676 THE GENUS FORMJCARIUS RIDGWAY. 



ley") is most like the female from Costa Eica but is eveu less castaiieous 

 or rafescent al)ove''(iiear]y pure "bister" on the back) and more exten- 

 sively slaty beneath, while the hind neck, instead of being- similar in 

 color to the back (as in both Costa E-ica specimens), is dark slate color, 

 like the chest, and the under tail coverts bright rufous-tawn5^ It very 

 likely represents a local race. Its measurements are as follows: Total 

 length (skin), 7.00 5 wing, 3.70; tail, 2.28; exposed culmen, 0.80; tarsus, 

 1.30; middle toe, 0.80. 



This species undoubtedly comes nearest to F. analls (Lafr.), which re- 

 places it in Bolivia and eastern Peru (and eastern Ecuador?), but maybe 

 easily recognized by its perfectly black pileum (the whole top of tlie head 

 in F. amdis being. olive-brownish, like the back), darker under tail cov- 

 erts with tlieir longer feathers chieHy dusky, and decidedly largcrTsize, 

 the bill especially. From the other two species found in Costa Rica it 

 may at once be distinguished, in addition to its black jnleum, by the 

 entire absence of any cinnamomeous coloring about the head or neck, 

 and by the absence of any trace of Avhite on the lores. 



5. Forniicarins crissalis (Ciibaiiis). 



Myiothera auaJis (ncv l.Aint) Caij. in Sdliomb. (Juiaiia,, iii, 1848, 686 (Roraiuia, Br. 

 Guiana). 

 Formicariits aiudix Sol. P. Z. S. 1858, 277, part (Caymme; ]5rit. Guiaua; Para?). 

 Alyrmornis rJv'^sa/J.vCAii. J. f. O. 1861, 96 (Rorainia). 

 Formicarius crissalits ScL. and Salv. P. Z. S. 1867,576 (Para). — Salv. P. Z. 8. 1866, 

 75, part* (Guiana; Cayenne; Para). — ScL. Cat. B. Brit, Mus. xv. 1890, 305, part 

 (Cayenne; Guiana).— Salv. and Godm. Biol. Centr.-Am., Aves, ii, pt. 30,1892, 

 234, in text (Guiana). 

 Forviicarhis hoffmanni (noc Cais.) Sai.v. Ibis, 1885, 129 (Caniacusa, l>r. Guiaua). 



Sp. Char. — Similar to F. diiaJis (Lair.), bnt ])ost(r(*ular legion an<l 

 sides of neck distinctly cinnamomeous. in marked contrast with color 

 of hind neclv. 



Adult male (coll. tSalvin and Godman, Cariniang Eiver, British Chiiana, 

 December 7, 1885, If. Whitely).— Feathers of i)ileum blackish, broadly 

 margined with bistei- brown, ])roducing a distinctly scaled appearance; 

 rest ol" u[)per parts bright bister bro^\ n, de<'i)er, warmer, brown on wing 

 coverts and secondaries, brigliter on u|)])er tail coverts. Tail warm bister 

 brown, with exposed terminal half blackish. Postocular region (sides 

 of occiput and terminal poition of ear c<>verts) and sides of neck.vina- 

 ceousbrown (intennediate between Mars brown and fawn coloi) ; lores, 

 margin of orbital region (except posteriorly) cheeks, chin, and throat, 

 deep black, the first with a large central spot of white. Chest dull 

 slate-gray, clanging to i)aler gray on si<les and Hanks (which aretinged 

 with olive on outermost leathers), and lightening into i)ale gray on lower 

 breast sind belly, the lower portion of the latter <|nite Avhite; under tail 

 coverts clear bright tawny. l>ill black; legs and feet horn brownish. 

 Total length (skin), (».7.'>; wing, 3.(K); tail 2.10; exposed culmen, 0.72; 

 tarsus, 1.30; middle toe, 0.80. 



*Not tlio description, wliicli is ciiMn-ly that of F. sainratna Ridgw. 



