lino REPORT OF NATIONAL MUSEUM, 1898. 



diately bordered by a narrow line lighter than the ground color, as in C. 

 confiuentus, C. a. atrox, and C. a. adamanteus, this line being about a hali 

 scale in width. Posteriorly the light intervals between the rings widen 

 to three or three and a half scales, while the rings themselves become 

 much narrower, being only two to three scales wide. On the middle 

 third of the body below, and oi)i)osite to the dorsal series, is another 

 row of small rhomboidal or sometimes triangular brown blotches on 

 each side. They involve four to six scales and extend from the second 

 to the fifth lateral row of scales, and are bordered by light lines like 

 the dorsal series, from which the^^ are separated by a single scale. 

 Indications are seen of another series of small blotches resting directly 

 upon the abdominal scutella*, alternating with and a little lower than 

 the first lateral series. The abdomen is whitish yellow without dis- 

 tinct blotches. A light line from posterior angle of superciliary and 

 orbit to angle of jaw above labials, and another from before the eye to 

 labials. The markings of the head of this species seem to be very 

 nearly the same as in C. lucifer. There is, however, indications of a 

 light border to the external edge of the suj)erciliary, and the rostral 

 and entire space in front of the nostril and i)it, as well as a little pos- 

 terior to these, is as dark as the crown, while in G. lucifer they are dis- 

 tinctly lighter. 



Though this subspecies so closely resembles G. adamanteus atro.v, itAvill 

 be readily distinguished by the large plates of the head and by the dor- 

 sal rhombs being more imperfect in their outlines anteriorly and poste- 

 riorly. The type specimen (Oat. No. 5021), and another (Oat. No. .S(5(>9), 

 might be properly referred to Section I of the genus with the C. moJos- 

 sus, since the anterior head scuta are quite identical with those of that 

 group, but Oat. Nos. 14225 and 14278 show division of tliese plates. 

 The tendency to form parietal scuta is peculiar to this subspecies. Like 

 the G. molossus, its habitat is on either side of the United States and 

 Mexican boundary, where it is not uncommon. I have not seen speci- 

 mens from south of the city of Ohihuahua. Dr. Boulenger' records it 

 from Huamautla. 



Cat. Nos. Scales. Upper labials. Ga.strosteges. ITrostejces. Length, Tail, Kattle, 



intti. iHiH. Ill III. 

 5021 25. 14. 176. 23. 



14225 25. 15. 171. 20. 



14278 25. 15. 171. 22. 986. 114. 48. 



Crotalus adamanteus scutulatus Kennicott. 



' Catalogue of the Snakes of Ilni I'.ritisli Miis<'imi, III, ]i. 575. 



