BIKDS OF NORTH AND MIDDLE AMERICA. 325 



distinctly ridged, the mesorhinium strongly carinate; gonys about as 

 long as mandibular rami, distinctly convex, prominent basally, 

 strongly ascending terminally, broadly rounded (distinctly ridged or 

 carinate basally in adult males); lateral base of maxilla strongly 

 tumid or turgid, with nearly vertical or truncate basal outline; 

 maxillary tomium strongly incised or notched terminally, toothed 

 sub terminally; mandibular tomium rather shallowly incised termi- 

 nally, the tip of the maxilla produced laterally into a prominent vertical 

 tooth on each side, the two prongs inclosing the uncinate tip of the 

 maxilla. Nostril small, narrowly oval or elliptical, situated in a 

 narrow groove which widens anteriorly. Latero-frontal antise with 

 several elongated, slender, antrorse bristles; the rictus, malar apex, 

 and chin with similar bristles. Orbital region partly naked. Wing 

 short and rounded, very concave beneath, the longest primaries 

 exceeding secondaries by much less than length of culmen; fifth, 

 sixth, and seventh, or fourth to seventh, primaries longest, the eighth 

 shorter than third, ninth decidedly shorter than secondaries, the tenth 

 (outermost) a little more than half as long as ninth. Tail nearly to 

 quite three-fourths as long as wing, the lateral pair of rectrices about 

 two-thirds as long as middle pair. Tarsus more than twice as long 

 as distance from nostril to tip of maxilla, much longer than longest 

 toe with claw. 



Coloration. — Head, throat, and chest plain bright olive-tawny, the 

 capistrum dusky; above plain olive; under parts of body olive suf- 

 fused with light yellow, the sides of breast with a patch of light gray; 

 adult male with a nuchal tuft of elongated, narrow, glossy black 

 feathers. 



Range. — Highlands of Costa Eica and western Panama. (^lono- 

 typic.) 



DICRORHYNCHUS FRANTZn (Sclater). 



COSTA RICAN PRONG-BILLED BARBET. 



Adult maZe.— Forehead and crown bright golden yellowish brown 

 or tawny-orange; rest of pileum deep bright yellowish or brownish 

 olive, passing through brownish olive into dull olive-green on rump 

 and upper taU-coverts; tail duU olive; a conspicuous nuchal tuft of 

 elongated, flattened, glossy black feathers; anterior portion of 

 forehead (narrowly), lores, anterior portion of malar region, and 

 chin dull blackish or dusky; auricular and malar regions (except 

 anterior part of the latter), throat, and chest plain ochraceous-oHve 

 or olive-ochraceous; a patch of light bluish gray on each side of 

 breast, margined anteriorly by a more or less distinct bar of dusky; 

 median portion of breast (broadly) light olive, the feathers tipped 

 with golden ochraceous or dull saffron yellow; the abdomen similar 

 but more yellowish; rest of under parts light yellowish olive, suffused 



