232 
APPENDIX. 
154. Otus brachyotus, / 3 . cassini, (Brewer.) American Short-eared owl. a, 
b, adults. 
155. Otus wilsonianus, (Less.) American Long-eared Owl. a, b, adults; 
c, d, pullus. 
156. Scops asio, 0. maxwelliae, (Ridgw.) Mrs. Maxwell’s Owl. a, rf ad. ; 
b, 9 ad. ; c, d, pullus. [See description at end of catalogue.] 
157. Scops flammeola, (Licht.) Flammulated Owl. a, adult. [Boulder, 
Col., March. Iris umber brown /] 
158. Nyctale acadica, (Gm.) Saw-whet Owl. a, adult ; b, c, juv. 
159. Glaucidium gnoma, (Wagl.) Pigmy owl. a, <$ ad. ; b, 9 ad. 
160. Speotyto cunicularia, y. hypogaea, (Bonap.) North American Burrow- 
ing Owl. a, c? ad. ; b, 9 ad. ; c, d, pullus. 
Family FALCONIDHE: Falcons, 
Kites, Hawks and Eagles. 
161. Falco saker, y. polyagrus, (Cass.) Prairie Falcon, a, “ 9 ”’ ad. ; b, 
“c?” juv- (2ndyr.); c,“9” juv. (2nd yr.) 
162. Falco richardsoni, (Ridgw.) Richardson’s Merlin, a, 9 (? ad.) 
163. Falco sparverius, (Linn.) American Kestril. a, cf ad. ; b, 9 juv. 
164. Pandion halisetus, / 3 . carolinensis, (Gm.) American Osprey, a, b, juv. 
165. Circus hudsonius, (Linn.) Marsh Hawk, a, <J* ad.; b, 9 juv. 
166. Nisus cooperi, (Bonap.) Cooper’s Hawk, a, cf juv. ; b, 9 juv. 
167. Nisus fuscus, (Gm.) Sharp Skinned Hawk, a, (J juv. ; b, 9 juv. 
168. Astur artricapillus, (Wils.) American Gos-hawk. a, ad.; b, 9 ad. ; 
c, juv. ; d, e, pullus. 
169. Buteo borealis, j8. calurus, (Cass.) Western Red-tailed Buzzard, a, b, 
ad. ; c, d, juv. 
170. Buteo swainsoni, (Bonap.) Swainson’s Buzzard, a, ad. ; b, 9 ad. ; 
c, 9 juv. 
1 71. Archibuteo lagopus, j 3 . sancti-johannis, (Gmel.) American Rough- 
legged Buzzard, a, ad. ; b, c, juv. 
172. Archibuteo ferrugineus, (Licht.) Ferruginous Rough-legged Buzzard; 
“ California Squirrel Hawk.” a, ad. : melanistic [See description, 
on page 212] ; b, 9 ad. ; c, d, pullus. 
173. Aquila chrysastos, j 3 canadensis, (Linn.) American Golden Eagle, a, 
ad. ; b, juv., in 2nd or 3rd year ; c., juv. in 1st year. 
174. Haliaetus leucocephalus, (Linn.) Bald Eagle, a, ad. 
Family CATHARTIDzE: American Vultures. 
175. Rhinogryphus aura, (Linn.) Turkey Vulture, a, ad. 
Family LARID^E: Jaegers, Gulls, and Terns. 
176. Stercorarius parasiticus, (Brunn.) Parasitic Jaeger, a, juv. [Boulder; 
December.] 
177. Rissa tridactyla, (Linn.) Kittiwake Gull, winter pi. [Boulder; 
December. ] 
178. Xema sabinii, (Prev. et des Murs.) Sabine's Gull, a, juv. [Boulder; 
December.] 
179. Chroecocephalus Philadelphia, (Ord.) Bonaparte’s Gull, a, juv., transi- 
tion pi. 
180. Larus delawarensis, (Ord.) Ring-billed Gull, a, adult ; b, juv., transit 
tion pi. ; c, juv., first yr. 
Family CHARADRIID^E : Plovers. 
181. Sqnatarola helvetica, (Linn.) Black-bellied Plover, a, juv. 
182. Egialitis montanus, (Towns.) Mountain Plover, a, ad.; b, 9.' c > 
pullus. 
183. Egialitis vociferus, (Linn.) Killdeer Plover, a, b, adult; c, d, pullus. 
