132 SYSTEMATIC LIST ANP SYNONYMY. 



P H I D I A— Continued. 



BOAEIDAE 8 



Boidae Bonap., 1S31, Saggio, — 1840, Roy. Acad. Turin. 

 Boa 



Linn., 175S, Systerna, I, 214, — 1706, Syst., I, 373 (Part) ; Gray, 1825, 

 Ann. Phil., 209; Wagler, 1830, Syst. Amph., 168; D. & B. ; 1844, 

 Erp., VI, 500. 



Boa imperator 8 



Daudin, 1803, Kept., V, 150; D. & B., 1844, Erp., VI, 519; Gray, 1849, 

 Cat. Snakes, 101 ; Jan, 1857, Ind. Sist. Rett. Mus. Milan, 44, — 1863, 

 Sist., 23, — 1864, Icon., livr. 6, pi. 1, — 1S65, Icon., Text, 81 ; Sumi- 

 chrast, 1880, Bull. Soc Zool. de France, 179. 



Central America and Mexico. 



Boa constkictor 



Boas constrictor Linn., 1754, Mus. Ad. Fridr., 38. Boa constrictor Linn., 

 175S, Syst., I, 373; Schneider, 1801, Amph., II, 247; Fitz., 1826, Neue 

 Class., 54; Wagl., 1830, Syst., 163 ; P. & B., 1S44, Erp., VI, 507 ; Gray, 

 1849, Cat. Sn., 100; Jan, 1864, Icon., livr. 5, pi. 2, f. 2. 



Brazil to Central America. 



Var. isthmica 9 



Central America. 



Boa mexicana (Rapp) 10 



Boa dwiniloquax var. mexicana Jan, 1863, Sist., 23, — 1S64, Icon., livr. 

 5, pi. 4, f. 1, — 1865, Icon., Text, 82. 



Chilabotheus 



Pum. Bibr., 1S44, Erp., VI, 562. 



Body stout, slightly compressed; neck smaller; head broad, de- 

 pressed; tail rather short. Nostrils lateral, anterior. Eyes small, 

 pupil vertical. Anterior teeth larger. Labials imbricate, without 

 pits. Crown-shields large, irregular. Scales smooth, flat. Subcaudals 

 simple. Claws distinct. 



Chilabothrus inornatus 



D. & B., 1S44, Erp., VI, 563; Jan, 1S63, Sist., 24, — 1864, Icon., livr. 6, 

 pi. 5, f. 1. Boa inornata Reinh., 1843, Dansk. Vid. Selsk., pi. 21-23. 

 Body stout, slightly compressed; head distinct, crown flat, snout 

 broad; tail short, prehensile, rather thick at the extremity. Rostral 

 large, pentangular, wider at the suture with the labial and nasal. 

 Nasal divided in three — upper portions largest and meeting between 

 internasals and rostral, or in two — anterior part much larger and reach- 

 ing from the anterior labial to the opposite nasal. Internasals and 

 -: : prefrontals large, subequal or subdivided. Frontal and supraciliaries 



large, the former often dissected. Parietals irregular, becoming scale- 

 like posteriorly. Loreal large, elongate, sometimes supplemented by 

 small shields. Anteoculars two, upper larger. Postoculars usually 

 four. Temporals scale-like. Labials commonly eleven, the sixth 

 touching the eye. Infralabials about thirteen, anterior four or five 

 broad, anterior pair meeting behind the mental. Mental furrow r deep. 

 Submentals small. Scales smooth, flat, in 36 to 40 rows, outer and 



