214 F0K1IICARIID.13. 



son, P.Z. S. 1870, p. 118 (Buenos Ayres) ; Durnforrl, Ihis, 1877, 

 p. 183, et 1878, p. 02 (Buenos Ayres) ; WJnte, P. Z. 8. 1882, p. 014 

 (rep. Arp'.) ; Barrows, Aiik, 188o, p. 21 (Entrerios) ; Gidsoti, Ibis, 

 1885, p. 281 (Uruguay). 



Above ciuereovis ; interscapulium, wings, and centre tail-feathers 

 brownish ; cap rufous ; lateral tail-feathers black, with white cross 

 bars on the inner webs, outer webs brownish : beneath dirty white, 

 with numerous narrow but distinct black cross bars on the breast ; 

 under wing-coverts pale fulvous ; bill plumbeous ; feet black : whole 

 length inches, wing 2S, tail 2-6. Female. Above like the male, 

 but whole tail pale rufous : beneath pale fulvous, with faint indica- 

 tions of cross bars on the breast. 



Ilcih. Paraguay, Uruguay, and La Plata. 



Tliis species is allied to 2\ torquatus, but distinguishable by its 

 rufous head and the different colour of the tail. 



«, I), c? $ ad.sk. Conchitas, Buenos Ayres (Hudson). Sclater Coll. 



c. cJ ad. sk. Las Conchas, Buenos Ayres. II. Durnford [C.]. 



d. c? ad. sk. La Plata. Bravard [C.]. 



55. Thamnophilus subfasciatus. 



Thamnophilns subfasciatus, Scl. et Salv. P. Z. S. 1876, p. 357, 

 pi. xxxiii., et 1879, p. 023 (Bolivia) ; Tacz. P. Z. S. 1880, p. 201 

 (N. Peru) ; ul. Orn. Per. ii. p. 18. 



Above cinereous ; upper back with a slight olivaceous tinge ; cap 

 and edgings of wings rufous : beneath cinereous ; breast and middle 

 of abdomen white, distinctly barred with black : tail black, lateral 

 rectrices barred with white on the inner webs ; under wing-coverts 

 cinnamoraeous: whole length 5*5 inches, wing 2-7, tail 2-6. Female. 

 Above brownish ; cap, edgings of wings, and tail rufous : beneath 

 deep ochraceous. 



Hah. Bolivia. 



Similar to T. ruficapUhis, but lower belly strongly barred, and 

 the black bars closer and more distinct. 



a,b. c? $ ad. sk. Bolivia {Buckley). Salvin-Godman Coll. 



(Types of the species.) 



4. BIATAS. 



Type. 



Biastes, Peichenb. Handh. p. 175 (1853) B. nigropectus. 



Biatas, Cnb. et Heine, Miis. Hein. ii. p. 19 (1859). . . . B. nigropectus. 



This singular form was originally described by Lafresnayo as a 

 Dondrocolaptine l)ird — an error which its style of plumage easily 

 accounts for. But the structure of the bill and feet shows that it 

 belongs to the Formicariida', though abnormal in coloration ; and 

 this is probably its best position. It is peculiar to S.E. Brazil. 



