16 Trans. Acad. Sci. of St. Louis 
fact. Such must also be true of much of New England, 
of Pennsylvania, Maryland and West Virginia. 
(2) Wherever agriculture or farming is practiced, 
there the Prairie Horned Lark will find suitable breeding 
quarters in the gardens, on the plowings, in the closely- 
grazed pastures. 
(3) The Prairie Horned Lark is possessed of a remark- 
able versatility in the rapid adoption of new breeding 
areas, as will be shown later in the study of the bird at 
Evanston, IIl. 
(4) The keen observation of McIlwraith (see above), 
who gives within a year the date of the appearance of a 
new Lark into Ontario in a region that he had carefully 
worked several years prior to this time, is one of the 
best evidences of the extension of range. Furthermore, 
his observations were made before Henshaw erected the 
subspecies. 
(5) The first New York records, made shortly after the 
observations of Mcllwraith, were, in some cases, in a 
region that had long been studied ornithologically. And 
these were made before the publication of Henshaw’s 
paper. 
(6) The July record of 1869 in Maynard’s Guide (see 
above), if it actually represented a breeding bird, may 
well have represented one of the early adventures of the 
Lark, a pioneer, who was followed by numerous settlers 
twenty to thirty years later. 
(7) The orderly sequence of records from Ontario to 
eastern Massachusetts, from New York to West Virginia, 
after ornithologists everywhere were on the lookout for 
Otocoris alpestris praticola, is in itself the best evidence of 
the routes undertaken. 
Forbush (1927) stoutly defends the idea of the eastward 
movement and increase of the Prairie Horned Lark. He gives 
as a probable reason for this extension “the fact that much 
of the prairie land in which it formerly bred has been settled 
and cultivated, and tree claims have been planted with trees, 
thus driving out the species from thousands of square miles 
in the aggregate (now wooded) in which it formerly bred.” 
