26 Trans. Acad. Sci. of St. Louis 
(1923) says that it ‘‘reaches us in late February or early 
arch . . . . leaves about November 10,’ in Wellington and 
Waterloo Counties, Ontario. Barrows (1912) writes that it is 
ordinarily entirely absent from the state (Michigan) during 
December and January. Finally Criddle (1922) gives the fol- 
lowing dates for Aweme, Manitoba, the most extensive observa- 
tions, apparently, ever made of the migration of this subspecies: 
Spring migration (Aweme, Manitoba) 
Number of years Average first date Earliest 
25 Feb. 21 Feb. 9, 1918 
Fall migration (Aweme, Manitoba) 
Number of years Average date last observed Latest 
24 1 Nov. 23, 1917 
Summary of general migration—The Prairie Horned Lark 
is not extensively migratory, belonging, in the categories of 
migration, between a form such as O. a. alpestris which moves 
entirely from its summer home for a long period and the almost 
sedentary species such as O. a. giraudi which is said to be found 
throughout its breeding range during the entire year. The 
southern limit of the winter range of praticola is South Carolina 
(occasional in Georgia), and Texas, and at this limit the bird 
oceurs in December and January. Many spend these two months 
also in Kansas, Oklahoma, very probably in Missouri and in 
Kentucky. From middle to late November into late January 
or early February Otocoris alpestris praticola is absent from 
New England (Vermont, Parkhill, 1889), New York, Quebec, 
Ontario, Michigan, Indiana (Butler, 1897, who says December 
first to January twenty-fifth usually) and Manitoba. The situa- 
tion is, undoubtedly, the same for all other territories, of similar 
latitude, where the Prairie Horned Lark breeds. 
tion of sexes and individuals—But little can be said 
at this time, as to the arrival of sexes, of mature and immature 
birds and of resident and non-resident individuals in any given 
locality. If all these forms were characterized by diverse plum- 
age as the Red-winged Blackbird (see Allen’s, 1911-13, most 
excellent account of the migration of this form), the problem 
would have greater possibilities of solution. But since mature 
and immature birds in spring have no distinguishing charac- 
teristics in the field, and since sexes can be distinguished only 
