ANATIN^ — THE DUCKS — MERGUS. Ill 



have enlarged ovaries. He did not, however, meet witli any of this species in tlie 

 neighborhood of Mazatlan. 



Tlie specimen procured in Wisconsin was taken on Hock lliver, Xovembcr, 1870. 

 Mr. L. Kumlien is confident that he has since met with one of these birds on Lake 



Koskonong ; but he was not able to secure it. 



Genus MERGUS, Linnaeus. 



Menjus, Linn. S. N. ed. 10, I. 1758, 129 ; cd. I'i, I. 1706, 207 (type, Merg us merganser, Lixx.). 



Char. Bill longer than the head, the breadth uniformly about equal to the depth, the serra- 

 tions conical, acute, and pointed backward ; crest occipital, pointed, or scarcely developed and 



M. merganser. 



depressed. Tarsus nearly three fourths the middle toe, with claw. Tail alwut half the length of 

 the wings. Bill mostly reddish. 



The two North American species of this genus may l)e readily distinguished as follows, the 

 females alone resembling one another : — 



1. M. merganser. Nostril situated near the middle of the maxilla ; frontal feathers extend- 

 ing farther forward than those on lateral base of bill. Adult male: Head and most of 

 the neck greenish l)lack ; head scarcely crested ; jugulura and other lower parts creamy 

 white, or pale salmon-color. Adult female: Head and neck reddish (chin and throat 

 white), the occiput with a full crest of lengthened feathers. Above, chieflv bluish gray. 

 a. Merganser} Black bases of the greater wing-coverts entirely concealed by the over- 



^ Meuous merganser. 



Mcrgns merganser, Linn. S. N. eJ. 10, L 1758, 129; ed. 12, I. 1766, 203. — Xaum. Yog. 

 Deutschl. XII. 1844, 356, pi. 326. 



Mcrgus ruhrica2nlla, BuiixN. Orii. Bor. 1764, 22. 



Mergus castor, Linn. S. N. I. 1766, 209. — Keys. & Blas. Wiib. Eur. 88. —Gray, Gen. B. 

 III. 629 ; Cat. Biit. B. 1863, 208. 



Merganser castor, Bonap. Comp. List, 1838, 59. — Macoill. JLui. II. 194. 



Merganser Raii,'Lv.kCH , Syst. Cat. 1816, 36. — Stk-ph. Gen. Zool. -Xll. 1824, 161, pi. 53. 



Mcrgus gido. Scop. Ann. I. N. H. 1769, 69. 



Goosander, Yarr. Brit. B. ed. 2, III. 395, lig. ; ed. 3, III. 398, tig. 

 Hab. Palsearctic Eegion. 



