1917-] Recently published Ornithological Works. 107 



' Aiik ' ill wliich Dr. SliuFeldt draws the attention of 

 Dr. Lowe to a paper by himself in the American Naturalist 

 for IQO^, in which he placed the Sheathbills between the 

 Waders and the Gulls, and which apparently esca|)ed 

 Dr. Lowe's attention when he wrote his paper on this 

 group (see ' Ibis/ 1916, p. 122). 



Swart h on the Arizona Screech Owls. 



[Tlie S.aliuaro Screecli Owl as a recognisable I\ace. By H. S. Swarth. 

 Condor, xviii. 191G, pp. Kio-IGS.] 



In this short note Mr. Swartii defends the recognition of 

 a Screech Owl [Otus asio (jilmani), described by liira some 

 years ago, which has been denied recently by Mr. Ridgway 

 in his ' Birds of Middle and North America' (part 6, 11)14, 

 p. 702, footnote). He has gone into the matter afresh with 

 additional specimens to examine, and has come to the con- 

 clusion that two distinct subspecies exist in Arizona — 

 0. a. cineracens in the higher mountains of tiie upper 

 Sonoran zone, and 0. a. (jilmani in the hot lower Sonoran 

 valleys. The first inhabits oak-covered foot-hills and 

 canyons, the second open plains, where it finds a congenial 

 nestinii;-site in the giant cactus, so conspicuous a feature of 

 that region. 



Todd on the genus Dysithamnus. 



[On Di/sithamnus mentalis and its Allies. By W. E. Clyde Todd. 

 Bull. Amer. Mus. N. H. New York, xxxv. 1916, pp. 533-560.] 



Among the rather obscure members of the family of Ant- 

 Thrushes confined to Central and South America, the species 

 allied to Dysithamnus mentalis appear to hold a prominent 

 place. They have been alternately lumped under one name 

 and separated into a number of subspecific forms by various 

 writers. 



In the present article Mr. Clyde Todd gives the results of 

 his examination of 276 specimens gathered from the prin- 

 cipal museums in the United States. A key of the adult 

 plumages is given, and a review of the various forms with 

 synonymy and descriptions, and in some cases sketch-maps 

 of their distribution. Three new forms are described for 



