458 U.S. NATIONAL MUSEUM BULLETIN 288 



from posterior comer of eye to sacrum, and a lateral line from above 

 shoulder to groin; a heavy glandular ridge from posterior corner of eye 

 above tympanum, ending above shoulder; a skinfold across chest; a 

 ventral disk; no external vocal sac; arms strongly developed and two 

 heavy black horny excrescences on the chest (in male) . 



Dimensions. — Head and body, 82 mm.; head length, 29 mm.; 

 head width, 30.5 mm.; femur, 38.5 mm.; tibia, 42.5 mm.; foot, 40.5 

 mm. ; hand, 23 mm. 



Color in alcohol. — Dorsum burnt umber, lightening to drab posteriorly 

 and on legs; a triangular sepia interocular patch, its apex directed 

 backwards; a clove brown line beginning at tip of snout, continuing 

 along loreal region and paralleling the dorsolateral lines; a similar 

 dark line on supratympanic ridge; sides of body drab with many 

 small irregular sepia spots behind arm insertion; three or four wide 

 dark crossbars alternating with narrow ones on top of femur, con- 

 tinuing on posterior femur as a dark reticulation with many scattered 

 light spots; upper tibia with olive crossbars that become darker and 

 larger on concealed surface of tibia; foot drab with small darker spots; 

 upper arm drab with two or three large irregular dark spots between 

 elbow and axilla; side of head tawny olive, with a narrow dark line 

 bordering the mouth; venter wood brown anteriorly to ecru drab 

 posteriorly; edges of lower jaw with small scattered russet spots, 

 and some much paler spots on belly and lower leg surfaces; soles of 

 feet and palms of hands mottled buff pink and pale drab; thumb spine 

 of male black. 



Remarks. — Comparing the graph of Leptodacylus ocellatus (in 

 Cochran, 1955, p. 384) based on 168 specimens, mostly Brazilian, with 

 measurements of 55 Colombian specimens of L. insularum, the tibia 

 and hand are found to be significantly longer proportionately in the 

 latter: 



L. ocellatus L. insularum 



Specimens at hand of insularum from Old Providence Island tend to 

 have a slightly wider head and a longer femur than those from the 

 mainland, although in the graphs made from these critical measure- 

 ments the areas of significant variation (that is, twice the standard 

 error from the mean) are separated by only 0.1 percent in head width 

 and exactly adjoin in femoral length. A much larger series of frogs 

 from Old Providence Island is needed before the significance of these 

 slight differences can become apparent. The tarsus is completely 



