(Rossman, 1976, Occ. Pap. Mus. Zool. LSU 50:1-15). 
1976 H. petersi Rossman, Occ. Pap. Mus. Zool. Louisiana St. Univ. 
50:2. Type-locality: Ecuador, Napo, E. bank Rio 
Misahualli, 1l mi NE Tena. Distribution: eastern Andean 
foothills, Ecuador. 
1975 H. yacu Rossman & Dixon, Herpetologica 31(4):412. 
Type-locality: Peru, Loreto, Moropon. Probably = H. 
pastazae, fide Rossman & Abe, 1979, Proc. Louisiana 
Acad. Sci. 42:7-9. Distribution: only from type locality 
Hydrodynastes Fitzinger, 1843, includes Cyclagras Cope, 1885, fide 
Hoge, 1966, Cien. Cult. 18(2):143. 
Hydrops Wagler, 1830. 
nyerops 
Ha triangularis bolivianus Roze. Distribution: northeastern 
Bolivia to Corrientes, Argentina. 
Hypsiglena Cope. 
Not included in Costa Rican fauna by Savage, 1980, Handlist Key 
Herpetofauna Costa Rica. 
Imantodes A. Dumeril, 1853. 
Recently revised with the addition of a new species, updated 
synonymies and a key, Myers, 1982, Amer. Mus. Novit. 2738:1-50. 
I. cenchoa (Linnaeus). No subspecies recognized; combine 
synonymies of leucomelas & semifasciatus with cenchoa. 
Distribution: from Veracruz, Mexico, to northern 
Argentina. 
I. gemmistratus (Cope). Question the validity of subspecies, 
hence have omitted names in Zweifel and Stuart cited by 
Myers, op. cit (P.E.V.). Combine synonymies and add: 
1899 Himatodes hemigenius Cope, Bull. Philadelphia Sicixs Muise 
1:16. Type-locality: Santa Clara, Costa Rica. 
Distribution: from Sonora and Veracruz, Mexico, to 
northern Colombia. 
I. inornatus (Boulenger). Distribution: Nicaragua to 
northwestern Ecuador. 
I. lentiferus (Cope). Distribution: Amazonian South America 
and Guianas. 
1982 I. phantasma Myers, Ibid. 2738:3. Type-locality: "southeastern 
slope of Cerro Cituro, a peak on the northern end of the 
Serrania de Pirre, Province of Darien, Republic of 
Panama", 1030 m. Distribution: only from type-locality. 
Incaspis Donoso-Barros, 1974, Neotropica 20(16):14. Type-species: 
I. cercostropha Donoso-Barros, 1974, op. cit. = 
Philodryas Wagler, 13.30 3 .hisdiel  Thioma:s) 5, 15947 7a; 
Copeia(4):648-52. 
1974 Incaspis cercostropha Donoso-Barros, Ibid. 20(16):14 = 
Philodryas simonsii Boulenger, fide Thomas, 1977, 
Ibid. (4):648-52. 
Lachesis Daudin, 1803. 
L. muta noctivaga Hoge = L. m. rhombeata Wied, fide Hoge & 
Ne} 
