Grundtvig on Warblers of Wisconsin. 
67 
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northerly wind again rising, appeared to partially check this vast 
throng ; but May 10, after another hard rain, I noticed them again 
moving slowly northward. The new species observed during 
this flight were Myiodioctes canadensis , Dendroeca striata , and 
Geothlypis trichas. The wind once more shifted to the south, 
and on the 18th I noticed a few new flocks, among which were 
some Dendroeca castanea. May 21 was the only day after the 
15th when the number of flocks exceeded those previously ob- 
served. The night of the 20th was exceedingly cold, freezing 
hard in many places ; in the morning, a very strong south wind 
was blowing, and Warblers in innumerable flocks began arriv- 
ing. Helniinthophila peregrina , previously seen but once 
(May 19), now arrived in large numbers. This immense 
flight soon ceased, and by May 26 only a few single Warblers 
were noticed. 
The number of Warblers that migrated over this route was 
simply astounding. Some of the more uncommon eastern spe- 
cies appeared here in large numbers. I found at the least estim- 
ate several hundred of Helminthophila celata , and to say I 
observed several thousand of Dendroeca tigrina would not be 
overstating it. This passage of the Warblers was really the most 
interesting of the kind I have ever witnessed. No bird migra- 
tions in Europe can be compared with it. The many pleasant 
hours spent in my boat, studying these graceful creatures, mani- 
fold both in species and beauty, will long be cherished among 
the many recollections of my sojourn in America. 
The following is my annotated list of all the Warblers observed, 
omitting the genus Siurus , members of which were never noticed 
in company with the other species. 
Mniotilta varia (Z.) V. May 1 two males were taken, not 
in flocks with other Warblers, but east of the Wolf River. 
Afterwards I found it usually associated with other Warblers, 
Kinglets or Titmice, but five were the most I ever counted in any 
one flock. A few remained to breed. The first female was taken 
May 10. 
Farula americana (Z.) Bp. May 3 two females were 
taken. The next morning a few others of both sexes appeared 
in the other flocks, no more than three being noticed together ; 
but in the afternoon they were quite numerous. May’ 5 I noticed 
these Warblers in small flocks by themselves, but during the next 
few days they were rather scarce. Between the 12th and the 
