114 synopses and descriptiona 



Crotalus confluentus. 



Crotalus confluentus Say, 1823, Lomfs Exp. II, 48. 



Distinguished from atrox by the subdivision of the liead-sliiekls, a greater 

 shortening of the spots in the dorsal series, and the ashy colors. The num- 

 ber of spots and bands is increased. Internasals divided so as to place 

 small plates between them and the nasals. Loreals two or one^the upper 

 being united with the small prefrontal. A single scale between the anterior 

 suborbital and the labial. Labials 14 — 17. Scales in 25 — 29 rows, outer 

 two or three smooth. Ventrals 178 — 1864-19 — 27, posterior subcaudals 

 bifid or entire. Spots in dorsal series 41 — 54. Young with the white line.s 

 very distinct on the head. A lot of specimens from the same locality have 

 the rows of scales in 25, in 27, and in 29 rows. 



Specimen 2455 {Mus. Comp. ZooL), taken near Ft. Hays, Kansas, by Mr. 

 J. A. Allen, has a supraciliary produced "as in C. cerastes, two loreals on one 

 side and one on the other, and 29 rows of scales. C. pyrrhus, I am inclined 

 to think, was founded upon an individual variation. 



Crotalus lucifer. 



Crotalus lucifer Baird & Gimrd, 1862, Prof. Ac. N. Sc., Phil., 177. 



Spots or rhombs broader than in atrox or conflnentus. Colors generally 

 darker. The black band fi*om the eye backward passes above the posterior 

 labials. Nasal and anterior laliial fi'equently separated by small scales. 

 One or two scales between the anterior suborbital and the labials. Loreal 

 one, sometimes two. Internasals subdivided, separated by a row of small 

 scales from the nasals (sometimes fi-om rostral also). Labials 13^16. 

 Scales in 25 (25—27?) rows. Veiitrals 169—179+19—24. Spots and 

 bands 30—42. Hab. 



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Crotalus exsul ». sp. 

 Comparatively slender; neck small; head large, broad behind, outline as 

 seen from above a suboval; snout short, broad; tail short. Eye moderately 

 large. Head covered with small imbricate striate scales; a pair of larger 

 ones in contact with the rostral and each other, another pair in contact with 

 the nasals, but separated by a \y,\\v of sm.ill prefrontals. A larger scale on 

 Cfich side between supraciliary and postnasal. Supraciliaries large, striate. 

 Rostral higher than wide, subtriangular, rather pointed above. Anterior 



