1884.1 1^^ [Cop •. 



\ 



I. A frontoparietal fontanelle. 



Inguinal glands Pleurodema. 



No inguinal glands Liujyerus. 



II. Frontoparietal bones ossified. 



Inguinal glands Paludicola. 



M Boulenger has shown that the genera established on the degree of 

 development of the metatarsal shovels are not tenable. 

 Leftodactylus ocellatus Linn. 

 Leptodactylus mystacinus Burm. 

 PsEUDis paradoxa Laur. 



ReptiUa. 

 AnOPS KINGII Bell. 



The genera of the Araphisbaenidoe, besides the Lepidosterninse, are the 

 following, as they appear to me : 



I. The nasal plates lateral, separated from each other on the median 

 line. 



a. Nasals separated by the rostral. 

 Rostral with a median cutting edge, extending between the frontonasals ; 



Anops Bell. 

 Rostral flat, not extending between frontonasals Diplialus* Cope. 



aa. Nasals separated by the frontonasals. 



Frontonasals united into one plate ; no frontals ,Blanus Wagl. 



Frontonasals united ; frontals present Caclea Gray. 



II. The nasal plates in contact with each other on the median line. 

 a. Preanal pores present. 



Nasal plates distinct Amphisbmna Linn. 



' ' Nasal plates united. ' ' Gray Typfiloblanus Fitz. 



Nasals, frontonasals and anterior labials united Ophioproctes Boul. 



aa. No preanal pores. 



Nasal plates distinct Aporavhus Cope. 



Amphisbmna trachura, sp. nov. 



Before giving the detailed characters of this species, I will compare all 

 the true Amphisbfense of which I can obtain information. "With extended 

 explorations this number has so increased, that new definitions are 

 needed. 

 I. No supraorbital plates (Amphisbcena). 



A- A preorbital plate. 



A suborbital plate ; caudal rings 26 ; anal pores 8.^. subocularisFelers 



A suborbital ; caudal rings 24 ; anal pores 4 A. mildei Peters. 



No suborbital plate ; 4 superior labials, last largest ; 3 inferiors, first 

 very large ; a large temporal on each side A. kraussi Peters. 



* Type Diphalus fenestratus Cope. Proc. Acad. Phila., 1861, p. 76; Amphisbana 

 antillensis R. &, L. 



