190 k:;itii,i.v: oriiiniA. — xxvui. 



r. Prefrontals 2 pairs ; loral single ; prefrontals 4 or more (scalos 25 to 



35; V. 1'. '2U0 to 200) I'lTU.u-iiih, 283. 



rr. Prefrontals 1 pair; nasals 2: posterior teeth rather larger; vivipa- 

 rons (scales 10 to 21 ; V. P. 140 to 180). . . Tham.noi-his, 270. 

 gq. Dorsal scales not keeled, rather loosely imbricate; head short (V. 1'. 

 IfiO to 240). 

 s. llostnil plate not acute. 



t. Loral jiresent (scales 21 to 25) Lamproi'EI.tis, 285. 



tt. Loral absent (scales 19) OsCEOLA, 286. 



M. Kostral plate acute, the snout sharp-pointed (scales 19). 



Cemopiiora, 287. 

 jy. Rostral plate (at tip of snout) produced, recurved and keeled; dorsal 

 scales keeled; anal |)late divided; head broad and short; some of the 

 posterior teeth enlarged (scales 23 to 27 ; V. P. 120 to l.')0). 



Ilhn-ERODON, 288. 



The following purely artificial key may aid in finding the names 

 of specimens : — 



I. Dorsal scales not keeled ; anal plate bijid. 



a. Scales 13; V. P. about 130; color brownish . CARnioPHioPS, 269- 

 aa. Scales 15 to 17. 



b. Ventral plates about 120; brownish Vikoima, 271. 



bb. V. P. about 140. 



c. Blackish, with yellow collar. Diadoi-his, 284. 



cc. Green ; no collar Lioi-eltis, 281. 



bbb. V. P. about 185; blue-black, young blotched. Bascanion, 282. 

 aan. Scales 19; V. P. about 180. 



d. Blue-black with three red lines AnASTOR, 270. 



dd. Blue-black with square red spots on sides. . . Farancia, 272. 

 aaaa. Scales 25 to 29 (median dorsal scales faintly keeled). 



Caluoi'ELTis, 279. 



n. Dorsal scales Pot at nil keeled; anal plate entire. 

 e. V. P. about 170 to 205; siiout not .sharp. 



/. Scales 19; red, black-banded Osceola, 286. 



/y. Scales 21 to 25; black, brown, or red, mostly varicfjatod. 



LA.MrittiiKr.Ti9, 285. 

 ee. V. P. 160 to 170; scales, 19; snout sharp; red with black rings. 



Cemopiiora, 287. 



Ilf. Dorsal scales more or less keeled; anal plate entire. 



g. Scales 19 to 21 ; V. P. about 155; stri|>ed. . . TuAM.Norms, 270. 

 yg. Scales 25 to 35 ; V. P. about 220; blotched. . . PiTUDrm.'*, 283. 



IV. Dorsal scales keeled; anal plate biJid. 

 h. Scales 15 to 17. 



i. Tail at>out J of length; V. P. 155; green. . OriiKonRYS, 280. 

 a. Tail not J of length; browni.ih. 



j. Loral absent Stdrekia, 274. 



ij. I>.ral present Haldea, 273. 



A/(. .Scnl.s I'.t to 21. 



k. V. P. about 135; blotched (.Losorilis, 275. 



