PHALACROCOEACIDiE— THE CORMORANTS. 203 



Fhalacrocorax dilophus (Swains.) 



SOTTBLE-CKESTEI) COBMOBAITT. 



Fopular synonyms. Black Loon ; Nigger Goose (coast of Yirginia) ; Black Swan (Nevada) . 



Pelecanus (Garlio) dilophus Sw. & BiCH. F. B,-A. ii, 1831, 473. 

 Fhalacrocorax dilophus Nutt. Man. 'H, 1834, 483.— Aud. Orn. Biog. 11!, 1835. 420; v, 1839, 



629, pi. 257; Synop. 1839, 302; B. Am. vi, 1844,423, pi. 416.— ElDQW. Norn. N. Am, B. 



1881, No. 643; Man. N. Am. ,B. 1887, 78.— CouBS, 2d Check List, 1882, No. 751. —B. B. 



& E. Water B. N. Am. li, 1884, 149.-A. O. U. Check List, 1886, No. 120. 

 Qraoulus dilo hus Geay, Gen. B. ill, 1849.— Baibd, B. N. Am. 1858, 877; Cat. N. Am. B. 



1859, No.623.— CoUBS, Key, 1S72. 303; Check List, 1873, No. 530. 

 Graculus dilophus a. dilophus Coues, B. N. W. 1874, 587. 



Hab. Northeastern North America, breeding from northern United States northward ; 

 south In winter to the Gulf coast, 



Sp. Ghab. Basal outline of the gular pouch extending straight across the throat or 

 projecting slightly back along the median line. Adult, in full breeding plumage: Head, 

 neck, rump, and entl e lower parts, glossy black, with a faint luster of dull bluish green; 

 back, scapulars, and wings, dull grayish brown, each feather conspicuously and broadly 

 bordered with black. A tuft of narrow, engthened, curved feathers on each side the 

 . crown, springing from behind and above the eye, these feathers either wholly black (in 

 eastern specimens), mixed black and white (in specimens from the interior), or wholly 

 pure white (In Paciflc coast examples); neck sometimes, but rarely, with a few scattered 

 white filamentous feathers. Maxilla black, mottled with grayish or dull yellowish along 

 the sides; mandible yellowish or pale bluish, mottled %ith dusky; loral region and gular 

 sac deep orange ; eyelids and whole interior of the mouth bright cobalt-blue, the former 

 somf times dotted with white; iris bright grass-green; jegs and feet deep black." Adult 

 in winter: Similar to the above, but tuits of the head wanting, and the bare skin of the 

 lores, gular pouch, etc., deep yellow instead of orange, and the bluish of the mouth and 

 eyelids absent. Young, first plumage: Head and neck grayish brown, lighter next to 

 the gular sac, darker on the crown and nape; back, scapalars, and wings, dull brownish 

 gray, the feathers bordered with duuky brown; rump dusky brown; primaries and tail 

 dull grayish back; lower parts light fawn-color, darker on the sides, anal-region, and 

 crissum. Bill dull brownish yellow, nearly black on the oulmen; gular sac deep chrome- 

 yellow; iris greenish gray ; legs and feet deep black. Young, in winter: Similar to the 

 above, but throat, chest, and breast paler, sometimes auite white. 



Totaliength, about 29 to 33.6U inches; extent, 45 to 55; wing, 12.00-13.00 (average 12.50) ; 

 tall, 6.50-7.80 (7.15) i oulmen, 2.00-2.46 (i25). 



The Double-crested Cormorant is a transient visitor in Illinois, 

 arriving from the North in September or October and returning 

 from its winter quarters in the Gulf States and Lower Mississippi 

 Valley in March or April, according to the latitude. It doubt- 

 less occasionally remains during mild winters in the southern 

 portion of the State. 



"Like the common Black Cormorant (P. ca^lo), this bird lives 

 entirely on fish, which it catches by pursuing them under water, 



• Audubon gives the fresh colors as follows: "Adult male, at commencement of the 

 hreeding season: Upper mandlule dusky, along the edges grayish- yellow; lower yellow, 

 irregularly marked with dusky toward the edges. Iris bright green, margin of eyelids, 

 bare space on the head, and gular sac, rich orange. Feet and claws black." 



