1918.] NATURAL SCIENCES OF PHILADELPHIA. 247 



the immature white plumage, the other in the adult blue. Iris 

 bright yellow, bill light blue shading to black at the tip, feet greenish. 

 A most abundant species, to be seen at almost any time in almost 

 any quantity. 



61. Hydranassa tricolor ruficoUis (Gosse). Louisiana Heron. 



Female, Gatun, February 18, 1912. Iris bright yellow, bill sooty- 

 black on the culmen, pale yellow at the gonys, bare skin yellow, feet 

 greenish. 



*52. Nycticorax nycticorax naevius (Boddaert). Black-crowned Night Heron. 



An immature female, Mindi, October 29, 1911. Dull gray and 

 somewhat streaked below, but with the top of the head and interscap- 

 ulum greenish-black. 



[53.] Cochlearius zeledoni Ridgway. Zeledon's Boatbill. 

 [54.] Pilherodius pileatus (Boddaert). Capped Heron. 

 55. Butorides striata (Linnaeus). Black-crowned Heron. 



Two males, Gatun, June 9, 1912, and July 16, 1911. Iris bright 

 yellow, bill black with yellow at the base and the gonys, feet yellow. 



*56. Butorides virescens hypernotius Oberholser. West Indian Green Heron. 



Male, Gatun, September 17, 1911. Iris bright yellow, maxilla 

 black with pale tomia, mandible greenish-yellow, feet greenish-yellow. 



[57.] Tigrisoma lineatum (Boddaert). Tiger Bittern. 

 [58.] Tigrisoma cabanisi Heine. Cabanis' Tiger Bittern. 

 59. Ixobrychus exilis (Gmelin). Least Bittern. 



Female, Mt. Hope, September 13, 1913. Iris bright yellow, bill 

 dusky above, yellow below, feet yellowish. 

 A crippled bird, nearly starved. 



*[60.] Botaurus lentiginosus (Montagu). American Bittern. 



ANATIDJE. 



[61.] Cairina moschata (Linnaeus). Muscovy Duck. 



[62.] Dendrocygna autumnalis (Linnaeus). Black-bellied Tree Duck. 

 *[63.] Anas platyrhynchos Linnaeus. Mallard. 

 *[64.] Dafila acuta (Linnaeus). Pintail. 



*65. Querquedula discors (Linnaeus). Blue-winged Teal. 



Female, Mindi, October 22, 1911. Iris brown, bill greenish-black 

 paler below, feet dull yellow with dark joints and webs. 



This bird has rusty stains on the plumage of the entire lower parts. 

 One of a flock on the Mindi marshes. 



*66. Marila afSnis (Eyton). Lesser Scaup Duck. 



Female, Gatun, November 25, 1911. Iris brown, bill blackish, 

 feet bluish-gray with black joints and webs. 



The species was abundant on Gatun Lake on November 26. 



