— > 
ser =~ Oe 
7 « 
KEY TO THE GENERA. 65 
(y) Nostrils at edge of the cere; eyes anterior, surrounded by radiating feathers, the anterior of which are 
bristly and hide the base of the bill; outer anterior toe shorter than inner anterior toe. (y1) 
y) Nostrils im the cere; eyes lateral, not surrounded by a disc; outer anterior toe (generally) not shorter 
than inner anterior toe. (y?) 
(y1) Trs. naked or scant-feathered. Facial disc perfect; 3cl. somewhat pectinate,. . . . . . . STRIX 139 
—imperfect; 3cl. simple; trs.>3tcl, . . . . SPEOTYTO 150 
—<3tel, . . . MICRATHENE 149 
—full-feathered; head tufted; tail about }the wing. OverlS8incheslong, ... .. . . BuBOo 140 
—jthe wing. Underl2incheslong, ... .. . . Scors 141 
— Over 12, under 18; tufts— of 8 to 12 fthrs., . Orus 142 
—of 3 to 6 fthrs., BRACHYOTUS 143 
—not tufted; tail about 4 the wing. Length under 12inches, . . . NYCTALE 147 
—jthewg. Lgth.18o0rmore. Pure wht., spotted, NYCTEA 145 
— Not pure white, SyRNIUM 144 
—j the wg. Length over 12, under 18 inches, . SURNIA 146 
Length mueh under 12, . . . GLAUCIDIUM 148 
(y?) Trs. feathered to the toes—all around; taila foot or more long, . . «os cme) at) A OUIGAN TOS 
—except a narrow strip behind: tail nota foot lone . . ». ARCHIBUTEO 160 
—reticulate— upper mandible toothed, under mandible notched, nostrils circular, . . FALco 158 
—Claws all of same length, rounded undernéath; tibial feathers close, . . PANDION 162 
— Tail emarginate, and outer feathers not longer than middle, . . . . . EDLANuS 154 
— forked, outer feather about twice as long as middle, . . . . . NAUCLERUS 155 
—scutellate in front; no web at base of toes; tailafootormorelong, ... . . . HALLETUS 164 
—a web; nostrils circular; tailnot }aslongas wing, . .. . . . IcTINtA 153 
—ovyal; billnot 4 as deep at base as long, . . ROSTRHAMUS 152 
— oval; tarsus feathered about 4 way down in front, ASTUR 157 
—hardly ; way down, . . ACCIPITER 156 
—and behind — Tibial feathers not reaching below the joint, . . . . . ONYCHOTES 161 
— Bill yellowish; nost. linear, oblique, near up. edge of cere, POLYBORUS 165 
—Face with a ruff; trs. twice 3t.; up. tail-coverts white, . . . Circus 151 
— Hawks without these characters, ....... . . . . BUTEO 159 
(Z) PRIMARIES, —10; the Ist (never spurious) always more than | as long as the longest. (a) 
(Z) PRIMARIES, —10; the Ist (spurious or) at most not % as long as the longest. (b) 
(Z) PRIMARIES,— 9; the lst (never spurious) of variable length. (e) 
(a) Feet syndactylous ; bill serrate: middle tail feathers long-exserted, . . . . . . . . . » Momorus 112 
—not serrate, middle tail feathers not exserted, . . . jee) CRRYER IS 
(a) Feet normal ; tail of 10 feathers; more than 6 secondaries ; trs. feathered; 4t. 3-jointed, » PANYPTILA 116 
—naked; tailnotspiny, . NEPHC@CETES 117 
—spiny, . . CH®TURA 118 
—only 6 secondaries ; bill subulate,=or>head. (a?) 
(a?) Trs. feathered. Grass-green, head striped with black and white, .... . . . HELIOP®DICA 119 
—naked; b. serrate, twice=head. Black below, throatnot scaly, ... . . . . . LAMPORNIS 120 
—not serrate; Ist primary rigid; tailtruncate. Green, .. » »« « . STELLULA 123 
—notrigid; attenuate; or—rufous on sides; or crown scaly, SELASPHORUS 122 
—not attenuate; norufous; throat green, . ARGYRTRIA 124 
—not green, . . TROCHILUS 121 
(a) Feet normal; tail of 12 feathers: 1st primary —attenuate; tail>wings, forficate, . . . . MILvuLUs 104 
—not>wings: forked or not, TYRANNUS 105 
—not attenuate; crown plain, or full-crested. (a*) 
(a®) Tail =or little < wing, not forked, edged with chestnut; trs.=or>3tcl., . MYIARCHUS 106 
—slightly or not forked; not edged: trs.>3tcl.,. . . SAYORNIS 107 
— much < wing., a little forked; trs.<3tcel. Length 6} or more. . . . CONTOPUS 108 
—<or nearly =we., barely or not forked: trs.=or>3tcl. Length 6} in. or less. (a4) 
(at) Colors greenish, olive, etc.; no buff, red or pure brown, . . EMPIDONAX 109 
— brownish olive, etc.; buffy below. Subcrested, . MirrerPHoRuS 110 
— fiery (or rosy) red, and deep brown; ¢ full-crested, PyYROCEPHALUS 111 
(b) Tarsus * booted ;” wings < tail, both much rounded; plumage remarkably lax, . .. . . CHAM@A 11 
wings > tail; nostrils linear; no rictal bristles; plumage close. Aquatic, CINCLUS 7 
—not linear: taildouble-rounded, ... . . . . MYIADESTES 52 
—not double-rounded. Under5in.long, RrEGuLUS 9 
Over din. long. (b?) 
(b?) Tarsus not>mid. toe andclaw. Bluethe chief color, . . oy et SEATS 0G 
—>mid. toe andclaw. Noblue, Tail only 3 the ies - SAXICOLA 5 
—morethan ?thewing, TuRDUS 1 
(b) Tursus scutellate; nostrils covered with tufts of antrorse bristly feathers. (c) 
—nostrils exposed; base of bill with few such feathers, or none. (d) 
KEY TO N. A. BIRDS. 9 
