BIRDS OF NORTH AND MIDDLE AMERICA. 47 



to the Furnariidge) , but the latter has the prunaries, primaiy coverts, 

 and ahila sooty blackish, and under parts of the body spotted rather 

 than streaked. 



Thamnophilus, sp.? Cassin, 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.). — Salvin and Godman, 



Biol. Centr.-Am., Aves, ii, 1892, 199 (Turbo). 

 [Thamnophilus] virgatus SnARi-E, Hand-list, iii, 1901, 12. 



Genus ERIONOTUS Cabanis and Heine. 



Erionotus'^ Cabanis and Heine, Mus. Hein., ii, Aug., 1859, 15. (Type, Thamno- 

 philus cserulescens Vieillot.) 



Medium-sized or rather small Formicariidge (length about 140-150 

 mm.), with bill more compressed than in Thamvophilus 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 antiie 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 antiae), 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 antise, and lores, 

 with distmct terminal setas. 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 



°"Von 'ipiov (WoUe) und vcDroc (Riicken)." (Cabanis and Heine.) 



