BIRDS— TURDIDAE—SIALIA. 221 
probability, is the same with that considered as peculiar to North America under the name of 
S. oenanthoides. The differences are, as far as indicated, merely those of size, the skin described 
by Mr. Cassin being 6.50 inches long ; the wing 4.12; the tail 3.00; the tarsus 1.25. This is, 
however, by no means an unusual discrepancy in birds of remote localities, and until better 
characters can be assigned there would seem little propriety in making two species. 
The Saaicola oenanthe of Europe is recognized as a regular inhabitant of Greenland, and 
those found on the main land of America in all probability reach it from that country. 
List of specimens. 
Locality. Whence obtained. | Len th | Wing. Tail. | Tarsus. | Middle | Its claw | Bill Along 
| toe. alone. | above. gape. 
| Soe ee aa i 
MUTOD Geese s sea) a OARS Nar= Some ats | 6.00 3.65 2.50 1.05 0.75 | 020 | 0.60 0.80 
SIALIA, Swainson. 
Sialia, Swainson, Zool. Jour. Ill, Sept. 1827, 173. (8. wilsonii.) 
Cu.—Bill short, stout, broader than high at the base, then compressed; slightly notched at tip. Rictus with short 
bristles. Tarsi not longer than the middle toe. Claws considerably curved. Wings much longer than the tail; the first 
primary spurious ; not one-fourth the longest. Tail moderate ; slightly forked. 
The species of this genus are all well marked, and adult males are easily distinguishable, In 
all, blue forms a prominent feature. : 
Above uniform dark blue ; beneath brownish red. Abdomen and crissum white....sialis. 
General color dark blue above and below ; crissum whitish. A broad patch on the 
scapular region (on either side) and on the sides of the breast, brownish red...meaicana. 
Everywhere greenish blue, becoming whitish on the abdomen and crissum ........ arctica. 
Comparative measurements of species. 
Catal. Species. | Locality. Sex. | Length.| Stretch | Wing | Tail. | Tarsus. | Middle |[ts claw Bill Along Specimen 
No. | of wings. toe. alone. above. | gape. | measured. 
| | 
1289 6516 Jina cease. 3.96 | 2.88 0.80 | 0.80 0.22 0.44 0.70 
do. G75) || 91 2"501l4208) |eceeae| heen oe |e oceatlacceree|esest ess cocteres 
1283 PP lEoadoe coon 3.78 | 2.72 0.0 0.82 0.21 0.50 0.76 
do. 6.50 UP ATU) S808 | bode. oo sorodo| lsseoo0d) pcpnpod iicapbosa|tbocercr 
3907 Hee cada coos 4.22 ao 0.80 |» 0.76 0.22 0.46 0.70 
3908 | 6.40 3.40 | 2.66 0.76 0.78 0,26 0.40 0.70 
3706 | Sialia macroptera, (Baird) ..” Salt Lake City...)...... MeLO Alles 4.78 | 3.18 0.86 0.82 0.18 0.50 0.80 
7604 | Sialia arctica ...... eeeeeees | Mimbres to Rio 6.28 |.. 4.46 | 3.04 0.87 0.76 0.22 0.53} 0.76 
| Grande. | | | | 
8890 GON oreresiscaes GG0G005 | Black Hills......] Q GE) |! con conoas 4.25 | 3.50] 0.78] 0.78| 0.62) 0.50] 0.74 | Dry*..... 
do. WO.. ceeeesceeeeeceeees [pe0009 dO..ceeeeee-|eceees 7.00 13.25 | 4,50 |ccces|ececeee| ceceverlerteecee seseeees|soeeene | Fresh... 
* Legs broken ; poor specimen, 
