REPTILES. 39 



PLESTIODON FASCIATUS. 



Laccria fasciata, LirfN. Syst. Nat. I, 1758, 990. 



Scincus fanciattis, Holbkook, N. Am Herp. II, 1842, 127; pi. xviii. 



Laceria quinquiliitcata, Linn. Syst. Nat. 1766, 366. 



Scinctts quinqitdineatus, Holerook, N Am. Herp II, 1842, 121 ; pi. xvii. 



Plestiodon ergtlirucephilus, Molbrook, N. Am. Herp. 11, 1842, 117; pi. xvi. 



31T6. Fort Smith. Dr. Shumard. 



PLESTIODON OBSOLETUS, B. & G. 



riestiodon ohsoklum, B & G Pr. A. N. Sc. VI, August, 1852, 129. 



3113. Coal creek, Arkansas. B. Mollhaiisen. 



This specimen is very young and is the only one in the collection which exhibits the typical 

 coloration of the siiecies. 



LYGOSOMA LATERALE, D urn. Bib. 



Scincus lateralis, Sav, Long's Exped. II, 1823, 324. — Holbrook, N. Am. Herp. II, 1st ed. I, 1836, 71. 

 Lygosoma lateralis, Du»i Bib Erp. Gen. V, 1839, 719. — Holbkook, N Am. Herp. II, 1842, 133; pi. xix. 



3132. Fort Inge, Texas.— 3135. San Antonio. Dr. Kennerly. 



CEOTALUS DUEISSUS, Linn.— Eattlesnake. 



Crotaliis diirissus, Listr. Syst. Nat I, 1766,372. — Holbrouk, N. Am. Herp. Ill, 1812,9; pi i.— B. & 6 Catal. 

 N. Am. Serpents, 1853, 1. 



Spec Char. — Head small, narrow; supereiliaries, frontals, and other large plates smooth and uncorrugated. Sub-orbital 

 chain continuous; two rows between this and the labials. Labials 12-14 above, 13-16 below. Dorsal rows of scales 23-25, all 

 carinated ; carinations of outer row obsolete. No defined light lines on head or body, and no lighter edgings to the plates of the 

 head ; tail black. Above yellow or yellowish brown, with a double dorsal series of brown or blackish confluent rhomboids, with 

 another series opposite on each side. A distinct narrow reddish dorsal stripe, three or four scales in width from head to tail. 

 A broad dark stripe from the lower and posterior angle of the orbit across the angle of the mouth ; this stripe sometimes 

 obsolete. — (Kennicott.) 



No. 277. Fort Smith, Arkansas. Dr. G. G. Shumard. 



CEOTALUS ATROX, B. & G. 



Crotalus atror, B & G. Catal. N. Am. Serp. 1833, 5. 



Spec. Char. — Nose broad, obtuse. Plates of head elongated and much imbricated ; two rather small anterior frontals in 

 contact ; two larger imbricated plates between these and each superciliary ; space enclosed occupied by scales of smaller size 

 but larger than those between the posterior half of the supereiliaries. Supereiliaries usually bordered by a row of larger 

 scales, of which the anterior is much largest. All the larger plates of the crown very much corrugated, and the anterior plate" 

 generally with their edges turned up ; this, together with their corrugated surfaces, presenting a very rough appearance. Three 

 rows (if scales between the sub-orbital chain and labials. Labials 1.5-lfi above, 15-17 below. Dorsal rows 25-27 j central row 

 strongly carinated, with additional smnll ridges converging to the apex of each scale. Tail with black rings. Color dull 

 yellowish brown, with a dorsal series of rhomboidal blotches, margined by lighter lines much the same as in C. aiiamanieus, but 

 [he lateral markings represented in C. ailamnnttus all obsolete. Abdomen without fpots. A single transverse light line on the 

 superciliary, sometimes obsolete. Light stripe from posterior angle of orbit below the superciliary to the upper labials in front 

 of the angle of the mouth. No light Hues in front of the no.stril, or llglit edgings on rostral — (Kennicott.) 



No. 4225. Eocky Dell creek, Indian territory. B. Mollhausen. 



