VO l889. n '] PROCEEDINGS OF THE NATIONAL MUSEUM. 25 



gradually into dull dark sooty brown on rest of under parts; lower 

 tail-coverts tinged with dark chestnut. Upper mandible black, lower 

 chiefly light colored; legs and feet brownish black. Leugth (skin), 

 6.00; wing, 3.45; tail, 2.55; exposed cuhnen, .85; tarsus, .85. 



Since the above was written I have received a specimen of 8. albogu- 

 laris Scl. from Dr. P. L. Sclater, who writes me that my 8. canigularis, 

 the type of which was submitted to him for examination, is the same 

 species. I can not, however, see why he should hold this view, since, 

 placing side by side the type of 8. canigularis, Dr. Sclater's 8. albigu- 

 laris (from Venezuela), and any one of several specimens of 8. um- 

 bretta (Light.) (from Brazil), it is at a glance obvious that 8. canigularis 

 is much more different from 8. albigularis than the latter is from 8. 

 umbretta, though the two latter are distinct enough. 



8. canigularis is altogether a darker-colorea bird than 8. albogularis, 

 of which the U. S. National Museum possesses an example from Tobago 

 (No. 74884, F. A. Ober, collector), agreeing very closely with Dr. Scla- 

 ter's Venezuelan specimen. 



The differential characters of the three species may be expressed as 

 follows : 



a 1 . Feathers of throat tipped or broadly margined with olive-brownish. 



Under parts light bistre-brown, tinged with olive, becoming russet-brown on 



chest. Hob. Brazil S. umbretta. 



a 2 . Feathers of throat without brownish tips or margins. 



ft 1 . Under parts dull grayish olive, becoming tawny-olive on chest ; back and scap- 

 ulars bistre-brown tinged with olive ; lower half of throat dull light gray; 

 upper half, including chin, dull white. Hob. Venezuela and Tobago. 



S. albogularis. 

 b 2 . Under parts dark slaty, tinged, on tips of some feathers, with bright mummy- 

 brown, the chest deep burnt-umber brown ; low.er half of throat deep gray- 

 ish ; upper half, including chin, paler, but scarcely approaching white; back 

 and scapulars deep vaudyke-brown. Hab. Costa Rica S. canigularis. 



Sclerurus mexicanus Scl. 



1 Sclerurus ruficollis SWAINS., "Birds Braz.," n [" 1834-1841"], Tb. 79. 



Sclerurus mexicanus Scl., F. Z. S., August 8, 1856, 290 (Cordova, Vera Cruz, Mexico) ; 

 1859, 365 (Jalapa) ; 1864, 175 (city of Mexico) ; Cat. Am. B., 1861, 149 (Cor- 

 dova, Mexico; Cobau, Guat.).— Scl. & Salv., Ibis, 1860, 35 (Coban) ; P. Z. 

 S., 1867, 574 (Capim R., Lower Amazon), 750 (Yuriniaguas and Chyavetas, 

 E. Peru) ; Noiu. Neotr., 1873, 62 (Mexico to Amazonia). — Lawr., Ann. Lye. 

 N. Y., vn, 1862, 465 (Panama).— Salvin, P. Z. S., 1867, 14 (Veragua).— Sum- 

 ichr., Mem. Bost. Soc.,i, 1869,555 (Vera Cruz). — Taczan., Orn. duPdrou,n, 

 1884, 115 (Yurimaguas). 



Sclerurus gautemalensis (sic) Lawr., Ann. Lye. N. Y., vn, May, 1863, 4 (Isth. Panama).* 



* This reference of Mr. Lawrence's S. guatemalensis is made on the strength of his 

 having previously mentioned the specimen to wnich it refers (under name of S. mexi- 

 canus) as having a rufous throat, which at once distinguishes S. mexicanus from S. 

 guatemalensis. What is probably the very same specimen is now before me and is 

 labeled in Mr. Lawrence's handwriting " Sclerurus gautimalensis." Its locality is Lion 

 Hill, near Aspinwall (No. 41585, U. S. Nat. Mus.). 



