224 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



3. Garzetta.— Size gmall. Adult with occipital, jugular, and 

 scapular plumes, the latter reaching to or a little beyond the 

 end of the tail ; the shafts moderately rigid, and recurved ter- 

 minally; the webs decomposed, with long, hair-like, but not 

 distant fibres. Other plumes varying in structure, according 

 to the species. Color entirely pure white. 



4. DiCHROMANASSA. — Size medium. Adult with the feathers of 

 the entire head and neck, excepting the throat and foreneck, 

 elongated, linear, lanceolate and stiffish, most elongated on the 

 occiput and jugulum. Scapular plumes extending beyond end 

 of tail ; the shafts rigid, the webs decomposed, with rather 

 close, hair-like fibrillae. Color wholly pure white, or plumbeous, 

 with or without reddish neck. Tarsus twice as long as middle 

 toe. 



5. Hydeanassa. — Size medium. Adult with an occipital tuft 

 of several elongated, lanceolate white feathers. Jugular 

 feathers broadly lanceolate, with distinct outlines. Scapular 

 plumes hair-like, extending a little beyond the tail. Color 

 mainly plumbeous, with lower parts and rump white. Bill 

 longer than tarsus. 



6. Florida. — Size small. AdwZi with scapular plumes elongated, 

 extending to or beyond end of tail, linear lanceolate, with com- 

 pact webs; jugular plumes similar; occipital plumes hair-like, 

 a few of them much elongated. Color pure white, with bluish 

 tips to outer primaries; dark slate-blue, with maroon-colored 

 head and neck, or variously " patched " with blue and white. 



7. BuTORiDES. — Size small. Adult with scapular plumes elon- 

 gated, compact- webbed, lanceolate, but with rounded tips. 

 Feathers of the pileum elongated, lanceolate. Jugular plumes 

 broad, blended. Cuhnen longer than tarsus ; middle toe almost 

 equal to tarsus. Color much variegated. 



8. Syrigma. — Size medium. Adult with several elongated, nar- 

 row, compact-webbed, round-tipped, somewhat rigid and 

 slightly recurved plumes on lower part of occiput. Jugular 

 feathers soft, broad, blended. No scapular plumes. Culmen 

 about equal to middle toe. Color much variegated, the tail 

 and lower parts white. 



9. PiLHERODius. — Size medium. Orbits and anterior part of 

 malar region naked. Occiput with two extremely elongated 

 linear, compact-webbed plumes. Jugular plumes broad, 

 blended. No scapular plumes. Cololi* white, the (;rown and 

 occiput black. Middle toe shorter than culmen ; culmen 

 shorter than occiput. 



10. Nyctiardea. — Size medium. Adult with several extremely 

 elongated linear, compact-webbed occipital plumes. No scap- 



