BIEDS OF NORTH AND MIDDLE AMERICA. 183 



Cassicus gi(nii)ii()zinus CasvSin, Pror. Ac. Nat. Sci. Phila., 1867, 71, part (Turbo, n. 

 Colombia). 



Gymnostinojis guatbnozhms Sclater, Cat. Birds Brit. Mus., xi, 1886, 314 (Reme- 

 (lios). — Salvin and Godmax, fiiol. Centr.-Am., Aves, i, 1886, 439, pi. 32. — 

 RoBiNsox, Flying Trip to Tropics, 1895, 160 ( lower Magdalena R. , Colombia). 



Genus OSTINOPS Cabanis. 



Ostinopii^ Cabanis, Mus. Hein., i, Sept., 1851, 187. (Type, Oriolus cristatus 

 Gmelin, =Xnnthornus decumanns Pallas. ) 



VeiT larg-e arboreal Icteridiv with bill long-ei than head, straight, 

 acute elongate-conical, with l)asal outline of mandibular rami nearly 

 vertical, truncate, the basal portion of culmen elevated and expanded, 

 forming a narrow but prominent frontal .shield; head completelj^ 

 feathered. 



Bill slightly longer than head, elongate-conical, acute, compressed, 

 with nearlv straight outlines, its basal depth decidedly less than dis- 

 tance from nostril to tip of maxilla, its basal width nearly half that 

 measurement; culmen straight, slightly decurved terminallj^, the basal 

 portion, slightly elevated, arched, and expanded, forming a narrow 

 frontal shield, the rounded posterior extremity of which is about on 

 line with anterior angle of eye; gonvs straight, decidedly more than 

 half as long as cuhnen but shorter than distance from nostril to tip of 

 maxilla; commissure straight to behind nostril, where decidedly 

 dellexed to the rictus; mandibular rami posteriorly widened and 

 truncate, but not swollen. Nostril miu-h below lateral median line of 

 maxilla, small, broadly oval or nearly circular, ])ored directly into the 

 horny rhinotheca, slightl}^ beveled anteriorly, posteriorly touching 

 the loral feathering. AVing long (more than four times as long as 

 culmen), the tip long (nmch longer than culmen) and wedge-shaped; 

 ninth (outermost) primarv intermediate between fifth and fourth; 

 seventh or sixth primary longest; four outer primaries gradually con- 

 tracted terminally and pointed, their inner web faintly sintiated. 

 Tail between three-fourths and four-fifths as long as wing, graduated, 

 with middle pair of rectrices shorter than third pair and dift'erently 

 colored from the others, the rectrices rather narrow but not contracted 

 terminally. Tarsus longer than maxilla from nostril, very stout, its 

 anterior scutella very distinct; middle toe, with claw, decidedly 

 shorter than tarsus (about equal to maxilla from nostril); outer toe 

 with claw reaching slightl}" beyond base of middle claw, the inner 

 slightly shorter; hallux nearly as long as inner toe, much stouter, its 

 claw decidedly shorter than the digit. Head completely feathered, a 

 sparse crest of narrow elongated feathers springing from middle of 

 crown. 



(Joloratton. — Black and chestnut, or olive-green, olive-brown, or 

 russet, with the tail mostly yellow . 



^''osrzj'oc?, knochern, und o3^, WTto6, rj Gesicht, Autlitz." 



