MICHIGAN ACADEMY OF SCIENCE. 
153 
On account of the scattered nature of these records, the liability of 
their being lost and their present inaccessability to students, I have 
been instructed by Mr. Chas. C. Adams, the Curator, to prepare in 
tabulated form the following records, and I am indebted to him for 
many suggestions in their preparation. The nomenclature, and numbers 
in parenthesis are those of the A. O. U. Check List. In the first column 
of the following tabulation is given the earliest recorded date of arrival, 
in the second, the average date of arrival for each species, and in the 
following columns the earliest date for each consecutive year. 
This list includes all the species observed in this vicinity, and the 
number of records for each species shows whether it is common or rare. 
The lack of data for the water birds is owing to the fact that very- 
little work has been done in the interlobate lake area, which region 
affords the best opportunity for securing such records. 
The occurrence of the following species not included in the list, should 
be considered hypothetical: Brewster’s Warbler is placed here as it is 
thought to be a hybrid. The Labrador Duck is also, placed in this list. 
The following species are placed in the doubtful list: Little Blue 
Heron, Richardson’s Merlin, Hoary Redpoll, Smith’s Longspur, Blue 
Grosbeak, Hooded Warbler, Kentucky Warbler, White-eyed Yireo, 
Belted Piping Plover, Hudsonian Curlew, and Sabine’s Gull. 
The method of determining the average dates of arrivals is as follows: 
I. For species having a wide range of dates, the week including the 
greatest number of records was chosen, thus: March, second week. 
II. For species whose range of dates is limited, though variable, the 
average date is given as: April 5 a. 
III. For the few species which have arrived at a definite date, the 
exact record is given, as: May 5. 
GENERAL REMARKS. 
The Table of First Arrivals is placed at the end of this paper and is 
a record of all first arrivals from 1880 to 1905 inclusive. 
In addition to the Table of First Arrivals two other tabulations have 
been prepared to show further details of the spring migration. One 
is a Table of Migration Waves, to show for each week the dates and 
number of species occurring in ertch wave, and the number of species 
arriving during each week. The second is a Table of Species Occurring 
on more than one Wave, and is intended to show the number of waves 
for each week and the number of dates of first arrivals for each species 
during the twenty-five years. Although but a very rough estimate, 
when more than three species have arrived on the same date, this has 
been considered a wave. For the exact date of arrival the Table of First 
Arrivals should be consulted. 
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