BIRDS — ti;kuiuai: — si alia. 



2-21 



probability, is the same with that considered as peculiar to North America under the name of 

 S. oenanlhoide-i. The diflereuces are, as far as indicated, merely those of size, the skin described 

 by Mr. Cassin being (l.oO inches long ; the wing 4.12 ; the tail 3.00 ; the tarsus 1.25. This is, 

 however, by no means an unusual discrepancy in liirds of remote localities, and until better 

 characters can be assigned there would seem little propriety in making two species. 



The Saxicola oenanthe of Europe is recognized as a regular inhabitant of Greenland, and 

 those ibund on the main land of America in all probability reach it from that country. 



List of specimens. 



SIALIA, S w a i n s o 11 . 



Sialia, Swainsok, Zool. Jour. Ill, Sept. 1827, 173. (S. tcitsonii.) 



Cii. — Bill ehort, Btoul, broader than high at the base, then compressed ; sliclitly notched at tlji. Rictus witli short 

 bristles. Tarsi not longer than the middle too. Claws considerably curved. Wings much longer than the tail ; the first 

 primary spurious ; not one-fourtli 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.... siaKs. 



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. ..viexicana. 



EveryAvhere greenish blue, becoming whitish on the abdomen and crissum arciica. 



Comparative measurements of species. 



Catal. 



No. I 



1389 

 do. 



1383 

 do. 



3907 

 3908 

 3706 

 7604 



8890 

 do. 



Species. 



Locality. 



Sialia ^ialis Carlisle, Fenn.. 



do dn 



.do. 



,(lo.. 



do do 



Sialia mcxicana California 



do do 



Sialia macroptcra, (Baird) .. Salt Lake City. .. 



Sialia arciica Mimbrci to Rio 



Grande. 



do ni.ick Hills 



do do 



Length. 



6.16 

 6.75 

 6.22 

 6. SO 

 6.44 

 6.40 

 7.16 

 6.26 



6.80 

 7.00 



Stretch 

 of wings. 



12.50 



13.00 



13.2.-) 



Wing 



2.88 



2.72 



2.80 

 2.66 

 3.18 

 3.04 



Tarsus. 



0.80 

 O.tO 



0.80 

 0.76 

 0.86 

 0.87 



0.78 



Middle :its cinw Bill 

 toe. ' alofic. above. 



0.80 0.22 0.44 



0.82 I 0.21 



0.76 

 0.78 

 0.82 

 0.76 



0.22 0.46 



0.26 I 0.40 



0.18 0.5U 



0.22 0.53 



0.78 0..a 0.50 



Along 

 gape. 



0.76 



Specimen 

 measured. 



Dr)-.... 

 Fresh.. 

 Dry. . . . 

 Fresh . 



Dry 



Dry.... 



80 ' Dry.. 

 76 I Dry.. 



1.74 1 Dry'... 



.... Fresh . 



* Legs broken ; poor specimen. 



