(14) 



The discrepancies existing between the summary and the original rec- 

 ord were, in the case of the Swallow and the Catbird, so radical that the 

 writer did not feel justified in making them in the table but will add here 

 the dates obtained from the latter source. For the Swallow they are Apr. 

 16, '66; Apr. 26, '67; May 1, '68; Apr. 28, '69; Apr. 29, '72; May 1, '74; May 

 15, '75. For the Catbird, Apr. 28, '66; May 8, '67; May 1, '68; Mar. 28, '69 

 (probably an error); Apr. 28, '72; Apr. 27, '73; Apr. 30, '74; May 14, '75; 

 Apr. 26, '76; May 1, '77; Apr. 18, '78. 



"Of the birds, the Blue Jay, Robin and Bluebird can hardly be termed 

 migratory, as at most any time during the winter a few warm days will 

 bring theni around us; to leave again if it becomes too cold. " — Trans. State 

 Board Agr. for 1879. 



In this summary the "Swallow" is the White-bellied Swallow [Tachy- 

 cincta bicolor Vieill.), the "House Martin" doubtless the Purple Martin 

 {Prognc siihis Linn.), and the "Pewee" is the Phoebe {Sayoniis phoebe 

 Lath.). 



The average date of arrival of any species may be reckoned by count- 

 ing for each year the number of days from the earliest recorded date to the 

 date for that year, averaging these figures, and then adding to the earliest 

 recorded date the number of days corresponding to the average so obtained. 

 Thus for the Robin, during twenty years the earliest recorded date is Feb. 

 3, '77, the latest Apr. 20, '67, the average obtained 41, or the average date 

 of arrival Mar. 16. It is evident that to take a date midway between the 

 earliest and latest dates would lead to error, for it would give an undue ef- 

 fect to a very early or a very late date, which may have been in the one 

 case due to an accident, and in the other to deficient observation. In this 

 computation winter dates are neglected since it is only the migrants with 

 which we are dealing. 



This method gives the following average dates of appearance, taking 

 the summary as printed above: 



If the dates afterward given for the Swallow and Catbird be substitut- 

 ed for those in the summary, the dates become, respectively, May 5 and 

 April 30, or practically the same as above. 



Other dates appear here and there in the record. Aside from those for 

 "Plover", "Cranes", "Geese", "Ducks", "Yellowhammers", "Ground Spar- 

 rows", "Flickers" and "Chickadees", all of which are either resident 

 throughout the year or not referable to any particular species, we find the 

 dates which follow: Meadow Lark, Mar. 19, '66, Apr. 7, '67, Mar. 16, '68, 

 Mar. 27, '69, Apr. 29, '73, Apr. 10, '74; Chipping Sparrow, Mar. 22, '66; 

 Kingfisher, Mar. 27, '66, Apr. 6, '67, Mar. 23, '68, Apr. 8, '69; Mourning 

 Dove, Apr. 20, '66; Woodcock, Apr. 7, '67; Nighthawk, Mar. 26, '69, May 



