440 U.S. NATIONAL MUSEUM BULLETIN 288 



shoulder; a weak skinfold across chest; no ventral disk; a U-shaped 

 median external vocal sac in the male. 



Dimensions. — Head and body, 25.5 mm.; head length, 9 mm.; 

 head width, 9 mm.; femur, 10.5 mm.; tibia, 11 mm.; foot, 8.5 mm.; 

 hand, 5 mm. 



Color in alcohol. — Dorsum drab, with a seal brown crossbar between 

 the eyes that is bordered anteriorly with a narrow light line; snout 

 in front of this line pale drab gray, with a small brown spot on canthus 

 and one in center of snout; a few similar spots on midline of back 

 and above shoulders; throat and belly light drab, the throat nearly 

 immaculate except for a small brown spot below commissure of jaw 

 and another in front of shoulder, the chest and belly with a fairly 

 heavy sprinkling of brown spots; legs, including posterior femur, fawn 

 color above and below; upper surfaces of arms with scattered brown 

 dots; side of head drab, immaculate except for the brown can thai 

 spot already noted and two or three faint dark stripes from below 

 eye to edge of upper lip; soles of feet and palms of hands ecru drab, 

 the disks above seal brown. 



Remarks. — The adpressed heel usually reaches to the center of the 

 eye, but sometimes to its anterior or posterior border. The toes have 

 scarcely perceptible traces of a web in most of the specimens; in the 

 remainder a definite trace occurs, occupying up to one-eighth the 

 length of the fourth toe. Dark spots like those in the described speci- 

 men occur on the bellies of three other frogs in the small series of 

 Choc6 frogs, but the majority have immaculate bellies. In CNHM 

 81841-5 from Andagoya, the bellies are slightly granular. 



While Cope's type of diastema is still in the U.S. National Museum, 

 it is too old and soft to be of much value for comparison with Colom- 

 bian specimens. Taylor (1952, p. 701) states definitely that diastema, 

 ranging from Nicaragua to Panama, has the fingers and toes "without 

 the trace of a web." The Choc6 frogs, some with a distinct small web 

 between the toes, are only tentatively assigned to this species. 



The Choc<5 specimens are quite distinct from Boulenger's gularis, 

 known from Gorgona Island, and Valle. In that species the outline 

 of the snout is less slender and the foot is shorter. An interesting fact 

 drawn from analysis of the critical measurements is that the hand 

 length, usually the least variable of such measurements, is the most 

 variable proportionately in both gularis and these Choc6 specimens 

 tentatively assigned to diastema. 



Specimens Examined 

 COLOMBIA ^ 



Choc6: Andagoya, CNHM 81841-5, USNM 144780; Boca de la Raspadura, 



AMNH 13684; Las Animas Creek, Quito River, tributary of the Atrato, 



AMNH 13613; Pizarro, CNHM 43993-4, USNM 147232 (formerly CNHM 



43992) . All are tentatively assigned to E. diastema. 



