206 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



rufescent Inown to brownish g'ray above, and on the lower surface 

 from almost uniform deep, dull buff to pale buff' which is even 

 almost white medially. The bird described by Mr. Stone as Troglo- 

 dytes coluinhse''' seems to be without much doubt nothing- more than a 

 somewhat extreme or peculiar example of this excessive individual 

 variation, for all of its characters can be very closely matched in the 

 series of xfi'uitHlu)i available in the present connection. Notwithstand- 

 ing" the contrary intimations of Mr. Stone,* striatuhis quite frequently 

 has the lower parts almost uniform ochraceous, a character he claims 

 as distincti^'e of his eolumhse. 



TROGLODYTES MUSCULUS TOBAGENSIS (Lawrence). 

 Troglodytes tobagensis Lawrence, Auk, V, 1888, ]x 404. 



Tj/jM locality. — Tobago, \\|^est Indies. 



Geographical distrihatloii. — Island of Tobago, West Indies. 



This island race is similar to clarus, with which it has often been 

 synonymized, but from which it differs in its conspicuousl}' larger 

 size, particular!}^ the wing- and bill, and in usually somewhat paler 

 flanks, crissuni. and upper parts. Measurements of two specimens are 

 as follows : 



a Type. 



TROGLODYTES MUSCULUS CLARUS Berlepsch and Hartert. 



? Motacilla farva Gmelin, Syst. Nat., I, 1788, p. 994. 



Troglodytes rufidus Auct. , not Cabanis. 



Troglodytes musculus darns Berlepsch and Haktert, Novit. Zool., IX, 1902, p. 8. 



Type locality.— Altagracia, Oronoco River, Venezutda. 



Geographical distrihution. — Venezuela, Guiana, and the valley of 

 the Lower Amazon. 



This subspecies differs from Troglodytes musculvs niuscalus in being 

 rather paler above and very much so below, the median portion of the 

 lower surface frequently white or whitish. From atrial alus it may be 

 separated by its decidedly more rufescent upper parts, flanks, and 

 crissum. 



Not inqjrobabl}' there are two races here united under the name 

 clarus^ as birds from the Amazon seem to be less rufescent than those 

 from Venezuela, though this difference ma}^ be due to the paucity of 

 our material, a conclusion rendered more probable bv the demon- 

 strated existence of a great amount of individual variation in specimens 



aProc. Acad. Nat. Sci. Phila., 1899, p. 308. 



«>ldem., pp. 308, 309. 



