KEY TO THE GENERA. 
(p) Hind toe simple; head crested, and narrow tip of bill formed wholly by the nail, . . . . . . AIX 
—not crested; bill ywch wider at end than at base, . .. One SPATULA 
—not wider; tail cuneate, } or more of ines wing, . . DAFILA 
—not cuneate, not } the wing. (p? ) 
(p?) Bill head; crown streaked; tl. fthrs faces acter Qandyg.of . DAFILA 
—creamy or white; speculum green, . . . . . MARECA 
—about=hd.; speculum white: wing coverts chestnut, CHAULELASMUS 
—little>hd. speculum violet, black and white bordered, . . . . ANAS 
— green; wing coverts sky blue, . QUERQUEDULA 
Foun gare Re NETTION 
(p) Hind toe lubed; cheeks bristly. Colors black and white, . . . « . « « CAMPTOLZMUS 
tail pointed ; in the adult=or> wing; bill black ail onaaees coe + « . DARED A 
— rounded, the feathers stiff, lance- aan exposed to their bases, , . ERISMATURA 
— Ducks with none of the foregoing characters. (p*) 
(p*) Up. mand. gibbous at its unfeathered base. Black or brown,. . . . . G2DEMIA 
—not gibbous where unfeathered; nail narrow, distinct. (p*) 
—broad, fused. (p5 
(pt) Head black or gray, with white; nost. nearly median; b. about s.. BUCEPHALA 
—reddish or brownish, no white; nost. nearly median; b.>trs., . AYTHYA 
—black or brown; nost. subbasal; b.>trs., . . 6 feo & Wlutne.< 
(p®) Feathers not extending on culmen; bill barely tapering iS tip, .« . PQLEYSTICTA 
—much tapering to tip, . . HisTRIONICUS 
— extending on culm., and partly on sides of upper mand., . SOMATERIA 
—entirely on sides of up.mand., . LAMPRONETTA 
(C) Forehead ‘naked, with a large horny plate formed by extension of culmen, . . . . . . . FULICA 
63 
259 
258 
253 
253 
255 
254 
252 
257 
256 
264 
263 
270 
269 
—feathered; lores feathered; tail perfect; bill flattened, membranes scolloped, PHALAROPUS 200 
—subulate, membranes scolloped, . . Lowrpes 199 
—subulate, membranes plain, . . STEGANOPUS 198 
—naked; tail, none; forehead bristly; bill epignathous, - + « PODILYMBUS 315 
—soft; bill paragnathous. (q) 
(q) Tarsus =middle toe and claw. Birds 20 inches, or more, long,. .... . . . . ASCHMOPHORUS 312 
—< middle toe and claw. Birds from 12to19incheslong, ... .. . . . . . PODICEPS 313 
Birds under 12incheslong, ....... . . « SYLBEOCYCLUS 314 
(D) Middle claw pectinate ; 4t. 4-jointed; 1f. lateral; tail rounded; long rictal bristles, . ANTROSTOMUS 114 
— forked; short rictal bristles, . . CHORDEILES 115 
(D) Mid. claw not pectinate; head naked ; nostrils imperforate; naked leg and foot < tail, . MELEAGRIS 177 
— perforate; naked leg and foot < tail, . . CATHARTES 166 
— perforate; naked leg and foot> tail, . . . . GRUS 2 
— feathered; nostrils feathered, or overhung by a scale, in deep 
fossa of stout, hard bill. (r) 
— not feathered nor scaled, in long groove of 
“ slender softish bill. (s) 
(r) Toes feathered; tarsi and nasal fossz feathered. Plumage pure white in winter, . . . . LAGOPUS 
— naked ;—tarsi feathered, part way down; tail of 18 soft broad feathers, . . . . . . BONASA 
— to the toes; tail of —20 stiff acuminate feathers, . . . CENTROCERCUS 
— 20 or 16 soft broad feathers, . .. . . . TETRAO 
— 18 fthrs; neck with lanceolate feathers, CUPIDONIA 
— without such feathers, PEDIG2CETES 
— naked; tail nearly = wing; crest — slender, clubbed, recurved, . . LOPHORTYX 
— full, soft, depressed, . . . . . CALLIPEPLA 
— ito} the wing; crest — long, straight, filamentous, . . . OREORTYX 
— full, soft, depressed, ... . . CYRTONYX 
183 
182 
179 
178 
181 
180 
186 
187 
x 185 
188 
rx 184 
—rudimentary ornone, . ... .. . ORTYX 
(s) Trs. entirely reticulate; hind toe minute; bill straight, not>head,. . . . . . « « SQUATAROLA 
— scutellate in front only; bill much > hd. very slender. decurved, . . . . . ~ « . NUMENIUS 
— barely > hd., comparatively stout, straight,, . . HkTEROSCELUS 
— and behind; tl. not barred; one minute web; primaries mottled, TRYNGITES 
—2 plain webs; b.<, or about=hd., EREUNETES 
—much>hd., MICROPALAMA 
— tl. barred crosswise with light and dark colors. (8?) 
(s?) Gape not reaching beyond base of — furrowed culmen. Under a foot long, . MACRORHAMPHUS 
—unfurrowed culmen. Over a foot Ce Stee nt oe DALMLOS A 
(s?) Gape longer. Length <9 in.; 2t. unwebbed; bill grooved nearly to tip, . . . - - TRINGOIDES 
— about half-way to tip, RMaYACOPHILUS 
—>9in.; b. not >hd., grooved 3 its length; tl. about = 4 the wg., ACTITURUS 
—not=i the wing, PHILOMACHUS 
—> head; 2t. webbed: legs not green or yellow, SYMPHEMIA 
—hbarely or not webbed; legs green or yell., GLOTTIS 
189 
222 
221 
3 220 
206 
205 
204 
213 
217 
216 
219 
218 
214 
215 
