MUSEUM OF COMPARATIVE ZOOLOGY. 173 



LARID.2E. 



133. Larus delawarensis. Abundant. Has the singular habit of 

 feeding on grasshoppers, which it captures in the air. Breeds in large 

 numbers on the islands. 



134. Chroecocephalus Philadelphia. First seen about October 1st. 

 Three specimens were taken, which differ from average eastern examples 

 in having a much shorter, relatively thicker, and less decurved bill. The 

 difference is so great as to be quite striking. 



135. Xema Sabini. A single specimen was taken September 28th, 

 the only one seen. 



PODICTPIDJE. 



136. Podiceps cornutus. One specimen taken. Perhaps common. 



137. Fodilymbus podiceps. Common. 



IX. Summary List of Birds observed in Kansas, Colorado, Wyoming, 

 and Utah, in 1871. 



The preceding lists being more especially a record of observations 

 respecting the character of the avian fauna of particular localities, the 

 following general summary is appended to show at a glance the area 

 over which the different species were respectively met with, and to 

 indicate the vertical range of those observed in the mountains of 

 Colorado. It is to be understood that the species are summer resi- 

 dents at the localities named, unless otherwise stated. Some were seen 

 only during migration, and unless known to breed at the localities 

 where they were observed, the season of observation is stated. The 

 altitudes given are of course only approximate, though believed to be 

 in the main correct. The list has some negative value, as it is proba- 

 ble that at most of the localities cited few, if any, other species were 

 characteristically common. 



TURDID-S3. 



1. Turdus mustelinus. Eastern Kansas. 



2. Turdus Pallasi. Topeka, Kansas (one specimen) ; mountains of 

 Colorado, from about 8,000 feet to timber line ; Ogden, Utah. 



3. Turdus Swainsoni. Eastern Kansas (May). 



4. Turdus fuscescens. Mountains of Colorado, up to about 8,500 

 feet. 



5. Turdus migratorius. Eastern Kansas (rare) ; mountains of Col- 

 orado up to timber line ; Ogden, Utah. 



