Cope.J ^20 [May 18, 



ASINEA. 

 Peropoda. 



I. Two well-developed lungs of unequal size ; no tracheal lung. 



Pytlionidm. 



Python regius Shaw ; P. molurus Linn. ; P. spilotes Lacep. ; Loxocemus 

 hicolor Cope. 



Boidm. 



Xiphosoma eaninum L. ; Epicrates cenchrid L. ; Ohilahothriis inornatus 

 Rein. ; Boa constrictor L. ; Eunecles murinus L. ; Eryx johnii Russ. 



Charinidm. 



Besides the absence of coronoid and supra and postorbital bones, this 

 family differs from the Boidte in the fusion of the nasal bones into a single 

 plate. Charina bottw Blv. 



II. One lung without rudiment of a second ; a tracheal lung extend- 

 ing from true lung, with which it is continuous, to throat. 



Ungualiidoe. 

 JJngualia maculata Bibr. ; TJ. ondanura Gray. 



COLUBROIDEA. 



I. Two well-developed but unequal functional lungs. 



XenopeltidcB. 

 Xenopeltis unicolor, Reinwt. 



II. One functional lung only ; the right rudimental lung sometimes 

 possibly with limited function. 



Colub7'idm. 



Lycodontinae. 



Lycodon aulicus L. ; Boaodon infernalis Gthr. ; Urieclds microlepidotus 

 Pet. ; Stenorhina centralis U. and B. 



Colubrinae. 



Elopops modestus G\\\v.* ; Coronella girundica Daud. ; Diaiiodon temi- 

 carinaius Cope ; Ficimia olivdcea Gray ; Salvadora bairdii Jan. ; Pityo- 

 2)his sayi Hobr. ; EpiglottopJds pleurosiictus D. and B. ; Spilotes corais 

 Cuv. ; S. piiUatus L. ; Goluher quadrilineatus Pallas ; C. obsolelus Say ; 

 G. quadrivittatus Holbr. ; Bascanium constrictor L. ; B. flagellum Cates- 

 bj^ ; B. mentovariam D. and B. ; Zamenis atrovirens Shaw ; Z. korros L. ; 



* Positiou uncertain ; jierhaps a Lycodontine. 



