116 Bulletin Wisconsin Natural History Society [Vol. 11, No. 4 
Larus marinus Linnaeus. Great Black-Backed Gull 
A rare migrant, seen most frequently about Golden Lake, from 
which region Mr. C. A. Koch reports having caught one with 
an injured wing a few years ago. The birds are for the most part 
solitary, and rarely more than two individuals are seen together. 
Larus argentatus Pontoppidan. Herring Gull 
A common resident, seen sparingly during the summer and 
winter months, but more commonly in the spring and fall. Several 
immature birds were seen during the entire summer of 1912 in 
the vicinity of Pewaukee Lake. 
Larus delawarensis Ord. Ring-Billed Gull 
A regular migrant, though occasionally seen during the sum- 
mer. More abundant than is generally believed. 
Larus Philadelphia (Ord). Bonaparte’s Gull 
A regular, though hardly an abundant spring and fall migrant, 
usually arriving in very large flocks. One mature and one im- 
mature individual were seen on Dutchman’s Lake on August 28, 
1912. 
* 
Sterna hirundo Linnaeus. Common Tern 
An abundant spring and fall migrant. The fall migration begins 
about the middle of August, and after the first of September the 
birds may be seen over almost any of the larger lakes. Usually 
in flocks of eight to fifteen. 
Hydrochelidon nigra surinamensis (Gmelin). Black Tern 
A common summer resident on certain lakes only. About ten 
pairs nest yearly in the rushes at the north end of Golden Lake, 
where they may be seen until well into September. The colony, 
although undisturbed, does not show appreciable increase in 
numbers. This is a very gentle bird, which will follow a fishing 
boat for hours, picking up every dead minnow available. Black 
plumaged birds are rare after the middle of August, although one 
was seen August 27, 1913. 
Mergus americanus Cassin. Merganser 
A common early spring and late fall migrant, rarely seen after 
April or before November. The commonest of the “fish-ducks” 
during the early part of April. 
