18 U. S. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
The young male of A. Cooperi may be mistaken for the young female of the present bird, The 
three American species of Accipiter, however, may be said to be so much alike in color as to 
almost represent different sizes of one species. It is a group in which size is a specific character. 
List of specimens. 
Measurements. 
3 3 
5 . Locality. When collected. | Whence and how = Remarks. Collected by— Oe 
B Sp obtained. = BE 
= S 8 ceo 
Se I a5 
ra & “Eb 2 
§ * = 5 
o | a fo) e 
SIGS) |... 00s. Mouth of Yellow Stone river. .... Aug. 18, 1856,....] Lieut. Warren... .aslcccece|ecscecciceecesens Dr. Hayden....|ecescslevcees|eeeves 
5164 |....../ Mouth of White Earth river.......| Sept. 6, 1856. ....)...5 sO siisleins!srite'sisls\| estsroin') Tris light yellow ...... OO sistelsteis's| stoeisiacs 30.25] 10.25 
5163 Fort Berthold, Nebraska,......5.. Sept. 16, 1856....|-.0000. On as vesewcceliscuces|ececes dO. en vectellecjecisie Ocgasscine 17.00) 29.25} 9.00 
5579) lleieces = | Bridger’s Pass, Nebraska ......... | Aug. 14, 1856..... | Lieut. Bryan. .. 
6849 |.....- Fort, Thorn; News MexicOe)scsisjeeie| «sissies seleeiceiss seis 
5841 |. .cces | Puget?s Sound) WieDesccccceveses Oct. 4, 1856...... 
5846 |.eeee Port Townsend, W.'T....00s000. Aug., 1856....... 
5847 | «eee Fort Steilacoom, W. T .. Sept., 1856....... 
4590 | cocess|sesccccces (DO ssietelaraiaiasucnnfetslaleloehijetaca|llsialtistercisiere sictalsieis siete : . seer lee 
6848 |...... Bodega, California. ........., 00+. Feb., 1855. . .| Lieut. Trowbridge.|... 2a) “DJA Szabo}....i ce 
6874 | | sacramento Malley; [Californias sta n|)sir<eisiteleec'esiei's sles MAeutsWVAlliam sored l(c csiseiel|caice cielseeisieieieee Dr. Heermann.}...... Wecicaas| Keees5 
ACCIPITER FUSCUS, Gmelin. 
Sharp-eshinned Hawk. 
Falco fuscus et dubius, Gm. Syst. Nat. I, 280, 281, (1788.) 
Accipiter striatus, Vir. Ois. d’Am. Sept. I, 42, (1807.) 
Falco velox et pennsylvanicus, Witson Am. Orn. V, 116, and VI, p. 13, (1812.) 
Sparvius lineatus, Virmtt. Ency. Meth. III, 1266, (1823.) 
Nisus Malfini, Lesson. Traite d’Orn. I, 58, (1831.) 
Ficures.—Temm. pl. col. 67; Vieill. Ois. d’Am. Sept. pl. 14; Wilson Am. Orn. V, pl. 45, fig. 1, and VI, pl. 46, fig. 1; 
Aud. B. of Amer. pl. 374, Oct. ed. I, pl. 25. 
Adult.—Small, tail rather long ; legs and toes slender ; entire upper parts brownish black, tinged with ashy; occiput mixed 
with white ; throat and under tail coverts white, the former with lines of black on the shafts of the feathers ; other under parts 
fine light rufous, deepest on the tibie, and with transverse bands of white ; shafts of the feathers with lines of dark brown; tail 
ashy brown, tipped with white, and with about four bands of brownish black ; quills brownish black, with bands of a darker shade, 
and of white on their inner webs; secondaries and tertiaries with large partially concealed spots of white. 
Young.—Entire upper parts dull umber brown, tinged with ashy; neck behind mixed with white ; greater wing coverts and 
shorter quills, with large partially concealed spots of white ; under parts white, with longitudinal stripes and circular and ovate 
spots of reddish brown, changing into transverse bands on the flanks and tibie ; under tail coverts white ; bill dark bluish horn- 
color ; cere and tarsi yellow. 
Total length, female, 12 to 14 inches ; wing 7} to 8, tail 6} to 7 inches. Male, 10 to 11 inches ; wing 6 to 63, tail 5 to 53 inches. 
Hab.—Throughout North America and Mexico. Spec. in Nat. Mus. Washington and Mus. Acad. Philadelphia. 
Apparently, this handsome little hawk inhabits the whole of North America, from Mexico to 
the confines of the frigid zone. Numerous specimens, from various localities, are in the collec- 
tions of the expeditions. 
This little hawk, when in adult plumage, much resembles Accipiter nisus of Europe ; but the 
young are quite different, as is the case with nearly all the species of this family inhabiting 
North America, which resemble species of the Old World. 
