30 Direclor' s A)i)iual Report. 



Genus HYPOT^NID^ RkichExNbach. 



19. Hypotsenidia oustini Oustalet. Koko. Oustalet's 



Rail. 



Hvpii/tDiidia marchri, K. Ovistalet, Arch. Mus. Paris (3), 1896, VIII., pp. 32-34. 



General color above olivaceous brown ; no white spots on 

 mantle or back. In No. 9540 the ends of the feathers on the back 

 of the neck are so worn that they give the appearance of yellowish 

 markings to this region ; rump brown ; greater wing coverts uniform 

 with the coloring of the mantle ; lesser and median wing coverts 

 barred with black and white ; primaries, secondaries and tail 

 feathers barred with black and white. This marking on the tail 

 feathers, however, varies considerably. In No. 9536 the tail 

 feathers are almost uniform ochraceous brown with but a few white 

 dots on the webs ; top and sides of head uniform with coloring of 

 the mantle ; bvit in No. 9531, however, the}- are a shade darker 

 than the mantle. A sharply defined superciliary stripe of ashy 

 gray extending from near the base of bill to the sides of nape, the 

 anterior part of this stripe narrow and white. With the exception 

 of this stripe the coloring of the sides of head and neck are uniform 

 with mantle. Beginning sharply on a line with the gape and ex- 

 tending to the shoulders is the plumbous gray of the under neck 

 and breast, merging into white on the chin. Two of the specimens, 

 Nos. 9537 and 9540, show a slight trace of rufous in this plumbous 

 gra}'- of the fore breast. Beginning at the fore breast and extend- 

 ing over the entire under surface of the bod3^ including flanks and 

 under tail coverts, the bird is barred with black and white, these 

 bars especially large and distinct on the flanks, while on the belly 

 they are narrow and not so marked ; bill dusky ; feet grayish with 

 brownish cast ; iris an Indian red. I find no diflerence in the color- 

 ing of the se;xes. No. 9538, a fledgling three inches in length, is 

 covered with a uniform sooty black down ; bill and feet dusk}' ; 

 eyes dark brown. This bird is closely allied, if not identical with 

 R. philippinas. It seems, however, to be a little larger, and with- 

 out the rufous coloring on the flanks. Hab. Marianas. 



Genus POI^IOLIMMAS Sharp. 

 20. Poliolitnmas cinereus Veill. Gray Rail. 



Pi/rphyrio cinereus, Veill., Nouv. Diet., 1819, XXVIII., p. 29. 

 Poliulimmas cinetea, Sharp, Bui. Brit. Orn. Club, 1S93, V., p. 2S. 



The natives call this bird the Koko, the same name they give 

 to the big Oustins Rail, and they regard it as the young of the 



