NATURAL SCIENCES OF PHILADELPHIA. 307 



ge.neinls longer than pregeneials ; superior labials eight ; 

 loreal higher than long, olivaceous, with one row of small 

 black spots below, and two rows above the lateral stripe. 

 Two small black nuchal spots and a short postoral pale 

 crescent macrostemma.* 



Scales in twenty-one rows, lateral stripe on the second and 

 third. 



Frontal plate shorter than common occipital suture; tempo- 

 ral small, superior labials eight, postgeneials equal or 

 shorter than pregeueials. Ashy, sometimes brown, with 

 narrow, unmargined stripes and very small lateral spots 

 in two rows vagrans. 



Heterodon nasicus B. & G. Stansbury's Explorations, 1852, 352. 



Proteroglypha. 



Elans e u r y x a n t h u s Kennicott, Proc. Acad., Philada., 18G0, 337. 

 T*wo specimens. Fort Whipple. 



Solcnoglypha. 



(Jaudisona molossus Bd., Gird., Catalogue. Baird, U. S. Mex. Bound. 

 Surv., Tab. 

 Two specimens ; dry rocky ground, San Francisco Mountains. 



Caudisona scutulata Kennicott, Proc. Acad. 1861. 



One specimen, twenty inches long; San Francisco Mountains. 



Caudisona confluenta Say, Long's Exped. Rocky Mts., ii. 1823,48. Baird 

 and Girard, Catalogue, 8. 



Four specimens of this species, which correspond more or less closely with 

 Say's diagnosis, one of them especially, in having the cervical maculae con- 

 fluent into a band. The animal called by this name by Baird and Girard, and 

 named Q. lecontei by Dr. Hallowell, which is found on the eastern slopes of 

 the Rocky Mountains and the central plains of Kansas, Missouri, etc., differs 

 from the Arizona form, as I pointed out in t^ynopsis of Crotali in Mitchell's Re- 

 searches, not having then seen specimens of the latter ; yet the two are pro- 

 bably varieties of but one species. They differ as follows : 



Var. confluenta: sixteen superior labials, (eight to) ten rows of scales 

 between superciliaries ; ground color above bluish slate, no yellow band be- 

 tween eyebrows, on rostral, or margining labials in front. Spaces between 

 dorsal spots orange 



"San Francisco Mountains (510). No. 801 under a log on a mountain, 

 altitude 12,000 feet. 572. No. (378, thirty-one inches long, had an adult Sialia 

 m e x i c a n a in its stomach." 



Var. lecontei: fourteen superior labials, six between superciliaries. Ground 

 color, and space between spots brown ; a yellow margin to mouth and rostral 

 plate, and band between supercilia. 



No specimens from Arizona. 



Caudisona 1 u c i f e r Baird and Girard, Catalogue, p. 



The numerous specimens of this species brought from Arizona by Drs. 

 Coues and Irwin are nearly black, especially the head. 



509 511, etc., San Francisco Mountains. 



* In Mus. Smithsonian there are two varieties, neither of which agree strictly with Kennicott's 

 type. First, the two from Dr. CoueS. in which the lateral spots are minute, not in contact, and 

 the dorsal vitta more or less black margined; and second, three specimens from Mirador, Vera 

 Cruz, Dr. Sartorius. In these the spots are quadrate, large, including the inferior row; those 

 of the two superior in contact at their angles. Gastrostega of the first 163, of the latter 100. 



1866.] 



