( 231 ) 



lowland examples. In the shade of the upper parts I cannot discover anj' constant 

 difference between the two series. Adult Roraima birds are b}' no means lighter 

 rnfons brown than those from Bartica Grove or Snperuaam, and for the present I am 

 nuable to discriminate more than one form in British Guiana. 



Thus, T. c. griseiqula may be characterised as being similar to T. c. coraija, 

 bnt as a rule easily distinguishable by the ochraceous or ochreons brown colour 

 of the lower jjarts, though occasionally specimens may be found which closely 

 resemble the typical race. 



Nomenclature. — The earliest available name is apparently Fonnicivora 

 griseigula, founded upon an immature example from British Guiana. The de- 

 scription leaves no doubt as to its identity, which, moreover, has been confirmed by 

 Dr. J. A. Allen through examination of the type specimen. 



3. Thi-ijothorua conv/a herberti Ridgw. 

 Thi-i/othoms herherii (Riker MS.) Ridgway, Pmc. U.S. Mu.<!. x. 18S7, p. ollJ (1888.— Diamantina, 



near Santarem, Lower Amazons) ; Chapman and Riker, Aiil,\ vii. 1890, p. 2G6 (Diamantina). 

 T. eoraya herherti HcUmayr, Journ.f. Oni. 61. 1903, p. 533 (part.: Cara-raucii). 

 T. coi-aya (errore) Pelzeln, Zur- Orn. Bms. i. p. 48 (part : Cara-rauou, Lower Amazons). 



Hab. — North Brazil, south bank of the Lower Amazons : Diamantina, near 

 Santarem (Riker), Cara-raucu (Natterer). 



Adult. — Nearest to T. corui/a corai/a, from Cayenne and Manaos, bnt differs 

 by having the sides of the head almost uniform black (relieved only by a very 

 narrow, inconspicuous, white superciliary streak and a few extremely narrow lines- 

 of the same on auriculars) ; the upper parts much brighter, more chestnut rufous ; 

 the light tail-bands cinnamon-brown instead of dull greyish ; the foreneck and 

 chest more purely buffy grey without brownish suffusion ; and the flanks less 

 extensively as also paler rufescent brown. 



Material. — One c? ad. from Cara-raucii, Lower Amazons, J. Natterer coll., 

 Vienna Museum. Wing 62 ; tail 58 ; bill 161 mm. 



Obsercations. — This specimen agrees very well with Mr. Ridgway's description, 

 and appears to be decidedly distinct from T. c. coraija. The pileum and nape are 

 dnll sepia brown, slightly tinged with uiuber or rufescent, the remaining upper 

 parts, including wing- and tail-coverts, bright chestnut rufous. Underneath it 

 resembles the Cayenne form, but the breast is somewhat .paler and lacks the 

 brownish suffasion, while the flanks are lighter brown. There is, however, no 

 difference between the two races either in size or in the shape of the bill. From 

 T. coraya amnzonicas, of Upper Amazonia, T. c. herberti may be distingnished by 

 the reduction of the white markings on sides of head, by the cinnamon-brown 

 (instead of dnll greyish) tail-bands and by the bright chestnut-rnfous upper parts. 

 Seen from below the two races are perfectly alike. 



4. Thnjothorus coraija amaz07iicus Sharpe. 

 TImjolhorus ainazoidcus Sharpe, Cai. B. Brit. Mm. vi. p. 235, tab. 15, fig. 1 (1881.— Saraya9U, 



Ucayali, Eastern Peru) ; Berlepsch, .Imtrii.f. Orn. 37, 1889, p. 293 (Yurimaguas). 

 '/'. i-'jioija amazoukm Hellmayr, Jaiirn.f. Orn. 61, 1903, p. 533 (crit. : Yurimaguas). 

 r. corai/a (errore) Sclater and Salvin, J'.X..-i. Lund. ISGO, p. 178 (part.: Saraya^u) ; iidem, I.e. 

 1873, p. 257 (part. : Sarayat-u) : Taczanowski, P.Z.H. 1882, p. 5 (Yurimaguas). 

 //ai.— Northern Peru, south of the Maranon : Sarayagu, Ucayali R. (Bartlett) ; 

 Yurimaguas, Hnallaga II. (Stolzmann, Garlepp). 



Adult.— M.nc\\ like T. c. corai/a, and only distinguishable by its lighter, rufons- 

 browu uj)pftr parts and less rufescent-brown flanks. The bill is by no means 



