12 U.S. NATIONAL MUSEUM BULLETIN 288 



between nostrils. Tympanum not distinct. Fingers very long and 

 slender, without lateral ridges, free, increasing in length in the order 

 1-4-2-3, each finger with a tactile 4-pointed "star" at its tip; no 

 thumb pad, palmar callus, or metacarpal tubercles. Toes long, fully 

 webbed, third and fifth toes subequal, the second a little longer than 

 fourth; a sharp, triangular inner metatarsal tubercle, but no outer 

 one, no tarsal ridge; a slight skinfold on heel and knee. Body very 

 stout and flat, in postaxillary region equal to greatest width of head. 

 When hind leg is adpressed, heel reaches axilla; when limbs are laid 

 along the sides, knee and elbow are slightly separated; when hind 

 legs are bent at right angles to body, heels are well separated, Skin of 

 upper parts roughened by small spiny tubercles beginning behind 

 head and enlarging posteriorly; a large fringed skinflap at angle of 

 jaw, and a semicircular one above anus; a small tentacle at each 

 nostril, and other tentacles nearly encircling eye; venter finely 

 tubercular, with many short transverse wrinkles on belly; a narrow 

 glandular ridge from eye to corner of mouth; four longitudinal ridges 

 on back and dorsolateral region; no skinfold across chest; no ventral 

 disk; no vocal sacs in the male. 



Dimensions. — USNM 57571, a female from British Guiana: head 

 and body, 134 mm.; head length from angle of jaw, 40 mm.; head 

 width, 54 mm.; femur, 58.5 mm.; tibia, 53.5 mm.; foot, 50 mm.; 

 hand, 35 mm. 



Color in alcohol. — Above dull olive, immaculate; sides and venter 

 with dirty whitish spots. A young specimen (USNM 142178) from 

 Rio Urubu near Itacoatiari, Brazil, is ochraceous above and below, 

 with small sepia spots along the dorsal ridges and scattered over 

 venter, with a transverse sepia line across the throat and a wider 

 midventral stripe from throat to anus. 



Remarks. — While Leticia, in Amazonas, is at present the only 

 known Colombian locality for Pipa pipa, it seems likely that the 

 species also will be found in headwaters of other affluents of the 

 Amazon River system. 



Specimens Examined 



COLOMBIA 



Amazonas: Leticia, MLS 810. 

 BRAZIL: Rio Urubu, near Itacoatiari, USNM 142178. 

 BRITISH GUIANA: USNM 57571. 



SUBORDER DIPLASIOCOELA 



Shoulder girdle usually firmisternal. Epicoracoids sometimes more 

 or less separated, but never produced into posteriorly directed epi- 

 coracoid horns. Vertebral column either diplasiocoelous or uniformly 



