BIRDS OF NORTH AND MIDDLE AMERICA. 115 



[Thamnophilus] immaculalus Sclater and Salvin, Nom. Av. Neotr., 1873, 69^ 



part. 

 Myrmelastes immacula/us Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1892, 



225, part (Costa Rica and Panama localities and references). — Bangs, Proc. 



New Engl. Zool. Club, iii, 1902, 42 (Volcan de Chiriqui, 2,000 ft.). 

 [3£yrmelastes] immacidatus Sharps, Hand-list, iii, 1901, 32, part. 

 Myrmeciza immacidata Carriker, Ann. Carnegie Mus., vi, 1910, 618 (Caribbean 



slope Costa Rica, 1,000-4,000 ft.; crit.)o. 

 Myrmeciza zeledoni Ridgway, Proc. Biol. Soc. Wash., xxii, April 17, 1909, 74 



(Guayabo, Costa Rica; coll. U. S. Nat. Mus.). 



Genus FORMICARIUS Boddaert. 



Formicarius Boddaert, Tabl. PI. Enl., 1783, 43. (Type, F. cayancnsis Bod- 

 daert =i^. colma Boddaert.) 

 {!) Myrmecophaga Lacepede, Tableaux Oiseaux, 1799, 6. (Type undeterminable, 



no species being named; nomen nudum.) 

 Myolthera Spix, Av. Sp. Nov. Brazil, i, 1824, 72. (Type, M. rujiceps Spix= 



Turdus colma Gmclin. 

 Myothcra D'Orbigny and Lafresnaye, Mag. de Zool., 1839 (Synopsis Avium, 



p. 14). (Type, M. analis D'Orbigny and Lafresnaye.) 

 Myrmothcra, part, Vieillot, Analyse, 1816, 43, 70. (Type, none specified, and 



no species named; includes "Befroi, et quelques autres fourmilliers de 



Buffon"). 

 Myocincla Swainson, Classif. Birds, ii, 1837, 230. (Type, Turdus colma Gme- 



\i\\= Formicarius colma Boddaert.) 



Rather large Formic ariidse (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 antiae 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 antise 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 slight!}^ 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 



a Mr. Carriker erroneously concludes that because six skins of "Myrm,eciza 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. 



