654 BULLETIN 50, UNITED STATES NATIONAL MUSEUM, 



Bill about as long as head or slightly shorter, stout, but variable 

 in relative width and depth, its width at anterior end of nostrils some- 

 times (in M. hairdi) less than half the distance from nostril to tip of 

 maxilla and equal to its depth at same point; sometimes (in M. 

 clirysocephalus and M. hemickrysus) its width at anterior end of nostrils 

 equal to much more than twice the distance mentioned, and conspicu- 

 ously greater than its depth at same point; its lateral outlines 

 straight {M. hairdi, M. luteiventris) or strongly convex subterminally, 

 the tip of maxilla rather abruptly contracted; exposed culmen about 

 as long as tarsus (sometimes decidedly less, more rarely decidedly 

 more), distinctly ridged, straight or very nearly so for most of its 

 length, strongly (sometimes abruptly) decurved terminally, the tip 

 of maxilla more or less strongly uncinate; gonys decidedly longer 

 than mandibular rami (but less than twice as long), straight or very 

 slightly convex; mandiV)ular tomium straight or sometimes slightly 

 convex anteriorly, distinctly notched subterminally. Nostril more 

 or less exposed, nearly circular ( ilf. lairdi, M. lute/wentris) , obliquely 

 oval (J/, solitarius, M. maculatus) or longitudinally oval (M. cliryso- 

 cephalus, M. hemichrysus) . Rictal bristles strong, the feathers of 

 chin, malar antiie, and frontal antiiie with distinct bristh" tips, the last 

 arching over nostrils. Wing rather long, pointed, the longest pri- 

 maries exceeding distal secondaries by much more than length of 

 tarsus; seventh, eighth, seventh and eighth, or eighth and ninth pri- 

 maries longest, the tenth (outermost) slightly shorter than fourth to 

 nearly as long as sixth. Tail three-fourths to five-sixths as long as 

 wing (longer than distance from bend of wing to end of distal seconda- 

 ries), even, slightly rounded, slightly double-rounded, or slightl}' emar- 

 ginate, the rectrices of even width and with broadly rounded tip. 

 Tarsus equal to or barely longer than middle toe with claw (decidedly 

 longer in M. hairdi), sometimes very slightly shorter, its scutellation 

 typicall}?^ exaspidean, without separate series of scutella on upper 

 posterior portion of outer side of tarsus, the acrotarsial divisions 

 distinct; basal phalanx of middle toe united for greater part of its 

 length to outer toe, for half its length, or less, to inner toe; outer 

 toe, without claw, reaching to or beyond middle of subterminal 

 phalanx of middle toe, the inner toe more or less distinctly shorter; 

 hallux about as long as inner toe, not conspicuously stouter, its claw 

 shorter than the digit; all the claws rather large, moderatel}'^ curved, 

 moderately sharp and compressed. 



Coloration. — (1) Conspicuously streaked, above and below, the 

 upper tail-coverts and tail mostly rufous or broadly edged with 

 rufous. (2) Plain brown above, the upper tail-coverts and tail and 

 outer webs of remiges mostly rufous ; under parts plain straw yellow, 

 passing into grayish on throat. (3) Plain olive above, the upper 

 tail-coverts, rectrices, and remiges mereh^ margined with rufous; 

 under parts sulphur yellow, passing into brownish or buffy white on 



