AUGUST, 1915. NOTES ON SOUTH AMERICAN BIRDS CORY. 309 



abdomen pallid mouse gray; middle of abdomen ashy 

 white; thighs, lower abdomen and under tail coverts 

 between pale neutral gray and pallid neutral gray, 

 much paler than in any other known form; under 

 surface of rectrices strongly rufescent; wing, about 

 148; tail, about 285 mm. 



Piaya cayana cearce Cory. Qua, Ceara, 

 Brazil) Northeast Brazil (Ceara). 

 Back between auburn brown and chestnut bay; 

 throat vinaceous fawn; upper abdomen between 

 smoke gray and light neutral gray; lower abdomen 

 neutral gray; under tail coverts near dark neutral 

 gray. Approaches cayana cayana, but brighter 

 coloration above, rusty marking on under surface of 

 rectrices and somewhat smaller size will distinguish 

 it. Wing, about 140; tail, about 240 mm. 



Piaya cayana insulana Hellmayr. (Trinidad) 

 b 1 Under tail coverts black. 



Back between bay and mahogany red; throat fawn 

 color; under wing coverts pale mouse gray; upper 

 abdomen between neutral gray and smoke gray; lower 

 abdomen, thighs and under tail coverts deep black; 

 wing, about 140; tail, about 285 mm. 



Piaya cayana cauca Stone. (Rio Cauca, 

 Colombia) Cauca Valley and possibly south 

 to Ecuador.* 



b. Under surface of rectrices blackish or at most with a tinge 

 of ^rufous or rusty on some feathers. 

 c 1 Under tail coverts grayish. 



Back chestnut bay, between claret brown and Hessian 

 brown; throat vinaceous fawn; upper abdomen be- 

 tween smoke gray and neutral gray; lower abdomen 

 neutral gray; under tail coverts near dark neutral 

 gray; under wing coverts whitish ashy; wing, about 

 143; tail, about 280 mm. 



Piaya cayana cayana (Linn.). (Cayenne) 

 Guiana, eastern Venezuela and northern 

 Brazil. 

 d 1 Under tail coverts blackish. 



Back between bay and chestnut; upper abdomen 



* A specimen in the U. S. National Museum Collection, No. 236439, labeled 

 "Ecuador," is apparently this form. 



