BIRDS OF NORTH AND MIDDLE AMERICA. 123 



Eastern and northern Costa Rica (Talaraanca; Bonilla; Jimenez; 

 Rio Matina; Cuabre; Guacimo; Guapiles; La Vijagua; lia Florida; 

 Volcan de Miravalles; Pacuare; San Carlos) and Nicaragua (Mosquito 

 coast; Los Sabalos; Rio Escondido; San Emilis, Lake Nicaragua). 



Fonnicarius moniUger (not of Sclater, 1856) Sclater, Proc. Zool. Soc. Lond., 

 1858, 278, part (Mosquito coast, Nicaragua). 



Formicarivs hoffmanni (not Mynnornis hoffmanni Cabanis) Boucard, Proc. Zool. 

 Soc. Lond., 1878, 62 (San Carlos, Costa Rica; habits). — Zeledon, Proc. 

 U. S. Nat. Mus., viii, 1885, 108 (Costa Rica); Anal. Mus. Nac. Costa Rica, 

 1887, 115, part (Jimenez, Costa Rica). — S.'VLVin and Godman, Biol. Centr.- 

 Ani., Aves, ii, 1892, 2.34, part (Los Sabalos, Nicaragua; San Carlos, Jimenez, 

 and Pacuare, Costa Rica). — Richmond, Proc. U. S. Nat. Mus., xvi, 1893, 

 502 (Rio Escondido, Nicaragua; habits). 



Formicarius hoffmani Nutting, Proc. U. S. Nat. Mus., vi, 1883, 405 (Los Salxilos, 

 Nicaragua; habits; notes). 



[Formicarius] hoffmanni Sclater and Salvin, Nom. Av. Neotr., 1873, 75, part. 



Formicarius umbrosiis Ridgway, Proc. U. S. Nat. Mus., xvi, no. 961, Nov. 28, 

 1893, 681 (Talamanca, Costa Rica; coll. U. S. Nat. Mus.).— Underwood, 

 Ibis, 1896, 441 (Volcan de Miravalles, Costa Rica; habits; notes). — Gar- 

 riker, Ann. Carnegie Mus., vi, 1910, 624 (Caribbean and northern Pacific 

 lowlands of Costa Rica, up to 1,200 ft.; habits; descr. nest and eggs). 



[Formicarius] uvibrosus Siiahpe, Hand-list, iii, 1901, 39. 



FORMICARIUS MONILIGER HOFFMANNI (Cabanis.) 



HOFFMANN'S ANTTHRUSH. 



Similar to F. m. umhrosui^, but undei- tail-coverts clear tawny or 

 tawny-chestnut (as in F. m. jKinaniensis), and black of tlu-oat usually 

 more sharply defined and abruptly contrasted with the dark slate 

 color of chest. DifTermg from F. m. panamensis in larger size and 

 less brownish coloration.'^ 



Adult m«7.-.— Length (skins), L53-173 (163); wing, 90-98.5 (93.5); 

 tail, 51.5-56.5 (51.1); culmen, 19.5-23 (2L2); tarsus, 3L5-34 (33.5); 

 middle toe, 19-21.5 (20.4).^ 



.4(/(^/^ /ma?^'.— Length (skins), 155-170 (161); wing, 88-95 (91); 

 tail, 47-55 (51.1); culmen, 21-22.5 (21.7); tarsus, 31.5-34.5 (33.5); 

 middle toe, 19-20.5 (19.9).^ 



As in the young of F. in. uinhwsus, the young of this form fre- 

 quently bave the malar region, chin, and throat white barred or 

 transversely spotted with black. 



o As in F. m. panamensis, there is in this form sometimes a more or less distinct 

 indication of a chestnut or russet collar across the lower throat. Such specimens 

 may be easily distinguished from F. m. moniliger by the very different color of the 

 under tail-coverts (clear tawny or tawny-chestnut instead of light olive-brown and 

 dusky), and much lighter, as well as more extended, color (deep vinaceous-cinnamon 

 to cinnamon-rufous, instead of dull chestnut) of sides of neck and occiput and ter- 

 minal portion of auricular region. 



b Ten specimens, from Costa Rica. 



