402 bulletin: museum of comparative zoology. 



FF. Greyish above, no spots on sides, generally a longitudinal 



stripe on each side infraguttatus Boulenger. 



CC. No dark bar or spots on chest. 



D. Ground-tone of ventral surface uniform blackish. 



mekmorhinus Berthold. 

 DD. Ground-tone of ventral surface greyish or whitish. 

 E. TjTnpanum concealed, throat greyish, belly white. 



irilineatus Boulenger. 

 EE. Tjonpanum not concealed. 



F. Tj-mpanum two thirds diameter of eye. 

 G. Two white lines on each side of head. 



bolwianus (Boulenger). 



GG. No white lines on head whijmperi (Boulenger). 



FF. Tympanum about lialf the diameter of eye, or less, sometimes 



indistinct. 



G. First finger longer than second; tympanum hidden or 



about one third diameter of eye. . . . boulenger i (Barbour). 



GG. First two fingers of equal length; tympanum about half 



as broad as eye subpundatv^ (Cope). 



One species, generally referred to Phyllobates, differs radically 

 from all the species of that genus and must be considered generically 

 distinct. We propose for it the name : 



Sminthillus, gen. nov. 



Type. Sminthillus limbatus (Cope). 



Diagnosis. Habit of Phyllobates but no pair of dermal scales on 

 the upper surface of the digital discs; coracoids narrow (Fig. 2); 



Fig. 2. — Sminthillus limbatus (Cope). Shoulder-girdle, x 27. 



precoracoid cartilages very broad, merging gradually into the broad 

 ^picoracoid cartilage; omostemum cartilaginous, without a bony 



