BIRDS OF NORTH AND MIDDLE AMERICA. 105 
bright cinnamon-rufous, more grayish (sometimes wholly gray) on 
pileum and hindneck, the wing-coverts sometimes spotted with black; 
sides of head, throat, and chest black, rest of under parts white 
medially, grayish and fulvescent laterally; adult females similar but 
without black on under parts. 
Range.—Nicaragua to western Ecuadér, Amazon Valley, and 
British Guiana. (About six species.)? E 
KEY TO THE SPECIES OF MYRMECIZA. 
a. Under parts partly black. 
b. Back, wings, etc., brown or cinnamon-rufous. 
c. Abdomen white; back, wings, etc., cinnamon-rufous or rufous-chestnut. 
(Myrmeciza boucardi.) 
d. Whole chest gray. 
e. Pileum and hindneck wholly gray; no black spots or bars on wing-coverts. 
(Central Colombia.) 
Myrmeciza boucardi boucardi, adult male (extralimital).> 
ee. Pileum and hindneck mostly rufous-brown; wing-coverts with con- 
spicuous bars or transverse spots of black. (Central Venezuela.) 
Myrmeciza boucardi griseipectus, adult male (extralimital).¢ 
dd. Upper chest black, like throat, the lower chest white medially. 
ee. Sides of chest paler and less extensively gray. (Coast district of Vene- 
zuela; Triniddéd.) 
Myrmeciza boucardi swainsoni, adult male (extralimital).¢@ 
ee. Sides of chest darker and more extensively gray. (Eastern Panam4 and 
Caribbean coast district of Colombia.) 
Myrmeciza boucardi panamensis, adult male (p. 107). 
aT have not seen Thamnophilus leuconotus Spix, referred to Myrmelastes by recent 
authors. 
I am quite unable to appreciate any reasons for retaining a genus Myrmelastes as 
distinguished from Myrmeciza, unless the former is restricted to the type (MM. plum- 
beus). The latter differs from other species in much greater development of the 
plumage of the lower back and rump, stouter bill, more rounded wing, and narrower, 
more broadly operculate nostrils. On the other hand, M. boucardi and its allies 
have a longer and more slender bill, longer tail, with relatively narrower rectrices, 
longer outermost primary, and very different style of coloration. While not so 
homogeneous as most genera, however, the group, after the elimination of the long- 
tailed and otherwise very different species constituting the genus Drymophila Swain- 
son (see page 15), may, on the whole, be considered a fairly natural group. 
b Myrmeciza boucardi Berlepsch, Ibis, 5th ser., vi, no. xxi, Jan., 1888, 129 (Bogota, 
Colombia; coll. Count von Berlepsch); Sclater, Cat. Birds Brit. Mus., xv, 1890, 279, 
part (Bogoté).—[Drymophila] boucardi Sharpe, Hand-list, iii, 1901, 34. 
¢ Myrmeciza swainsoni grisetpectus Berlepsch and Hartert, Novit. Zool., ix, no. 1, 
April 10, 1902, 76 (Caicar4, Orinoco R., Venezuela; coll. Tring Mus.). 
@ Myrmeciza swainsoni Berlepsch, Ibis, 5th ser., vi, no. xxi, Jan., 1888, 130, in text 
(based on Myrmothera longipes Swainson, but not of Vieillot).— M[yrmeciza] boucardi 
swainsonit Ridgway, Proc. Biol. Soc. Wash., xxi, Oct. 20, 1908, 194, in text.— Myrme- 
ciza longipes albiventris Chapman, Auk, x, no. 4, Oct., 1893, 343; Bull. Am. Mus. 
N. H., vi, Feb., 1894, 51 (Princestown, Trinid4d; coll. Am. Mus. N. H.).—[Drymo- 
phila] albiventris Sharpe, Hand-list, iii, 1901, 34 (Trinid4d)—Myrmeciza longipes 
longipes (not Myrmothera longipes Swainson?) Hellmayr, Novit. Zool., xiii, 1906, 33 
(Trinidéd; crit.). 
