THE CLASSIFICATION OF THE OPHIDIA. 215 



Cyclopias aestims L., N. America. X 4. 

 PhyllorJiynchus brownii Stejn., Arizona. X 4. 

 LeptopJiis ahcetulla L., Brazil. X 3. 

 Leplophis prcestans Cope, Central America. X 3. 

 Thrasops flavigularis Hallow., W. Africa. X 3. 

 Dendrophis picta L., India. X 3. 

 Bucephalus capensis Thunb., S. Africa. X 3. 

 Dasypeltis palmarum Leach, W. Africa. X 4. 

 Cemophora coccinea Blum., Florida. X 4. 



Plate XX. 



COLUBRIN^. 



THmetopon pliolepis Cope, Costa Rica. X 4. 

 Gonopsis nasus Gthr., Mexico. X 4. 

 Osceola elapsoidea Holbr., Florida. X 4. 

 Osceola doliata triangulum Boie, New York. X 4 

 Ophibolus rhombomaculatus Holbr., D. Cal. X 2. 

 Ophibolus calligasler Say, Kansas. X 3. 

 Ophibolus getulus Linn., N. America. X 2. 

 Ooronella girundica Dund., Italy. X 3. 

 Proterodoa tessellatus Hallow., Japan. X 3. 

 Dianodon rufozonaius, Cantor, China. X 3. 

 Symphimus leucostomus Cope, Mexico. X 3. 

 Rhinochilus leconteiB. & G., Texas. X 3. 



Plate XXI. 



COLUBRINiE, NATRICINiE. 



Eerpetodryas melas Cope, Costa Rica, x 2. 

 Drymobius rhombifcr Gthr., Ecuador, x 4. 

 Coluber emoryi B. & G., Texas. X 4. 

 Liopeltis vernalis Harl., United States, x 4. 

 Acanthocalyx ventrimaculatus Grajr, W. Asia. X 4. 

 Tylanthera florulenta G-eoffr. , W. Asia. X 4. 

 Contia episcopa Kenn., Texas, x 4. 

 Ophibolus californice DeBlv., Lower California, x 2. 

 Adelphicus quadrimrgatus Jan., Centr. America. X 3. 

 Ablabes baliodirus Boie, Malaysia, x 4. 

 Eutmnia multimaculata Cope, Chihuahua. X 4. 



Plate XXII. 



Natricin^k 

 Owing to the position of the basal section the basal hook was in some cases lost. 

 1. Matrix rhombifera Hallow., Texas, x 3. 

 Natrix vulgaris Laur., Italy, x 4. 

 Eutmnia sirtalis L., N. America, x 4. 

 Eutmnia melanogaster Wiegm., Mexico. X 4. 

 Natrix kirtlandii Kenn., N. America, x 4. 

 Bothrodytes ceylonemis Gthr., Ceylon. X 4. 

 A. P. S. — VOL. XVIII. 2b. 



