4 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
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; sterno- 
trachealis not attached to processus vocales; palate schizognathous; mesor- 
hinium normal; nostrils not conspicuously operculate; tarsal envelope 
OXASPldean a:c23cac.'n's'cteccikenegeaceeehets ne Conopophagide (extralimital).¢ 
bb. Metasternum 2-notched; tensor patagii brevis tendon normally passerine. 
Formicariide (p. 8). 
aa. Two pairs of tracheo-bronchial muscles; metasternum 2-notched; tarsal envelope 
endaspidean. 
6. 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. 
Furnariide (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 segithognathous 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, slouterse sa exe es se cieiercmrsieast ae eles sees oe Dendrocolaptidz (p. 224). 
Family PTEROPTOCHIDA. 
THE TAPACULOS.<¢ 
=Rhinomydzz D’OrBieny Voy. Am. Mérid., iv, part 3, 1839, 192. 
>Pteroptochidae CaBanis and Heine, Mus. Hein., ii, 1860, 20 (includes 
Menuridz). 
=Pteroptochidz Scuater, Cat. Am. Birds, 1862, 168.—Carvus, Handb. der Zool., 
1863, 268.—Garrop, Proc. Zool. Soc. Lond., 1877, 452.—Sresnecer, Stand. 
Nat. Hist., iv, 1885, 476.—Satvin and Gopman Biol. Centr.-Am., Aves, ii, 
1892, 246. 
= Pteroptochinae CaBanis and Heinz, Mus. Hein., ii, 1860, 20.—Gapow, Bronn’s 
Thier-Reichs, Vég., ii, 1891, 277. 
=Scytalopodidx Huxury, Proc. Zool. Soc. Lond., 1867, 471, in text. 
=Scytalopodine SunDEvaLL, 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, 
« =Conopophagine Sclater and Salvin, Nom. Av. Neotr., 1873, 41; Gadow, Bronn’s 
Thier-Reichs, Vég., ii, 1891, 277.=Conopophagide Garrod, Proc. Zool. Soc. Lond., 
1877, 452; Forbes, Proc. Zool. Soc. Lond., 1881, 436, 438; Stejneger, Stand. Nat. 
Hist., iv, 1885, 476; Cope, Am, Nat., xxiii, 1889, 873; Salvin and Godman, Biol. 
Centr.-Am., Aves, ii, 1892, 245. 
A small group of two genera and about sixteen species, peculiar to South America, 
from Colombia to Guiana, southeastern Brazil, Bolivia, and Peru. 
>The returning portion not concealed by the muscular fiber at the origin of the 
extensor metacarpi muscle, but the two tendons of this portion clearly exposed to 
view. (See Stejneger, Standard Nat. Hist., Birds, p. 459 and fig. A on p. 458.) 
¢ A Spanish (Chilean) vernacular name, from the characteristic habit of the various 
species of this group of carrying the tail conspicuously elevated and thrown forward. 
