264 Dr. A. Giinther on Reptiles and Fishes 



2. Monitor niloticus, L. 



3. Poromera Fordii, Hallow. 



4. Mabouia Raddonii, Gray. 



5. Oymnodactijlus fasciatus, D. B. 



6. Polemon Barthii, Jan. 



7. Coronella fuliginotdeSj Gthr. 



8. Grayia Smythti, Leach. 



9. Hydrcethiops melanogaster, Gthr. 



10. Hapsidophrys lineatus, Fisch. 



11. Philothamnus nitidus, Gthr. 



12. Lycophidium t'rroratum, Leach. 



13. Dipsadoboa assimilis, Matschie. 



14. Naja melanoleuca, Hallow. 



15. Vipera nasicornis, Shaw. 



16. Atkeris cmisolepis, Mocq. 



17. Corniifer Johnstonii, Blgr. 



18. Rana crassipes, Ptrs. 



Before passing on to the Fishes I offer remarks on a few 

 of these species. 



Poromera. 



Poromei-a, Boul. Liz. iii. p. 6. 



Nostril between two nasals and the suture between rostral 

 and first labial. Lower eyelid scaly. Collar present. Back 

 covered with scales larger than those of the tail, and strongly 

 keeled, the keels forming continuous longitudinal ridges ; 

 sides with much smaller scales ; ventral scales rather large, 

 imbricate, keeled, the keels again forming continuous series. 

 Fingers and toes slender, with a double series of smooth, very 

 small scutes beneath. Femoral pores ; no inguinal pores. 

 Tail long, cylindrical. 



Poromera Fordii. 



Tachydromus Fordii, Hallow. Proc. Ac. Nat. Sci. Philad. 1857, p. 48. 

 Poromera Fordii, Boul. /. c. 



General aspect of a Tachydromus. 



The scutes on the upperside of the head show longitudinal 

 ridges either along the middle or concentric with their 

 margins. The anterior nasal meets its fellow in the median 

 line behind the rostral. Anterior frontal longer than broad; 

 an unpaired small scute between the posterior frontals. Ver- 

 tical bell-shaped, twice as long as broad ; a pair of anterior 

 occipitals, half the size of the posterior, between which a 



