130 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



middle toe; hallux slightly shorter than lateral toes; basal ])lialanx 

 of middle toe adherent for slightly more than half its length to outer 

 toe, for very little less to inner toe; claws normal, though rather 

 slightly curved and blunt, that of the hallux much shorter than its 

 digit. 



Coloration. — Above slate color varied by a superciliary stripe and 

 spots on wing-coverts of ochraceous or tawny; under parts largely 

 ochraceous or tawny, the chest crossed by a band of black or dark 

 slate color; adult female much duller in color, with band on chest 

 obsolete (or brownish instead of black or slaty) and upper parts 

 brownish; 3"oung essentially like adult female but chest and breast 

 barred or squamated with grayish brown (no distinct streaks on 

 upper parts). 



Nidificaiion. — Nest placed in trees or bushes, bulky, open above, 

 composed externally of dry grass-stems, mosses, and lichens, slender 

 twigs, etc., lined with finer materials of similar character; eggs pale 

 greenish blue, rather sparingly speckled or spotted with brown. 



Range. — Northwestern North America. (Monotypic.) 



This very distinct genus is most nearly related to CicMoselys Bona- 

 parte "■ of northeastern Asia but is quite distinct, the latter having 

 the bill distinctly notched, the nostrils wholly" exposed, the middle 

 toe (without claw) nearly three-fourths as long as the tarsus, wing 

 and tail relatively longer (the former four times, the latter slightly 

 more than three times, as long as tarsus), and the ninth primary 

 equal to or longer than the seventh, instead of much shorter. The 

 two genera agree in the distinct '^pattern" or broad whitish band 

 across inner webs of remiges, the possession of a conspicuous super- 

 ciliary stripe^ (though this is indistinct in the female of CicMoselys) 

 and marked difference of coloration between the sexes; but while 

 the sexual difference of coloration in Ixoreus is manily one of degree 

 that in CicMoselys is distinctly one of kind, there being few other 

 members of the Turdidse in which the coloration of the sexes is so 

 radically different.^ 



oType, by elimination, Turdus sihhicus Pallas. (See Stejneger, Proc. U. S. Nat. 

 Mus., XV, 1892, 317, footnote. 



b This, however, is pure white in Cichlosclys in which the general eoloration is plain 

 blackish slate, approaching black on the head. (The female is plain olive-brown 

 above, beneath transversely spotted with olive-brown on a white and buffy ground.) 



cThe only case that I am, withoul lurthcr examination of specimens, able to recall 

 irf that of Grandala cxlicolor, in which the sexual difference in coloration i.s extreme. 



