558 PROCEEDINGS OF THE ACADEMY OF 



This species bears considerable resemblance to T. occidentalis, but is 

 distinguished by prominent characters. 



In the animal which is the subject of this description, an entozoon (Pentas- 

 tomum gr acile) had entered the right internal nostril, and penetrating the 

 membranes of the meatus near its anterior orifice, had attached itself to the 

 periosteum in the right posterior sinus of the intermaxillary bone. The body 

 of the animal entirely filled the meatus; and extended as far as the mouth of 

 the cesophagus of the serpent. 



Gastropyxis nobis. Type G. smaragdina. 



Supra p. 556. 



184. G, smaragdina nofe. Dendrophis smaragdlnus Boie, 1827. Schlegel, 

 1837. Leptophis gracilis Hallow., 1844. Leptophis smaragdinus Dum. & Bibr,, 

 1854. Ahaetulla smaragdina Gthr., 1858. 



Four sp. Gaboon, W. Africa. Dr. Ford. 



One sp. Guinea. Mr. Du Chaillu. 



One sp. Liberia. Dr. Goheen. 



Oae sp. ? ' 



COL UBRINjE. 

 Prymnomiodon nobis. Type P. chalceus. 



Form slender, head moderately distinct. Cephalic plates normal : two nasals, 

 a loreal, one preocular. Scales carinate, arranged quincunially, those of the 

 vertebral series not larger. Gastro- and urosteges not aDgulated ; ihe latter 

 divided, the postabdominal plate entire. Pupil round. Palatine teeth very 

 little longer than pterygoids. Superior maxillary teeth minute posteriorly, 

 becoming much longer anteriorly; none grooved. 



In the system of the Erpetologie Generale, this genus might be placed near 

 Eugnathus D.#B. Its true affinities are not with Euprotodon and Lycophidium, 

 but with Thrasops Hallow., and Thamnophis Fitz. (Eutoenia B. & G.), 

 being distinguished from the latter principally by the dentition. 



185. P. chalceus nobis. 



Similar in appearance to Thamnophis proximus nobis. Muzzle rather 

 narrow ; rostral plate nearly as high as broad. Vertical rather large, its 

 lateral borders converging, presenting a right angle posteriorly. Nasals 

 equal in size. Loreal trapezoid, posterior inferior angle acute, Preocular 

 not reaching vertical. Three postoculars. Eight superior labials, eye resting 

 on fourth and fifth. Nine or ten inferior labials ; post-geneials separated, longer 

 than the anterior. Scales in nineteen longitudinal rows, elongate, emarginate 

 at the tip, those of the external row not larger than the others, keeled. Gas- 

 trosges 152; urosteges? (tail mutilated). Length of body 11 in. 8 1. 



Coloration. Olivaceous above, shading into leek green upon the flanks, and 

 greenish-white upon the belly. A vertebral band of light green bordered with 

 black extends from the occipital plates to the origin of the tail, involving one 

 and two halves rows of scales. Another narrower and paler band extends upon 

 the third and fourth rows of scales upon each side from the neck to origin of 

 tail. This band is bounded above by an interrupted narrow black border. 

 Temporal region lively green, plates of head and muzzle tinged with fulvous. 

 Upper labials and preocular white : a narrow black postocular vitta. All the 

 plates and scales above and below, refulgent with a brilliant metallic lustre, as 

 in Ahaetulla sp. 

 One sp. Siam. Dr. W. S. W. Ruschenberger. 



Philodryas Wagler. Type P, 1 f e r s i i. 

 Nat. Syst. Amphib. 185, 1830. Chlorosoma lb. 1. c. Dryophylax Dum. & Bibr. 

 Erp. Gen. vii. 1103, 1854, nee Wagler, 1820. 



[Dec. 



