BIRDS OF NORTH AND MIDDLE AMERICA. 53 



to rather strongly uncinate; maxillary tomiiim straio-ht, distinctly 

 notched subterminally ; mandibular tomium nearly straight, minutely 

 toothed and notched subterminally, the tip of mandible forming a short 

 recurved point; gonys gently convex, slightly ascending terminally, 

 not prominent basally. Nostril exposed, posteriorly in contact with 

 feathering of latero-frontal antia?, roundish or broadly oval, its upper- 

 posterior margin membraneous, the interior tubercle visible within 

 posterior portion. Rictal bristles present but minute, the feathers of 

 chin, anterior portion of malar region, and lores with long terminal 

 setse. Wing moderate, with longest primaries extending to decidedly 

 beyond secondaries; sixth and seventh, or fourth, fifth and second, 

 primaries longest, the tenth (outermost) less than three-fifths but 

 more than half as long as the longest, the ninth about equal to or 

 slightly shorter than secondaries. Tail a little more than half to 

 more than two-thirds as long as wing, slightly rounded or nearly 

 even, the rectrices (12) narrow, subrounded or subacuminate ter- 

 minally. Tarsus much longer than exposed cuhnen, about one- third 

 as long as wing, slender, the acrotarsium distinctly scutellate, the 

 plantar scutella in two longitudinal series, less distinct on outer side; 

 middle toe, with claw, much shorter than tarsus; outer toe, without 

 claw, reaching to slightly beyond middle of subterminal phalanx of 

 middle toe, the inner toe a little shorter; hallux about as long as 

 inner toe, but much stouter; basal phalanx of middle toe wholly 

 united to outer toe, for about half its length to inner toe; claws 

 moderate in size and curvature, that of the hallux decidedly shorter 

 than the digit. Plumage full, soft, and blended, longer and more 

 lax on rump; pileum not crested. 



Coloration. — Adult males olive or olive-greenish above, the head 

 and neck gray or slate-colored (sometimes streaked or spotted with 

 blackish), the lesser wing-coverts black, spotted with white or with a 

 white area on inner-anterior portion; under parts mostly whitish or 

 yellowish (at least medially), the throat and chest sometimes streaked 

 with gray or blackish. Adult females duller in color, with pileum 

 rufescent. 



Range. — Guatemala to British Guiana, southeastern Brazil, Para- 

 guay, Bolivia, and Peru. (About ten species.)'^ 



ol have not seen D. guttulatus (Lichtenstein), D. tambillanus Taczanowski, D. 

 xanthopterus Burmeister, nor D. Jlemingi Hartert. All these except D. xanthopterus 

 appear, however, to be congeneric with D. mentalis, etc., so far as I am able to judge 

 from descriptions; but the style of coloration is so different in D. xanthopterus (chest- 

 nut-rufous wings and lower back, white spots on sides of head, etc.) that I doubt its 

 close relationship. 



D. Icucostictus Sclater, D. schistaceus (D'Orbigny), D. ardesiaciis Sclater and Salvin, 

 D. unicolor Sclater, and D. subplumbeus Sclater and Salvin, I unhesitatingly exclude, 

 as being much more nearly related to the genus Erionotus Cabanis and Heine (= Thain- 

 nophilus, part, of Sclater). 



D. plumbeus (Maximilian) I have seen but have not now at hand, and therefore 

 can not verify my impression that it is congeneric with D. mentalis and allies. 



