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 * cc. Interorbital septum wanting; postorbital process wanting; maxillo-palatine long, narrow, angulated, continued backward to the level of the median descending plate of the palatine; intrinsic muscles wanting; sternotrachealis not attached to processus vocales; palate schizognathous; mesorhinium normal; nostrils not conspicuously operculate; tarsal envelope exaspidean

Conopophagidæ (extralimital).
 * bb. Metasternum 2-notched; tensor patagii brevis tendon normally passerine.

Formicariidæ (p. 8). aa. Two pairs of tracheo-bronchial muscles; metasternum 2-notched; tarsal envelope endaspidean.
 * b. Nares schizorhinal; maxillo-palatines long and slender, continued backward to or beyond level of the free end of the median descending plate of the palatine; interorbital septum perforate; palate schizognathous; outer toe decidedly (usually much) shorter than middle toe and not conspicuously longer than inner toe (except in Sclerurus and Pygarrhicus) and united to middle toe for not more (usually less) than whole length of basal phalanx of the latter; hallux (without claw) as long as inner toe (without claw) or longer, much stouter.

Fumariidæ (p. 157).
 * bb. Nares holorhinal; maxillo-palatines short and broad, crossing posterior end of olfactory fossa and terminating immediately in front of the descending plate of the palatine; interorbital septum imperforate; palate ægithognathous or semi-desmognathous; outer toe as long as middle toe, much longer than inner toe, united to middle toe for more than whole length of basal phalanx of the latter; hallux (without claw) shorter than inner toe (without claw), little, if any, stouter.

Dendrocolaptidæ (p. 224).

 Family PTEROPTOCHIDÆ. THE TAPACULOS.


 * = Rhinomydææ Voy. Am. Mérid., iv, part 3, 1839, 192.
 * > Pteroptochidae and, Mus. Hein., ii, 1860, 20 (includes Menuridæ).
 * = Pteroptochidæ, Cat. Am. Birds, 1862, 168. — , Handb. der Zool., 1863, 268. — , Proc. Zool. Soc. Lond., 1877, 452. — , Stand. Nat. Hist., iv, 1885, 476. — and  Biol. Centr.-Am., Aves, ii, 1892, 246.
 * = Pteroptochinæ and, Mus. Hein., ii, 1860, 20. — , Bronn's Thier-Reichs, Vög., ii, 1891, 277.
 * = Scytalopodidæ, Proc. Zool. Soc. Lond., 1867, 471, in text.
 * = Scytalopodinæ, Met. Nat. Av. Disp. Tent., ii, 1872, 65 (English translation, 1889, 134).

Tracheophone Mesomyodian Passeres with the metasternum 4-notched; interorbital septum perforate; postorbital processes small, 