NORTHWESTERN MEXICO. 315 



281. Chaulelasmus streperus (Linn.). 

 Mazatlan, Grayson. 



"Abundant from November until late in spring." 



282. Mareca americana (Gm.). 

 Mazatlan, Grayson. 



" This species is abundant from November until late in the spring." 



283. Aix sponsa (linn.). 

 Mazatlan, Col. Abert. 



284. Oairina moschata (Linn.). 

 Mazatlan, Grayson ; Rio Zacatula, Xantus. 



"The wild Musoovy Duck is quite common in this locality throughout the year ; breeds and perches in 

 trees." 



285. Ayiha vallisneria (Wils.). / 

 Mazatlan, Grayson. 



" Not- uncommon during the winter months." 



286. Aytha americana Eyton. 

 Mazatlan, Grayson. 



287. Bucephala americana (Bp.) 

 Mazatlan, Grayson. 



" Common in the winter months." 



Li his notes Col. Grayson gives B. harromi as found at Mazatlan, but not common ; 

 there is no specimen of it in his collection, and as it is strictly a northern species, I think it 

 probable there was an error in its identification. 



288. Fulix marila (Linn.). 

 Mazatlan, Grayson. 



" Found in the winter months." 



289. Fulix affinis Eyton. 

 Mazatlan, Grayson. 



290. Fulix collaris (Don.). 



Mazatlan, Grayson; Rio de Coahuana, Xantus. 



291. Erismatura ruhida (Wils.). 

 Mazatlan, Tepic, Grayson. 



"But seldom seen in the vicinity of Mazatlan." 



