( 62) 



? ad. Differs at a glance from the ? ? of D. s. schistaceus (D'Orb.) and JJ. s. 

 capitalis (Scl.) by the coloration of the underparts, which are uniform bright 

 ochraceous (a little paler than Ridgway's plate v. fig. T). Axillaris and quill lining 

 are much brighter, ochraceons buff (Ridgw. v. fig. 10), instead of pinkish buff, and 

 the back is rather more rofescent brown. 



The female of D. s. heterogynus bears a certain resemblance to that of Tkamno- 

 philus incertus Pel/., of the Pars' district, but besides having a shorter tail and a 

 stronger bill, it is much less rufous throughout, and differs at once by the sides of 

 the head being pale brownish with narrow whitish shaft-lines on the ear-coverts. 

 In the ? ? of T. incertus and T. polionotus Pel/., the whole sides of the head are 

 uniform deep ferruginous, like the throat and foreneck. 



It may be useful to give a short review of the "species" allied to D. schistaceus, 

 as they were not well understood hitherto. I have examined the series in the 

 British Museum and in the collections of Tring, Vienna and Count Berlcpsch, as 

 well as several specimens in the Paris Museum. 



a. Dijsithamnus schistaceus schistaceus (D'Orb.) 



Thamnqphilus schietaa us D'Orbigny, Voyage, Oisi awe, p. 170 (1838— Yuracares, E. Bolivia). 

 ThamnophiluB inornatus Ridgway, Proc. U.S.Nat. .Mus. x. 1887. p. 522 (1888— Diamantina, uear 

 Santarem). 



Hab. East Bolivia : Yuracares (D'Orbigny), W. Brazil : Salto Girao and 

 Borba, on the Rio Madeira (Natterer) ; Lower Amazonia : Santarem (Riker).* 



c? ad. Uniform schistaceous, darker above, paler below. The two outer tail 

 feathers sometimes with a slight, white apical margin. Under wing-coverts and 

 narrow edge along inner web of quills white. Graduation of tail 8 to 12 mm. — Wing 

 63—67 ; tail 52—55 ; bill 18, 19 mm. 



? ad. Cap ferruginous, in strong contrast with the pale olive-brown back. 

 Underparts pale brownish buff, more buff on throat and middle of abdomen, more 

 brownish on foreneck and sides of the body. — Wing 64, 65; tail 51 — 55; bill 

 19 mm. 



Material: 1 $ ad., Yuracares, coll. D'Orbigny. (Type of species. — Mas. Paris.) 

 2 S3, 2 ? ¥ from North Bolivia (G. Garlepp coll.) in Bins. Berlepsch ; 1 <$ fere ad. 

 Salto do Girao (Natterer), 2 <$<$, 2 ? ? ad., Borba (Natterer coll.) in Mus. Vienna. 



I compared some of Natterer's specimens with the type in the Paris Museum 

 and with the Boliviau skins in Count Berlepsch's collection, and found them 

 identical. 



b. Dysitkamnus schistaceus snbsp. (Doubtful form). 

 Dytithamnui schistaceus Sclater, Cat. Birds Brit. Mus. xv. p. 224 (part. : a, b, c, i.) 



Hob. North Pern (south of the Amazons) : Chyavetas (Bartlett), Yurimaguas 

 (Bartlett), Maynas (POppig). 



S ad. Two 6 8 from Chyavetas and Yurimaguas in the British Museum, and a 

 third iu the Vienna Museum, collected by Pbppig in the province ..I' Maynas, differ 

 from tin. /'. s. schistaceus by being considerably darker slate-grey and by having 

 the feathers on the forehead and crown centred with blackish. The tail is not quite 

 so much graduated.— Wing 65 — 66 ; tail 50—52; bill 20 mm. 



'/. inornatus is most likely the same as D. .». schutaaue, the fauna of Santarem being essentially 

 that of the Ki" Madeira. 



