+Tanagra bonariensis+, _Berl. Zeitschr. ges. Orn._ 1885, p. 119; _Scl. Cat. B._ xi. p. 164. +Tanagra striata+, _Burm. La-Plata Reise_, ii. p. 480 (Buenos Ayres, Mendoza, Cordova); _Scl. et Salv. Nomencl._ p. 21; _Durnford, Ibis_, 1877, p. 170 (Buenos Ayres); _White, P. Z. S._ 1882, p. 596 (Catamarca); _Barrows, Bull. Nutt. Orn. Cl._ viii. p. 91 (Concepcion). _Description._--Lores, region round the eyes, and back black; rump orange; head all round and edging of wings and tail blue; abdomen yellow, passing into orange on the breast; bill horn-colour; feet brown: whole length 7 inches, wing 3·6, tail 2·8. _Female_ greyish brown; beneath paler, tinged with yellowish olive on the rump and throat. _Hab._ South Brazil, Uruguay, Paraguay, Argentine Republic, and Bolivia. The plumage of the male of this fine Tanager is rich blue above and yellow beneath; the upper plumage of the female is a uniform dull olive-green, the breast and belly buff-colour. It is a migratory species, which appears in Buenos Ayres in small flocks in summer. Both sexes have a long, sharp, reedy call-note; the male also possesses a song composed of notes with a peculiar bleating sound. 39. PYRANGA AZARÆ, d'Orb. (AZARA'S TANAGER.) +Pyranga azaræ+, _Durnford, Ibis_, 1880, p. 353 (Tucuman); _White, P. Z. S._ 1883, p. 37 (Cordova); _Scl. Cat. B._ xi. p. 186. +Pyranga coccinea+, _Burm. La-Plata Reise_, ii. p. 479 (Paraná, Mendoza). +Pyranga saira+, _Barrows, Bull. Nutt. Orn. Cl._ viii. p. 91 (Concepcion). _Description._--Above dull rosy red; interscapulium and wing-edgings with cinereous tinge; below much brighter, nearly uniform rosy red, duller on the sides; bill plumbeous; feet brown: total length 7·2 inches, wing 3·8, tail 3·1. _Female_ greyish olive; beneath yellow, passing into cinereous on the flanks and belly. _Hab._ Argentine Republic, Paraguay, Uruguay, and Bolivia. This scarlet Tanager appears occasionally in the northern and eastern provinces of Argentina. 40. TRICHOTHRAUPIS QUADRICOLOR (Vieill.). (FOUR-COLOURED TANAGER.) +Trichothraupis quadricolor+, _Scl. et Salv. Nomencl._ p. 23; _White, P. Z. S._ 1882, p. 597 (Misiones); _Scl. Cat. B._ xi. p. 220. _Description._--Above greyish olive; a large, recumbent, vertical crest bright yellow; sides of the head, wings, and tail black; below pale fulvous; under wing-coverts and a cross-bar near the base of the wing-feathers white; bill whitish, plumbeous at base; feet pale brown: total length 6·0 inches, wing 3·3, tail 2·9. _Female_ similar, but without the vertical crest. _Hab._ Southern Brazil, Paraguay, and N.E. Argentina. This species was met with by White in the dense forests of Misiones. 41. THLYPOPSIS RUFICEPS (d'Orb. et Lafr.). (RED-CAPPED TANAGER.) +Thlypopsis ruficeps+, _Scl. Cat. B._ xi. p. 231.