BIRDS OF NORTH AND MIDDLE AMERICA. 37 
THAMNOPHILUS RADIATUS NIGRICRISTATUS (Lawrence). 
BLACK-CRESTED ANTSHRIKE. 
Similar to 7. doliatus and its subspecies? but adult males with 
elongated feathers of pileum entirely black. Still more like 7’. radiatus 
radiatus ® but coloration darker, in both sexes. 
Adult male —Pileum, except sides of occiput (supra-auricular region) 
and more or less of forehead, uniform black (without concealed white, 
except, sometimes, a very little on the occiput); rest of upper parts 
black barred, more or less broadly, with white, the white bars never 
as wide as the black interspaces, sometimes reduced to transverse 
spots; forehead usually more or less (sometimes extensively) streaked 
with white; sides of occiput (supra-auricular region), streaked with 
black and white, the black streaks usually broader than the white 
ones; auricular and malar regions and sides of neck similarly streaked, 
but the black streaks rather narrower; under parts white, the chin 
and throat usually streaked (sometimes broadly) with black, the 
remaining under parts (except, sometimes, abdomen) barred with 
black, the black bars usually much narrower than the white inter- 
spaces but sometimes nearly as broad, especially on flanks; maxilla 
blackish, paler on tomium; mandible grayish (sometimes whitish ter- 
minally and on tomium), bluish gray in life; iris straw color; legs and 
feet dusky (bluish gray in life?); length (skins), 138-158 (149); 
wing, 67.5-72 (70.2); tail, 54-61 (56.8); culmen, 17-19.5 (18.3); 
tarsus, 26-27.5 (26.7); middle toe, 14.5-17 (16.4). 
Adult female —Pileum deep chestnut, becoming paler (more tawny) 
on forehead; hindneck broadly streaked with black and ochraceous 
or tawny; wings and tail uniform deep cinnamon-rufous or chestnut- 
rufous, the back, scapulars, and rump similar but usually lighter 
and more tawny-rufous; sides of head (including supra-auricular 
region) buffy whitish, buffy, ochraceous, or pale tawny, streaked 
(except on lores) with black, the black streaks broader on supra- 
auricular region, narrower (sometimes nearly obsolete) on anterior 
portion of malar region; chin and throat immaculate, very pale buffy 
«The individual variation in this form seems to include as great extremes of 
coloration, as regards relative width of black and white bars in the adult male 
and intensity of coloration in the female, as is covered by the geographic variations in 
T. doliatus! 
b Thamnophilus radiatus Vieillot, Nouv. Dict. d’Hist. Nat., iii, 1816, 315; Sclater, 
Cat. Birds Brit. Mus., xv, 1890, 210. Several subspecies have been described, but 
I have not been able to secure sufficient material to enable me to characterize 
them satisfactorily. They are involved in much confusion and require careful 
revision. 
e¢W. W. Brown, jr., on label. 
¢ Thirteen specimens from Panama (mainland). 
