KAJSID^E. CIX. 185 



b. Tympanum smaller than eye. 



c. Back with large distinct dark spots, more or less regularly arranged ; 



vomerine teeth between the inner nares. 



523. R. areolata Baird. The Northern form is var. circulosa 

 Rice & Davis, thus described : Brownish black, divided by narrow 

 clay-colored lines into irregular circular blotches, largest behind; 

 arms and legs barred or blotched; head broad depressed ; snout 

 very obtuse ; skin coarsely punctate ; a deep hollow between nostril 

 and eye ; region above and behind ear swollen ; glandular folds 

 large; toes narrowly webbed. L. 3; leg, 5. N. Ind. and 111. 

 The typical areolata, from Texas, has spots smaller, bordered with 

 white. (Lat., with little areas or spots.) 



524. R. virescens Kalm. COMMON FROG. LEOPARD FROG. 

 Green, usually bright, with irregular black blotches edged with 

 whitish, these mostly in two irregular rows on back ; usually two 

 spots between eyes ; legs barred above ; belly pale ; glandular folds 

 large ; head rather elongate. L. 2}. N. Am., W. to Sierra Ne- 

 vada, very common. (R. halecina "Kalm.") (Lat., greenish.) 



525. R. palustris Le Conte. PICKEREL FROG. Light brown, 

 with two rows of large oblong square blotches of dark brown on 

 back; one or two on sides; a brown spot above eye; a dark line 

 from nostril to eye ; upper jaw white, spotted with black ; head 

 short, obtuse ; toes well webbed ; glandular folds low. L. 2|> E. 

 U. S , in mountains, etc. (Lat., in swamps.) 



cc. Back with small dark spots or none. 



d. Side of head without distinct dark band; vomerine teeth between the 



inner nares. 



526. R. septentrionalis Baird. Brown or olive with paler 

 vermiculations ; sometimes a few dark blotches behind; pale below; 

 femur and tibia equal, ^ length of body. L. 2. Canada to Mon- 

 tana. (Lat, northern.) 



dd. Side of head with a dark brown band, wider behind, from snout to 

 near shoulder, bordered below by a yellowish white line ; usually 

 a black spot at base of arm ; vomerine teeth extending beyond level 

 of hinder edge of inner nostril. 



527. R. sylvatica Le Conte. WOOD-FROG. Pale reddish-brown ; 

 arms and legs barred above ; head small, pointed ; femur and tibia 

 about equal, the latter considerably more than half body ; a rounded 

 outer metatarsal tubercle present. L. If. E. U. S., W. to the 

 plains ; common in damp woods ; an almost silent frog. 



528. R. cantabrigensis Baird. Very similar to preceding, but 

 the tibia half length of body ; a narrow pale line along thighs be- 

 hind ; a dorsal line from snout to arms ; back sometimes with dark 

 spots ; no outer metatarsal tubercle. Mass., to Alaska and N. 

 (Lat., of Cambridge.) 



