36 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
bb. Pileum partly white. 
c. Pileum with more or less of white on basal portion of feathers. (Thamnophilus 
doliatus.) 
d. Darker, with white bars of upper parts narrower and black bars of under 
parts broader. 
e. Wing averaging longer (75.5 in adult male), tail relatively shorter (aver- 
aging 63 in adult male). (Guianas; Venezuela?). 
Thamnophilus doliatus doliatus, adult male (extralimital).® 
ee. Wing averaging shorter (72.6 in adult male), tail relatively longer (aver- 
aging 62.8 in adult male). (Atlantic slope of Mexico, except Yucatan 
and Campeche, and Central America.) 
Thamnophilus doliatus mexicanus, adult male (p. 40). 
dd. Paler, with white bars of upper parts broader and black bars of under parts 
narrower. 
e. Averaging smaller (wing averaging 70.1, tail 58.4), with black bars on 
under parts usually broader. (Pacific slope, from Chiapas to western 
Panama.)......--- Thamnophilus doliatus pacificus, adult male (p. 48). 
ee. Averaging larger (wing averaging 72, tail 63.2), with black bars on under 
parts usually narrower. (Yucatan and Campeche.) 
Thamnophilus doliatus yucatanensis, adult male (p. 44). 
ce. Pileum spotted or barred with white. (Eastern Panama and Colombia.) 
Thamnophilus multistriatus, adult male (p. 45). 
aa. Plumage largely rufescent (back, wings, etc., plain chestnut or tawny). 
b. Under parts dull slate-gray streaked with whitish. (Thamnophilus virgatus.) 
c. Wings and tail clearer chestnut-tawny (more rufescent); white streaks on 
pileum broader, those on under parts extended over greater part of abdomen. 
(Northwestern Colombia.)........- Thamnophilus virgatus virgatus (p. 46). 
cc. Wings and tail duller chestnut-tawny (more cinnamomeous); white streaks 
on pileum narrower, those on under parts also narrower and on abdomen 
confined to median line. (Central Colombia. ) 
Thamnophilus virgatus nigriceps (extralimital).¢ 
bb. Under parts buffy or tawny (with or without transverse bars). 
c. Under parts distinctly barred with blackish. 
Thamnophilus multistriatus, adult female (p. 45). 
cc. Under parts not distinctly if at all barred. 
Thamnophilus radiatus and subspecies, adult female.@ 
Thamnophilus doliatus and subspecies, adult female.@ 
@No females of this form have been examined by me. 
b[Lanius] doliatus Linneus, Syst. Nat., ed. 12, i, 1766, 138 (South America; based 
on Lanius cayanensis striatus Brisson, Orn., ii, 187; etc.).—Thamnophilus doliatus 
Vieillot, Nouv. Dict. d’Hist. Nat., iii, 1816, 315 (Cayenne); Sclater, Cat. Birds Brit. 
Mus., xv, 1890, 207, part.—L[anius] (ferrugineus) (not of Gmelin, 1788) Richard and 
Bernard, Actes de la Soc. d’Hist. Nat. Paris, i, pt. i, 1792, 116 (Cayenne).—Lanius 
(ferruginatus) Reich (G. C.), Mag. des Thierreichs, i, Abth. 3, 1795, 129 (emendation 
of L. ferrugineus Richard and Bernard).—Lanius rubiginosus Bechstein, Allgem. 
Ubers. de Vogel, i, 1793, 696 (new name for L. ferrugineus Richard and Bernard); 
Latham, Index Orn., Suppl., 1801, p. xix. 
¢ Thamnophilus nigriceps Sclater, Proc. Zool. Soc. Lond., 1868, 571 (Bogota, 
Colombia; coll. P. L. Sclater); Cat. Birds Brit. Mus., xv, 1890, 194, pl. 12. 
@ The differences between adult females of the several forms of these two species are 
not sufficiently definite to be intelligibly expressed in a key—at least not without 
expenditure of much more time than I am able to give the subject. 
