80. APOEOPHIS. 157 



N. Am. Rept. p. 77, pi. vi. fig. 6 (1883); H. Garm. Bull. Illin. 

 Lab. iii. 1892, p. 305. 

 Heterodon simus kennerlyi, Coues ^ Yarroiv, I. c. p. 271. 



Maxillary teeth 6 to 8 + 2. Hostral as broad as the distance 

 between the eyes ; several small shields separating the internasals 

 and the prefrontals ; frontal as broad as long or broader, shorter 

 than its distance from the end of the snout, as long as or longer 

 than the parietals ; eye surrounded by 10 or 11 shields in addition 

 to the supraocular ; eight upper labials ; one pair of chin-shields, in 

 contact with three or four lower labials. Scales all, except the 

 outer row, strongly keeled, in 23 rows. Ventrals 126-150 ; anal 

 divided ; subcaudals 32-45. Pale brown or yellowish above, with 

 three alternating series of brown spots, the median largest and 

 usually broadest ; a dark cross band between the eye, a broad oblique 

 band from the eye to the mouth, and three elongate blotches behind 

 the head ; belly yellowish white, with deep black blotches, or 

 entirely black in the middle. 



Total length 600 millim. ; tail 70. 



United States, west of the Mississippi, North Mexico. 



a. S (V. 148: C. 36). Kansas. Smithsonian Instit. [P.]. 



b-c, d. 2 (V. 138, 138, Duval Co., Texas. W. Taylor, Esq. [C.]. 

 141 ; C. 3o, 38, 38). 



e. Yg. (V. 126; C. 37). Texas. Smithsonian Instit. [P.]. 



(As typical of H. kennerlyi.) 



f. 2 (V. 138 ; C. 32), Texas. (One of the types oi H. cateshyi.) 



80. APOROPHIS. 



Herpetodryas, part., Schleg. Fhy.s. Serp. ii. p. 173 (1837). 

 Dromicus, part., Dum. Sf Bibr. Erp. Gen. vii. p. 646 (1854) ; Gi'mth. 



Cat. Col. Sn. p. 126 (1858) ; Jan, Elenco sist. Ofid. p. 66 (1863). 

 Lygophis {non Tsch.), part., Cope, Proc. Ac. Philad. 1862, p. 75. 

 Aporophis, part., Cope, Proc. Am. Philos. Soc. xvii. 1877, p. 34. 



Maxillary teeth 18 to 22, followed after an interspace by two 

 enlarged ones ; mandibular teeth subequal. Head narrow, slightly 

 distinct from neck ; eye large, with round pupil. Body cylindrical ; 

 slender; scales smooth, without apical pits, in 17 or 19 rows, 

 ventrals rounded. Tail rather long ; subcaudals in two rows. 



South America. 



Si/tiojJsis of the Species. 



Scales in 19 rows; ventrals 165-178 . . 1. lineatus, p. 158. 

 Scales in 17 rows; ventrals 157-178; 



frontal as long as the parietals 2. Jlavifrenatus, p. 158. 



Scales in 17 rows ; ventrals 155 ; 



frontal a little shorter than the 



parietals 3. coraUiventris, p. 159. 



Scales in 17 rows; ventrals 137-143; 



frontal as long as the parietals 4. amoenus, p. 160. 



