188 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



shaped bill, definite though slight superior operculum to the rather 

 large and high nostrils; weak feet, slightly rounded tail, and rounded 

 wing (ninth primary intermediate between fourth and third). Except 

 in its very small size it comes rather near the aberrant species ( C. leu- 

 corha7nphm and G. chrysonotus) in structural details, but has the bill 

 more perfectly wedge-shaped, with the culmen quite straight, instead 

 of distinctly decurved terminally. 



Without better specimens of O. chrysonotus and C. alUrostris, how- 

 ever, I am not able to quite satisfy myself as to the proper limits of 

 the genus, and therefore for the present leave them as defined by 

 Dr. Sclater. 



KEY TO THE SPECIES OF CACICUS. 



a. Eump (also tail-coverts, base of tail, and patch on wing-coverts), yellow; culmen 



31.8 or more. (Colombia, including Isthmus of Panama. ) 



Cacicns vitelliniis (p. 188) 



aa. Rump orange-red or scarlet; culmen not more than 30.5. (Isthmus of Panama 



to Nicaragua. ) Caciciis microrhynohTis (p. 189) 



CACICUS VITELLINUS Lawrence. 

 LAWRENCE'S CACiaUE. 



Adult male. — General color uniform deep black, with a slight bluish 

 gloss in certain lights, the plumage of neck and body white at base 

 (concealed); lower back, rump, upper and under tail-coverts, and small 

 wedge-shaped patch on inner portion of wing, rich sa,ffron yellow vary- 

 ing to orange-yellow; basal portion of tail (mostly concealed by the 

 coverts) paler yellow, the shafts of middle rectrices, within the yellow 

 portion, nearly or quite white; innermost secondaries abruptlj' white 

 at concealed bases; bill pale grayish yellow or greenish yellow, some- 

 times darker (more olivaceous) basally; legs and feet black; length 

 (skins), 260.4-294.6(275.8); wing, 162.6-180.3 (172.2); tail, 106.7-117.5 

 (111.8); culmen, 36.5-10.6 (39.1); depth of bill at base, 15.7-17.5 (16.8); 

 width of culmen between loral antise, 7.9-9.7 (8.9); tarsus, 31-35.1 

 (32.8); middle toe, 21.6-25.4 (23.9).^ 



Adult female. — Similar to the male but decidedly smaller, and the 

 black duller, especially on the under parts where usually more or less 

 tinged with olive on abdomen and flanks; length (skins), 226.1-254 

 (234.2); wing, 130-136.7 (133.4); tail, 88.4-96.5 (92.2); culmen, 31.8- 

 33 (32.3); depth of bill at base, 13.5-15 (14.2); width of culmen between 

 loral antiEE. 7.4^7.9 (7.6); tarsus, 27.4-29.7(28.5); middle toe, 20.3-20.8 

 (20.3).^ 



Immiature male. — Similar in coloration to adult female, but larger. 



Northern Colombia (lower Magdalena Vallej'; Remedios, province 

 of Antioquia; Turbo; Rio Atrato, etc.), including Isthmus of Panama 

 (Lion Hill, Panama, etc.). 



' Five specimens. ''■ Six specimens. 



