(39) 



being much darkor, dull orange-oohraceons (Ridgw. v. 3), instead of saflVon-yellow. 

 The bill, too, is rather smaller ami slenderer. A', c. tibialis, on the other hand, 

 has the thighs mostl}', and the axillaries and under wing-coverts entirely yellow, 

 while the shonlder-patch is either pnre yellow as in .V. c. cai/anenxiit, or orange- 

 ochraceons as in A', c. Kalencio-buenoi. 



The range of these three forms is, according to our present knowledge, 

 as follows : ^ 



(«) X. cai/anensis cayanensis (Linn.). 



Cayenne; Surinam; Amazonia: Berafica near Pars'i (Steere coll., Mns. Tring) ; 

 Pari, S. Antonio (Snethlage), Island of Marajo (Wallace), Rio Jurna (Garbe colL^ 

 Mns. Panlista) ; Ucayali, East Pern (Bartlett), etc. 



{/)) X. cai/ancnsis valcncio-buenoi (Ihering). 



Interior of Brazil. Northern S. Panlo : Piracicaba, Jaboticabal (Mns. Panlista), 

 Victoria (Hompel), Porto do Rio Parana (Mattercr). Goyaz : city of Goyaz (Baer, 

 Natterer), Paz. Esperanca (Baer). Mattogrosso : Cuyaba (Natterer). 



(c) X. cai/anensis tibialis (Sws.). 



Icterus tibialis Swainson, Aniin. in iFemig. p. .302 (1838. — "Brazil"). 



Eastern Brazil : Rio de Janeiro (one "Rio "-skin in Tring Mns.), Bahia (many 

 skins in Tring), Peruambnco (Forbes), Ceara (two skins in Tring).* 



53. Xanthornus croconotus (Wagl.). 



Psarocoliiis crnronntas Wagler, Isis 1829. p. 757 (" patria specie! praecedentis," sc. " in Mexico " — 

 errore ! we substitute Guiiimt as typical locality ; cf. Lichtenstein, N'miencl. Ai\ Miis. Birnl. 

 1854. p. 51 — typus in Berlin Mus.). 



No. 2374. ? ad,, Rio Aragnaya, Angnst 190G.— Wing 103; tail 104; bill 

 241 mm. 



Agrees perfectly with two specimens from the Rio Napo, Eastern Ecuador. 

 From X.jamacaii (Gm.) this species chiefly differs by having the crown and nape 

 deep orange like the back, the forehead alone being black. Sides of the head 

 and throat Ijlack as in A', jamacaii. 



54. Aaptus chopi chopi (Vieill.). 

 Agelaius chopi Vieillot, Nouv. Did. xxxiv. p. 537 (1819.— ex Azara, no. 62, part. : adult— Paraguay). 



No. 1877. ¥ in change of jilnmage, Goyaz, March 1900.— Wing 112; tail 

 moulting; bill 20^ mm. 



No. 184(). ? (an cf ?) ad., in moult, Goyaz, March 1900.— Wing 122; tail 95; 

 bill2U mm. 



About the geographical races of A. chopi, cf. Abhamll. Ahad. Wissensch. 

 Milnchen, Kl. II. Bd. xxii. 3. 1900. pp. 014-15. 



The specimens agree in size with others from Paraguay and Minas Geraes. 



♦ The specimen from "Eio Clare, Cloiaz (Jujuer)," in the British Museum i^^.J^. r(/,',?^f»f;i,;^be 

 locality, therefore, doubtles serroneous, ..VvauawaS ^■^^■^■^ll"i\^v t 



