144 SYSTEMATIC LIST AND SYNONYMY, 



O P H I D I A— Continued. 



(Tretanorhinus.) 



Helicops variabilis 33 



Tretanorhinus variabilis D. & B., 1854, Erp. Gen., VII, 349 ; Jan, 1863, 

 Sist., 76. Helicops agassiza Jan, 1863, Sist, 76, — 1868, Icon., livr. 28,' 

 pi. 2, f. 1. Tretanorhinus variabilis var. adnexus Jan, 1863, Sist., 76. 



Nicaragua to Mexico. 



Helicops nigeoluteus 



Tretanorhinus nigroluteus Cope, 1861, Pr. Ac. Phil., 298. 



Head narrow, slightly distinct. Bostral broader than high, sepa- 

 rated from internasals by the nasals. Nasal in two parts, nostril 

 between. Prefrontals as long as frontal. Anterior border of frontal 

 equal to lateral. Loreals two, anterior smaller. Oculars 2 — 2. La- 

 bials 8, fourth in orbit. Infralabials 10. Scales keeled, in 21 rows. 

 Ventrals 136. Anal bifid. Black above; yellow beneath; punctu- 

 lated anteriorly, punctulations forming bands near the flank. 



Central America. 



Helicops allenii 34 



Carman, 1874, Pr. Bost. Soc, 92; Cope, 1875, Checklist, 43. 



Florida. 



Hydrops 34 



Wagler, 1830, Arnph., 170; Gray, 1842, Zool. Misc., 67; Fitz., 1843, 

 Syst, 25 ; Gray, 1849, Cat. Serp., 75. 



Hydrops erythrogrammus 35 



Coluber erythrogrammus Latr., 1802, Rept, IV, 141; Daud., 1803, Eept, 

 VII, 93, pi. 83, f. 2 ; Harl., 1827, Jour. Phil. Ac, 361 ; Holbr., 1836, 

 Herp., I, 115, pi. 22. Abastor erythrogrammus B. & G., 1853, Serp., 

 125; Bd., 1859, P. E. E. Eep., X, pi. 33, f. 93; Gray, 1849, Serp., 78; 

 Gthr., 1858, Cat., 275. Calopisma erythrogrammus D. & B., 1854, Erp., 

 VII, 336; Mart, 1856, Mus. Berl., 27; Jan, 1863, Sist, 75, —.1868, 

 Icon., livr. 29, pi. 4, f. 2, pi. 5, f. 1. Homahpsis erythrogrammus Boie, 

 1827, Isis, 551. Helicops erythrogrammus Wagl., 1830, Amph., 170; 

 Holbr., 1842, Herp., Ill, 107, pi. 25. Homalopsis plicatilis var. Schleg., 

 1837, Essai, 173, II, 353. Natrix erythrogrammus Merr., 1820, Amph., 

 117. 



Illinois and Virginia southward. 



Hydrops abacurus 36 



Coluber abacurus Holbr., 1836, Herp., I, 119, pi. 23. Hydrops abacurus 

 T>. & B., 1854, Erp., Atlas, pi. 65. Calopisma abacurum D. & B., 1854, 

 Erp., VII, 342 ; Mart., 1856, Mus. Berl., 27. Helicops abacurus Holbr., 

 1842, Herp., Ill, pi. 26. Hydrops reinwardtii Gray, 1842, Zool. Misc., 

 67. Homalopsis reinwardtii Schleg., 1837, Essai, I, 173, II, 357. 

 Farancia fasciata Gray, 1849, Cat., 74; Gthr., 1858, Cat, 275. Faran- 

 cia drummondi Gray, 1842, Zool. Misc., 68. Farancia abacurus B. & 

 G., 1853, Serp., 123; Bd., 1859, P. E. E. Eep., X, pi. 33, f. 92. Calo- 

 pisma reinwardtii Jan, 1863, Sist, 75, — 1868, Icon., livr. 29, pi. 6, f. 

 1-2. 



The Carolinas to Texas,, 



