466 BOULENGER. 



fold; inner metatarsal tubercle elliptic, prominent, f to f the length 

 of the inner toe; outer tubercle very small or absent. 



Skin of back smooth or rough with elongate warts, or with narrow 

 glandular folds; a rather broad glandular dorso-lateral fold from above 

 the tympanum to the groin; the distance between the folds, on the 

 back, i to T the length of head and body; sides somewhat corrugated 

 and pustular, or with elongate glandules. Lower parts smooth, or 

 posterior part of belly and thighs feebly granulate. 



Upper parts brownish olive, minutely and obsoletely mottled with 

 lighter, with numerous dark brown round blotches edged with yellow- 

 ish or with yellowish centers ; or pale yellow so thickly covered with 

 large reddish brown spots as to reduce the ground-color to a net- 

 work; glandular dorso-lateral folds yellowish; a white spot in the 

 center of the tympanum; hind limbs with dark cross-bands, the 

 interspaces between them sometimes very narrow. Lower parts 

 pale yellow or white. 



Male with external vocal sacs, forming loose folds above the arm; 

 fore limb moderately thickened; a moderately strong pad on the 

 inner side of the first finger. 



The above description of the typical R. areolata is taken from a large 

 male from Illinois, received from the Museum of Comparative Zoology, 

 and a half-grown individual from Hitchcock, Texas, received from the 

 American Museum; in its compilation I have also made use of the 

 works quoted in the synonymy, the excellent photographs in Miss 

 Dickerson's book having been particularly useful. 



Of the frog known as R. ccsopns, I have had a larger material and 

 also the privilege of seeing it alive. It differs in the rather larger head, 

 2i to 2f times in length to vent, always broader than long, the snout 

 sometimes not longer than the eye ; the tibio-tarsal articulation reaches 

 the tympanum or the eye, the tibia is 3 to 3^ times as long as broad 

 and up to 2\ times in length from snout to vent; the dorso-lateral 

 fold is usually very broad. 



Pale brown or gray above, the dorso-lateral folds pale yellow or 

 orange, speckled with blackish and with numerous round dark brown 

 or blackish spots on the head and body; tympanum reddish brown, 

 with a white central spot; limbs with dark cross-bands, which are 

 much narrower than the spaces between them. Lower parts white, 

 spotted or vermiculate with brown on the throat and breast. 



Nasal bones small and widely separated from each other and from 

 the frontoparietals, which leave the ethmoid uncovered in front; 

 zygomatic branch of squamosal long, extending to below the eye. 



