478 PROCEEDINGS OF THE NATIONAL MUSEUM vol.63 



In head pattern these specimens agree exactly with the types of 

 rubricata. The dark head cap (which is dark gray, not jet black) 

 fades below the level of the orbit on the sides of the head, reaching the 

 tip only in the posterior temporal region. The light nuchal collar is 

 distinct, with a narrow, dark posterior border, and involves the tips 

 of the parietals. 



In head pattern it is impossible to allocate these specimens with any- 

 thing but w. rubricata. From this, however, they differ in having the 

 mental separated from the chinshields (separated on one side in the 

 type), and in having more numerous ventrals (140, 144, 146 in other 

 w. rubricata, as against 145 to 155 in the present series). In spite of 

 these differences I believe it best to associate these specimens with 

 w. nibricata; the total range in ventral counts is not unduly large, and 

 the mental character is admittedly variable. They have nothing to 

 do with bocourti, which has divided secondary temporals, as that species 

 has 164 or more (to 185) ventrals. T. deviatrix has a broader collar and 

 different head pattern, as well as perhaps a higher average number of 

 ventrals (154 to 160). T. atriceps has a narrower collar and fewer 

 ventrals (139 or less, with no close approach to w. rubricata when sexes 

 are separated). Apparently the only other form approached by these 

 specimens is w. wilcoxi; their higher counts nearly or quite reach those 

 of the latter race. Three males of w. toilcoxi have 152 to 155 ventrals, 

 and one has 62 caudals (145 to 152 ventrals, 54 to 59 caudals, in four 

 w. rubricata) ; three females of w. icilcoxi have 159 to 164 ventrals, and 

 two have 64 and 67 caudals (146 to 155 ventrals, 51 to 55 caudals, in four 

 w. rubricata). 



TANTILLITA LINTONI (Smith) 



Tantilla lintoni Smith, Proc. Biol. Soc. Washington, vol. 53, pp. Gl-62, fig. 1, 1940. 

 TuntilUta lintoni Smith, Journ. Washington Acad. Sci., vol. 31, pp. 115-117, 1941. 



The type (No. 108603) was found at night wriggling over the surface 

 of leaves near a trail near Piedras Negras, Guatemala. 

 The Museum has no others of the species. 



♦THAMNOPHIS ANGUSTIROSTRIS (Kennicott) 



A single specimen, the only known, is in the Museum, from Alamo do 

 Parras, Coahuila (No. 959, type). 88 



THAMNOFHIS CHRYSOCEPHALUS (Cope) 



Three specimens were secured, one above Acultzingo, Veracruz (No. 

 110774), the other two at Ptijaro Verde, Puebla (Nos. 110775-6). 



The Museum has 12 other specimens, from the states of Veracruz 

 (Orizaba, Nos. 7077 [6], 30494 [type] 89 ), Oaxaca (Mountain Zempoal- 



M Kennicott, 1S60, p. 332; Smith, 1942f, pp. 120-121. 

 89 Cope, 1885a, pp. 173-174. 



