BIRDS OF NORTH AND MIDDLE AMERICA. 47 
to the Furnariide), but the latter has the primaries, primary coverts, 
and alula sooty blackish, and under parts of the body spotted rather 
than streaked. 
Thamnophilus, sp.? Casstn, Proc. Ac. Nat. Sci. Phila., 1860, 189 (Turbo, 
Colombia). 
Thamnophilus virgatus LAWRENCE, Proc. Ac. Nat. Sci. Phila., xx, 1868, 361 
(Turbo, Colombia; coll. Acad. Nat. Sci. Phila.).—Sanvin and Gopmay, 
Biol, Centr.-Am., Aves, ii, 1892, 199 (Turbo). 
[Thamnophilus] virgatus SHARPE, Hand-list, iii, 1901, 12. 
Genus ERIONOTUS Cabanis and Heine. 
Erionotus ¢ CaABANIs and Hetne, Mus. Hein., ii, Aug., 1859, 15. (Type, Thamno- 
philus cerulescens Vieillot.) 
Medium-sized or rather small Formicariide (length about 140-150 
mm.), with bill more compressed than in Thamnophalus and coloration 
very different, the plumage without bars, either above or below. 
Bill variable in size (nearly as long to only about half as long as 
head), its width at frontal anti not greater than its height at same 
point and equal to less than one-half to decidedly more than one- 
half the distance from nostril to tip of maxilla; culmen slightly to 
distinctly ridged, nearly straight for most of its length, strongly 
decurved terminally, the tip of maxilla distinctly (sometimes strongly) 
uncinate; maxillary tomium straight, slightly but distinctly notched 
subterminally; mandibular tomium straight, slightly but distinctly 
notched and toothed subterminally, the tip of the mandible forming 
a small but distinct recurved point; gonys moderately convex (more 
strongly so basally), recurved terminally. Nostril exposed (but pos- 
teriorly in contact with feathering of the latero-frontal antis), oval 
or roundish, without operculum, with the interior tubercle slightly 
visible in posterior portion. Rictal bristles present but minute (prac- 
tically obsolete); feathers of chin, malar and frontal anti, and lores, 
with distinct terminal sete. Wing moderate or rather large, with 
longest primaries decidedly longer than secondaries; fourth, fifth, and 
sixth, or fifth, sixth, and seventh primaries longest and equal (or the 
fifth slightly longer than fourth, the latter equal to sixth), the tenth 
(outermost) about three-fifths as long as the longest, the ninth equal 
to or shorter than secondaries. Tail four-fifths to more than five- 
sixths as long as wing, much rounded (graduation less than length of 
middle toe without claw), the rectrices (12) moderately broad or 
rather narrow, rounded terminally. Tarsus longer (sometimes much 
longer) than exposed culmen, one-third as long as wing or a little 
‘less, distinctly scutellate, the plantar scutella in two longitudinal 
a*Von Zocov (Wolle) und vétoc (Riicken).’’ (Cabanis and Heine.) 
