GAMBEL'S WHITE-CROWNED SPARROW 1333 



to be in the early part of the arrival period. The average of 19 inter- 

 vals between influxes is 6.0 days. The most commonly occurring 

 interval (6 of the 19) is 5 days. 



The period elapsing between the date the first white-crowned 

 sparrow identified as a GambeFs sparrow was seen in Hope Ranch in 

 1957 (September 20) and the end of the arrival period, judged by 

 stability of numbers trapped and observed and the general quieting 

 down of the flocks (November 1 at the earliest) is at least 42 days. 

 The comparable period for 195S is at least 48 days. The fall arrival 

 at Santa Barbara over a period of 6 to 7 weeks agrees with the data 

 gained from banding and watching the birds at College, Alaska, in 

 the fall of 1957, which showed the birds continued to pass through the 

 trapping area from at least late July through August 27 or later. 



To the question of whether immatures or adults arrive first in the 

 Santa Barbara region, the data available give no consistent answer. 

 Mrs. Phillips' observations at Hope Ranch agree with those of Henry 

 Kyllingstad at Mountain Village as to the varying proportions 

 of immatiu'es and adults in successive influxes of migrants. The ratios 

 also varied during the years Mrs. Phillips watched. 



Although, as was stated at the beginning of this section, no identity 

 of populations is implied, the observations and banding data from 

 College and from Santa Barbara agree in the following respects. 

 First, the periods of time the birds are on the move, passing through 

 College and arriving at and passing through Santa Barbara, are 

 comparable. Each is 6 to 7 weeks or more. Second, both at College 

 and at Santa Barbara, the migration consists of a series of influxes. 

 There is strong evidence that the members of a given influx did not 

 stay long in the College area, and only slightly less conclusive evidence 

 that many of the arrivals at Santa Barbara did not stay long there 

 either. Third, neither at College nor at Santa Barbara was there a 

 consistent pattern of arrival according to age group. Fourth, the 

 ratios of immatures to adults trapped at College from mid-July 

 through late August varied between approximately the same limits as 

 did the sight estimates made of relative numbers of immatures and 

 adults for the fall arrival at Hope Ranch the same year, and as did 

 the trapping records at Hope Ranch for November of two years. 

 Whatever the hazards of the flight south, the immatures appear to 

 fare about as well as the adults. 



The observations from College, Alaska, and from Santa Barbara, 

 Calif., furnish data for estimates of the length of time spent in the 

 southward migration. Assuming that birds of the latitude of College 

 may fly as far south as Santa Barbara to winter, we know that the 

 interval between the time the local breeding population left College 

 (at least by July 22) and the earliest data of arrival of GambePs 



