about 250 to 275 mm. total length, 

 while in females they are readied at about 210 to 245 mm. snout to 

 vent. 



One specimen (No. 110746) has a number of well-developed young, 

 nearly ready for birth, in the uteri. 



TOLUCA LINEATA WETMOREI, new subspecies 



Holotype.— U.S.N.M. No. 110727, male, collected at Pan de Olla, 

 Veracruz. 



Paratijpes — Sixty-eight, including U.S.N.M. Nos. 110726, 110728-43, 

 and Univ. Mich. Mus. Zool. No. 89370 (13), all topotypes, collected 

 March 22, 1940, by Dyfrig McH. Forbes, Luis, Gilberto, and Gavino 

 Gurcia, and H. M. Smith; U.S.N.M. Nos. 46405, 46442, EHT-H.M.S. 

 No. 16241, Las Vigas, Veracruz; Mus. Comp. Zool. No. 45685, 

 Tequeyutepec, Veracruz ; and E.H.T.-H.M.S. Nos. 23693-5, 27917-28, 

 27939-57, near Tezuitlan, Puebla. 



Diagnosis. — Like Toluca I. Uneata, except infralabials generally 

 (94 percent) 6-7 or less; differing from I. varians and I. acuta in 

 this character and in pattern and number of ventrals and caudals. 



Description of holotype. — Rostral protruding, pointed, not turned 

 upward, its length visible from above about equal to its distance 

 from frontal; two internasals, almost as long as prefrontals, not 

 extending so far laterally as latter; frontal hexagonal, with an obtuse 

 angle anteriorly, an acute one posteriorly, sides slightly convergent ; 

 length of frontals (3.2 mm.) very slightly less than that of parietals, 

 considerably greater than its distance from tip of snout (2.5 mm.) ; 

 nasal entire, in contact with preoculars, narrowed posteriorly; pre- 



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