460 ADDENDA. 



Page 402. Falco aurantius. 

 c. 2 ad. sk. Venezuela. Purchased. 



Page 408. Falco columbarius. 



Mr. Ridgway (B. N. Am. p. 143) adds another variety, which he 

 calls Falco lithofalco, var. sucJcleyi. 



Hah. Oregon to Sitka. F. richardsoni is now thought not to be 

 so thoroughly distinct from the other varieties. 



Page 411. Hierofalco candicans. 



Under the head of his Falco {Hierofalco) gyrfalco (B. N. Am. iii. 

 p. Ill) Mr. Eidgway treats of three races or varieties, which he 

 calls var. candicans, var. islandicus, var. sacer, var. labradora. 



Page 420. Hierofalco mexicanus. 



Mr. Ridgway (B. N. Am. p. 109) makes two races of this bird — 

 var. polyagrus, var. mexicanus, in addition to var. juggur, aU of 

 which he considers to be varieties of F. lanarius. 



