BIRDS OF NORTH AND MIDDLE AMERICA. 115 
[Thamnophilus] immaculatus SctatrR and Sarvin, Nom. Av. Neotr., 1873, 69, 
part. 
Myrmelastes immaculatus Satvin and Gopman, Biol. Centr.-Am., Aves, ii, 1892, 
225, part (Costa Rica and Panama, localities and references)—Banas, Proc. 
New Engl. Zool. Club, iii, 1902, 42 (Volcan de Chiriqui, 2,000 ft.). 
[Myrmelastes] immaculatus SHARPE, Hand-list, iii, 1901, 32, part. 
Myrmeciza immaculata CaRRIKER, Ann. Carnegie Mus., vi, 1910, 618 (Caribbean 
slope Costa Rica, 1,000-4,000 ft.; crit.) ¢. 
Myrmeciza zeledoni Ripeway, Proc. Biol. Soc. Wash., xxii, April 17, 1909, 74 
(Guayabo, Costa Rica; coll. U. 8. Nat. Mus.). 
Genus FORMICARIUS Boddaert. 
Formicarius Bopparrt, Tabl. Pl. Enl., 1783, 43. (Type, F. cayanensis Bod- 
daert=F. colma Boddaert.) 
(?) Myrmecophaga LactrEpe, Tableaux Oiseaux, 1799, 6. (Type undeterminable, 
no species being named; nomen nudum.) 
Myotthera Spix, Av. Sp. Nov. Brazil, i, 1824, 72. (Type, M. ruficeps Spix= 
Turdus colma Gmelin. 
Myothera D’OrBicNy and LaFRESNAYE, Mag. de Zool., 1839 (Synopsis Avium, 
p. 14). (Type, UM. analis D’Orbigny and Lafresnaye.) 
Myrmothera, part, Vre1ttot, Analyse, 1816, 43, 70. (Type, none specified, and 
no species named; includes ‘‘Befroi, et quelques autres fourmilliers de 
Buffon’). 
Myocincla Swanson, Classif. Birds, ii, 1837, 230. (Type, Turdus colma Gme- 
lin=Formicarius colma Boddaert.) 
Rather large Formicariide (length about 150-180 mm.) with very 
dense, compact plumage; bill much shorter than head, depressed 
basally; short, rounded tail (less than two-thirds as long as the short 
and concave, rather pointed wing); latero-frontal antiz with feather- 
ing short and dense; scutellate tarsi, short anterior claws, and plain 
coloration. 
Bill shorter than head (exposed culmen about as long as distance 
from nostril to posterior angle of eye), with straight lateral outlines, 
slightly depressed basally, its width at latero-frontal antie greater 
than its depth at same point and equal to half the distance from 
nostril to tip of maxilla, or slightly less; culmen distinctly ridged, 
straight or nearly so for most of its length, decurved terminally, the 
tip of maxilla inconspicuously and rather obtusely uncinate; max- 
illary tomium slightly convex posteriorly, straight anteriorly, slightly 
notched subterminally; mandibular tomium faintly concave pos- 
teriorly, nearly straight or very faintly convex anteriorly, very 
indistinctly notched subterminally; gonys decidedly to rather 
@ Mr. Carriker erroneously concludes that because six skins of ‘ Myrmeciza immacu- 
lata (Lafresnaye)’’ from western Colombia agree closely with Costa Rican specimens 
of M. zeledoni, the latter is not a tenable form. He quite overlooked the fact 
that the specimens from western Colombia which he examined are not Thamno- 
philus immaculatus of Lafresnaye, which is so different that their confusion would 
be almost impossible if specimens are actually compared. His observations simply 
extend the range of M. zeledoni to western Colombia. 
