290 COLTTBRtD^. 



a. $ (Sc. 19; V. 138 ; St. Louis, Missouri. Dr. S. Garman [P.]. 

 0. 36). 



b. 2 (Sc. 19 ; V. 138 ; St. Louis, Missouri. A. Erwin Brown, 

 0. 36). Esq. [P.]. 



19. AMPHIARDIS. 



Amphiardis, Cope, Proc. U.S. Nat. Mus. xi. 1888, p. 391, and xiv. 

 1891, p. 675. 



Teeth, equal. Head small, not distinct from neck ; eye small, 

 with . round pupil ,: no preeocular ; loreal and prsefrontal entering 

 the eye. Body cylindrical ; scales keeled, in 17 rows ; ventrals 

 rounded. Tail short; subcaudals in two rows. Hypapophyses 

 developed throughout the vertebral column. 



Texas. 



This genus appears to be intermediate between Ischnognaihus and 

 Haldea, agreeing with the former in having two internasals, with 

 the latter in the absence of preeoeular. 



1. Amphiardis inornatus. 



Virginia inornata, Garman, N. Am. Sept. p. 97 (1883). 

 Amphiardis inornatus, Cope, U. cc. 



Head subcorneal ; snout short, blunt. Eostral very small, not 

 reaching the top of the head ; loreal elongate ; one postocular ; 

 temporals 1 + 1 ; five upper labials, third and fourth entering the 

 eye ; posterior chin-shields half as long as the anterior'. Scales 

 keeled, lustrous, in 17 rows, outer row faintly keeled. Ventrals 

 125-129 ; anal divided ; subcaudals 36. Uniform brownish olive 

 above, whitish beneath. 



Total length 260 miUim. ; tail 45. 



Near Dallas, Texas. 



20. HALDEA. 



Calamaria, part., Sohleg. Fhys. Serp. ii. p. 25 (1837). 

 Conocephalus (non Thumb.)., Bum. ^ Bibr. Mem. Ac. Sc. xxiii 



1853, p. 442, and Brp. Q&n. vii. p. 138 (1854) ; Ounth. Cat. Col. 



Sn. p. 17 (1858) ; Jan, Arch. Zool. Anat. Fhys. ii. 1862, p 24 • 



Bocourt, Miss. Sc. Mex., Sept. p. 541 (1883). 

 Haldea, Baird §• Gir. Cat. N. Am. Rept. p. 122 (1853). 

 Falconeria, Theob. Cat. Rept. As. Soc. Mus. p. 44 (1868). 

 Potamophis, Garman, Bull. Essex Inst. xxiv. 1892, p. 106. 



Maxillary teeth very small, subequal, 16 to 18 ; anterior mandi- 

 bular teeth a little larger than the posterior. Head small, not 

 distinct from neck ; eye small, with round pupil ; a single inter- 

 nasal ; no prseooular, loreal and prsefrontal entering the eye. Body 

 cyKndrical; scales keeled, without apical pits, in 17 rows ; ventrals 

 rounded. Tail short ; subcaudals in two rows. Hypapophyses 

 developed throughout the vertebral column. 



North America. 



