224 U. S P. R. R. EXP. AND SURVEYS—ZOOLOGY— GENERAL REPORT. 
List of specimens. 
Catal.) Sex. Locality. When collected.| Whence obtained. | Orig?! Collected by— |Length.| Stretch} Wing. | Remarks. 
No. | | No. of wings. | 
7618 | G | Fort Steilacoom, W. T...| April 17, 1856 | Dr. Suckley ....c.e|seseeslecccce voce 
EQUI Eos ieeee ste (i hoonorsdiGocodonadd loduddananancages Gov. Stevens Dr. Suckley.. 
7622'] Gi |aveees dO .cereeesccccvccccs|ec-cocccce ceves[esseesAQrecvccsccess| 77 |eocees do. 
F625 | ceecc.|eccece GOve cccvcic cece cocene | seeeee 
T7636 | cccce|sccece O.. veccscccnccccses|coccccrccsscsseclecsscsccccccescesess| 213 |scee veccsrecvcccess 
7634 | 2.00. Fort Vancouver, W. T.. Dr. Cooper’... ..-- 
1930 | G | Columbia river, 0. T.... | | J. K. Townsend....|-.. 
2949 Q eeeeee GO. sccccccceesccccee 
5512} © | Petaluma, Cal.. ........ 
BEN) KO) Neconne (il po acpco9e50 060000 | 
3907} G | California .......... : 
SSO] OM Posse: DOs osiscs siocesievavids | 
5944 |.eeeee Santa Clara, Cal...... a] INOVs5 1850 se00c!) Dre COOPEX sc cts ve.c-|| sce csec|cnseleclesiexiuececsjscis 
4220 | reece. San Francisco........... |Winter of 55 & *6; R. D. Cutts...-.... |eeeee 4 
7632 | © | Sacramento Valley....... 
7631 | G | Tejon valley, Cal......... 
4575 |coeeee Gila river, New Mexico.. 
F633 |+eeees|scceee dO... ccccesscevicccees 
5051 |+.+-..| Fort Fillmore, N. Mexico.| Oct. 21, 1855 | Captain Pope.. al | : 5 3 Bill and eye 
. | black; gums 
yellowish. 
7623 |-eee- Mimbres to Rio Grande ..|...sseeeeeseeees Dr. Henry .....ccccleveces|cocccccoce sialoe’siofore e’s||(esiejalelo(n's|| (miuleela‘erera||(sloletole's'ersll (s(ainialm slelsintstaicteleista 
5050 [esses Organ Mts., New Mexico,| Mar. 9, 1856 | Captain Pope...... | 178 | ecceccccccccceccees 7.00 13.00 4,25 | Bill, feet, and 
: eyes black; 
gums bluish. 
7624 |ooees.| Near 32° latitude.....cccclecccce cccccccre-|cccceedOcscccccccccs|ccccse|socvvcvcrcvccecce ov leeescces| cossvcre|scssecas(cceceesees evens 
7637 Eyes black..... 
7638 a cccerelcccc cece ceccccccces|-ccccces| cess cee: |cecccces|ssssaces eves cece 
T635\|\es\es\c'0 Fort Conrad, New Mexico.| Oct.,1853......} Lieut. Whipple....| 52 | Dr. Kennerly ...se-|ecceeecs|seeesees| .75 |ecece eleelclelesisiejee 
4020} Q Saltillo, Mexico.......... May, 1853..... Lieut. Couch...... | Bill & ft. black. 
SIALIA ARCTICA, Swainson. 
Rocky Mountain Blue Bird. 
Erythraca (Sialia) arctica, Swainson, F’. Bor. Amer. II, 1831, 209; pl. xxxix. 
Erythraca arctica, Ricu. List, 137. 
Sialia arctica, Nurraut, Man. II, 1832, 573 ; I, 2d ed., 1840, 514.—Bonap. List, 1838.—Avp. Synopsis, 1839, 84.— 
Is. Birds Amer. II, 1841, 178; pl. 136.—McCatt, Pr, A. N. Sc. V, June, 1851, 215. 
Sylvia arctica, AupuBon, Orn. Biog. V, 1839, 38 ; pl. 373. 
Sialia macroptera, Bairp, Stansbury Report Exp. Salt Lake, 1852, 314. 
. 
Spr. Cu.—Azure blue above and below, brightest above ; the belly and under tail coverts white: the latter tinged with blue 
at the ends. Female showing blue only on the rump, wings, and tail; a white ring round the eye; the lores and sometimes a 
narrow front whitish ; elsewhere replaced by brown. Length, 6.25; wing, 4.36; tail, 3.00. (1875.) e 
Hab.—High dry central plains ; Upper Missguri Rocky mountains range and south to Mexico. Rare on the coast of 
California. 
In this species there is none of the reddish brown of the two other American blue birds, the 
color throughout being blue, except as mentioned. The shade of blue is much lighter, with 
more green in it, or smalts-color, especially on the crown, instead of the purplish blue of the 
others. The shade on the under parts is paler than above ; it extends entirely along the sides 
and to the abdomen. r 
The female has the abdomen and under coverts like the male; the remaining under parts, 
with the head, neck and back, are light brown, although a bluish shade is appreciable on 
