2. EAN4.. 41 



male is proTided with an external vocal vesicle behind each angle 

 of the mouth. Upper part of each flank with a well-marked row of 

 pores, which does not exist in R. halecina. 

 United States. 



42. Rana areolata. 



Rana areolata, Baird *§- Gir. Proc. Ac. Philad. 1852, p. 173 ; Baird, 

 V. S. Mex. Bound. Sui-v. pi. 36. f. 11, 12. 



Appears to be closely allied to R. halecina and utricidaria, but the 

 head is larger and the spots of the hack are smaller and more 

 numerous. Male with an external vocal vesicle on each side behind 

 the angle of the mouth. 



South of North America. 



43. Rana halecina. 



Rana halecina, Giinth. Cat. p. 13. 

 Rana halecina, Kalm, Her Amer. iii. p. 46 ; Daud. Bain. p. 63, and 



Bept. viii. p. 122 ; Merr. Tent. p. 175 ; Holbr. N.-Amer. Herp. i. 



p. 89, pi. 13 ; Tschudi, Batr. p. 79 ; Bum. df Bihr. p. 352 ; Delcay, 



N. Y. Faun., Bept. p. 62, pi. 22. £ 60 ; Cooper, U. 8. Expl. Surv. 



xii. part ii. pi. xxix. f. 1 ; Brocchi, Miss. Sc. Me.r., Batr. p. 10. 



virginiana, Laur. Si/n. Bept. p. 31. 



pipiens, Gmel. S. N. iii. p. 1052 ; Donnd. Zool. Beitr. iii. p. 51 ; 



Schreb. Nafurf. xviii. p. 182, pi. 4 ; Shaw, Zool. iii. p. 133; Schneid. 



Hist. Amjyh. p. 105, pi. 32 ; Leconte, Proc. Ac. Philad. 1855, 



p. 423. 



palustris, Gtienn, Icotioep'. Bept. pi. 26. f. 1. 



oxyi-hynchus, Salloxo. Proc. Ac. Philad. 1856, p. 142. 



Vomerine teeth in two scarcely oblique groups between the 

 choanfe. Head moderate ; snout rather pointed ; interorbital space 

 half as broad as the upper eyelid ; tympaniun distinct, nearly as 

 large as the eye. Fingers moderate, first extending beyond second ; 

 toes not quite webbed to the end ; subarticular tubercles of fingers 

 and toes well developed ; inner metatarsal tubercle very small, 

 blunt ; no outer one. The hind limb being carried forwards along 

 the body, the tibio-tarsal articulation reaches nearly the tip of the 

 snout. A prominent, narrow, glandular lateral fold. Olive or 

 greyish brown above, with regular oval or rounded dark-brown, 

 light^edged spots ; legs cross-barred ; beneath immaculate. Male 

 with two little-developed internal vocal sacs. 



Xorth and Central America. 



