6G The Wilson Bulletin — No. 67. 



on both sides of the lake and among the islands any discus- 

 sion of the routes taken by the birds in their southward move- 

 ments is too academic to be profitable. I hope that in the; 

 next few years some fairly extensive and complete work of 

 this kind may be accomplished and the question settled. 



The writer is painfully aware of the shortcomings of this 

 list, but he feels sure that it is wiser to publish it now than to 

 wait until comparisons with the list by Taverner and Swales 

 for Point Pe.elee would lose value by reason of so great dis- 

 crepancies in the time covered by the work at the two places. 

 This list should be regarded as preliminary. 



1. Colyinhiis aiiriti(f<. — Horned Grebe. 



An irre.Linlar and not often common spring migrant, but usually an 

 abundant fall migrant, when it is found in large companies in the 

 shallow water between the shore and the outer bar on the lake. 

 Relatively few individuals are ever found on the waters of the Bay 

 at any time. Its earliest date of arrival in spring was March 25, 

 the median date being April 16 ; the median date of departure for 

 seven years is April 21, the latest date being May 17, 1908. The me- 

 dian date of arrival in fall is October 10, the earliest date being Sep- 

 tember 23, 1907. It usually remains, but in small numbers, until 

 the first severe weather — December 27, 1907. Scattered individuals 

 are fovmd on small inland waters, and on the streams. Occasionally 

 exhausted and starving individuals are found in mid-wintfer in towns 

 or cities. 



When the numbers are so great that large companies are formed 

 there is a perpetual conversational undertone decidedly pleasing in 

 quality, accompanied with a sort of play among the birds. There is 

 usually little concerted action, whether resulting from sudden fright 

 or otherwise, but I have seen a flock of nearly 200 individuals dive 

 almost on the instant. 



2. PodiJyml)us podiceps. — Pied-billed Grebe. 



A regular and fairly common migrant, but never in such numbers 

 as the last species. A few remain all summer in the marshes and 

 very likely breed there, but I have not yet found birds with their 

 young. At Cedar Point it is just as clearly a bird of the marshes 

 as the last species is of the open lake. Occasionally individuals are 

 seen on the lake side of the sand spit, especially late in the spring 

 migration. The maximum number of individuals forming a company 

 seldom exceeds a dozen, and from two or one t© four or five is far 



