REPTILES. 39 



PLESTIODON FASCIATUS. 



Laccrtafusciata, LINN. Syst. Nat. I, 1758, 290. 



Scincus fasciatus, HOLBKOOK, N. Am Herp. II, 1842, 127; pi. xviii. 



Lacerta quinque.lincata, LINN. Syst. Nat. 17(50, 366. 



Scincus quinquclineatus, HOLBROOK, N Am. Herp II, 1842, 121 ; pi. xvii. 



Pltstiodon erythroceph ilus, HOLBROOK, N. Am. Herp. 11, 1842, 117; pi. xvi. 



3176. Fort Smith. Dr. Shumard. 



PLESTIODON OBSOLETUS, B. & G. 



Plestiodon obsolctum, B & G Pr. A. N. Sc. VI, August, 1852, 129. 



3113. Coal creek, Arkansas. B. Mollhausen. 



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

 coloration of the species. 



LYGOSOMA LATER ALE, Dum. Bib. 



Scincus lattrulis, SAY, Long s Exped. II, 1823, 324. HOLBIICOK, N. Am. Herp. II, 1st ed. I, 183G, 71. 

 Lygosoma lateralis, DUM BIB Erp. Gen. V, 1839, 719. HOLBROOK, N Am. Herp. II, 1842, 133; pi. xix. 



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



CROTALUS DURISSUS, Linn. Rattlesnake. 



Crotalus durissus, LINN. Syst. Nat I, 1765,372. HOLBROOK, N. Am. Herp. Ill, 1812,9; pi. i. B. & G Catal. 

 N. Am. Serpents, 1853, 1. 



SPEC. CHAR. Head small, narrow; superciliaries, frontals, arid 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. 



CROTALUS ATROX, B. & G. 



Crotalus atrox, B & G. Catal. N. Am. Serp. 1853, 5. 



SPEC. CHAR. Nose broad, obtuse. Plates of head elongated and much imbiicated ; two rather small anterior frontals in 

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

 but larger than those between the posterior half of the superciliaries. Superciliaries usually bordered by a row of larger 

 scales, of which the ante;ior is much largest. All the larger plates of the crown very much corrugated, and the anterior pl&amp;lt;ite u 

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

 rows of scales between the sub-orbital chain and labials. Labials 1&quot;:-1H above, 15-17 below. Dorsal rows 25-27; central row 

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

 yellowi&h brown, with a dorsal series of ihomboidal blotches, margined by lighter lines nnich the same as in C. adamanttus, but 

 t he lateral markings represented in C. iidamonttus all obsolete. Abdomen without cpots. A bingle transverse light line on the 

 (superciliary, sometimes obsolete. Light stripe fiom posterior angle of orbit below the i-upei ciliary to the upper labials in front 

 of the angle of the mouth. No light lines in from of the nostril, or light edgings on rostral (Kennicott ) 



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



