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CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



fairly large number of gastrosteges, and indistinct dorsal lines. 

 More material is needed to clear up their status. 



Certain specimens from Requa and Crescent City in Del 

 Norte County, California, show intergradation between T. o. 

 atratus and T. o. ordinoides. This is apparent in the reduction 

 in the number of upper and lower labials, and, sometimes, of 

 the gastrosteges. Some of the specimens from these localities 

 are fairly typical T. o. atratus, and nearly all are closer to that 

 form than to T. o. ordinoides. The scale-counts in these two 

 series of specimens are given below. Nos. 29076 to 29091 are 

 from Requa and Nos. 29219 to 29230 were collected at Cres- 

 cent City. 



It now is well known that variation in the coloration of the 

 snakes of this subspecies is very great. Certain types of colora- 

 tion may be pointed out as occurring in groups of specimens. 

 The best known of these color types, perhaps, is that in which 

 the general color is dark olive, lateral lines absent, dorsal line 

 yellow and very broad, throat bright yellow, and belly deep 

 olive or slate with or without a median yellow streak. This is 

 the coloration of the types of this subspecies, which types Cope 

 redescribed as Entcenia infernalis vidua. It is not a common 

 style of coloration in this subspecies since we find it more or 

 less well marked in only Nos. SR.21, S1654, S1655, S4322, 

 S5180, SR.68, SI 198, S4149, S4155, S1200, S1201, 



