Reproduction 67 
it has been carried eastward and northward with the recent 
extension of range into regions where it is obviously a greater 
incongruity than in the earlier home. For even in northern 
Illinois March nests are far more successful than in south central 
New York and the discrepancy would be greater between east- 
ern Kansas and Manitoba. The question, at this time, must 
rest here with the conclusion that the origin of March nestings 
is not fully known but may have been developed as species- 
TABLE 2 
Hypothetical March er of the Prairie Horned Lark with the hn 
ultimate success or failure with regard to snow, in the Ithaca, N. Y., 
for the years 1916 to 1927, 
Year Possible* Nesting Pe npr iroend cee tigen an | Result of March 
Periods in March ie oo to Ground at 8 P.M. Nesting 
1916 25 to 31 None Successful 
1917 23 to 31 None Successful 
1918 |12to14and 17 to 22| April 9 to13....... 10 in. April 12.....| Failure 
1919 | 17 to 18 and 25 to 26| March 27 to April1.| 5in. March 28 to 29| Failure 
1920 22 to 31 None Successful 
te { — eh ee } None Successful 
1922 13 to 15 March 30 to 31.....] 2 in. March 30....| Successful? 
1923 21 to 23 None Successful 
1924 28 to 30 April} to 8.20.5. 7 in. April 2... Failure 
— { =a e ay st } March 28 to 29.....| 2.5 in. March 29...| Successful? 
1926 None _— nape! Dr tn “ak penal = degree|s F. and snow on 
1927 11 to 14,18 to 19 | Aprill to3........ 4m; April 1... << Failure 
*Not less than two days ce a mean temperature above 40 degrees F. 
NOTE: All dates are inclusi 
Sum: 
: Numbe si ears considered: 1 
Ni woe oe of years c in which Maren — _— possible: 11 
necessity in some earlier home where such nests were sufficiently 
successful to have been maintained ; and now such nestings have 
been carried to regions where they may, eventually, be elimi- 
nated through natural selection. 
Finally, before leaving this fascinating subject, it should be 
noted that praticola seems to be unique among all the Horned 
