550 PROCEEDINGS OF TUE NATIONAL MUSEUM. tol. 42. 



outer webs of inner secondaries, with greater, median, and lesser 

 wing-coverts, dark, slightly glossy bottle green; the first rows of 

 lesser wing-coverts margined all around with tawny, the other rows, 

 the median coverts, and outer webs of tertials, with ochraceous 

 buff, the greater coverts and outer webs of innermost secondaries 

 with cream buff or whitish; tail dark, glossy bottle green; chin and 

 middle of upper throat cream white, the latter heavily streaked with 

 brownish black; jugulum purpUsh maroon, conspicuously streaked 

 medially with creamy white and dark brown; breast, abdomen, 

 sides, crissum, and axillars rather deep slate gray, with a decided 

 brownish tinge, the middle of abdomen and the crissum a little 

 paler, the latter whitish, the longest feathers of under tail-coverts 

 with large black subterminal patches; thighs brownish gray, more 

 rufescent exteriorly; lining of wing deep gray, the feathers mar- 

 gined with ochraceous, buff, or whitish; the edge of wing broadly 

 buffy white. 



Measurements. — Male: ^ Wing, 168-177 (average, 173.1) mm.; tail, 

 58.5-69.5 (63.4); exposed culmen, 56-64 (60.7); height of bill at base, 

 11-13 (11.9); tarsus, 46.5-53 (50.4); middle toe, 43-48 (45.1). 



Female: 2 Wing, 158-180.5 (172.2) mm.; tail, 60-71.5 (66.2); 

 exposed culmen, 55-63.5 (59.1); height of bill at base, 11-12 (11.7); 

 tarsus, 46-52 (49.9); middle toe, 40-46.3 (43.7). 



Type-locality. — Rio Indio, near Gatun, Canal Zone, Panama. 



Geograpliical distribution. — Southern Central America and northern 

 South America: north to San Jose, central Costa Rica; Gatun, 

 northern Panama; Bonda (Santa Marta), northern Colombia; Zulia 

 and Lake Valencia, northern Venezuela; east to Trinidad Island; 

 Cayenne, French Guiana; Rio Counani and Para, northeastern Bra- 

 zil; south to the Capim River, northeastern Brazil; Merida, central 

 Venezuela; Medellin (Antioquia), and Honda (Tolima), northwest 

 central Colombia; west to Medellin, Colombia, and San Jose, Costa 

 Rica. 



The difference in size between this form and Butorides virescens 

 virescens is sufficient to separate them; but it is doubtful that any 

 color characters of importance exist, since the darkest birds in the 

 series of Butorides virescens Jiypernotius are in this respect absolutely 

 indistinguishable from specimens of B. v. virescens. 



The female of Butorides virescens Jiypernotius averages about as 

 large as the male. There are, however, two adult females from 

 Panama, No. 206341, U.S.N.M., taken February 19, 1911, near 

 Gatun, and No. 206347, U.S.N.M., taken April 9, 1911, near Taber- 

 nilla, that are very large (wing 180.5 and 180 mm., respectively) ; yet, 

 since the date of the latter falls within the breeding season, they are 



' Fourteen specimens, from Panama, Costa Rica, Colombia, and Venezuela. 

 2 Six specimens, from Panama and Costa Rica. 



