238 Jones, Bird Migration in Ohio. rtuly 



of swamps remain in the scattered timber patches, or along 

 streams near the lake. The timbered tracts consist of tall trees 

 skirted by a little fringe of brush, or second growth sprouts, 

 lacking the true brush lands of Iowa. The trees composing 

 the woods do not materially differ from those of Iowa except in 

 being much taller and more slender, without low branches as 

 a rule. 



While the region is an excellent one for the nesting of many 

 species, it is not adapted to migration routes of many other 

 species, they following the river courses in preference to crossing 

 the flat higher lands. Scarcely any water birds are seen away 

 from the rivers, which are not easily accessible in early spring. 



The accompanying charts differ from those already explained 

 only in covering both spring and fall migrations for one year 

 instead or a single migration for several years. Hence, the line 

 or lines following the name of any species represents the whole 

 time during which the species was present during the year, unless 

 it is a resident or winter visitor. 



These charts give an excellent idea of the waves of movement 

 during the year. Not until March is any movement perceptible. 

 Then the season opens with the arrival or increase of four species, 

 followed in a few days by five more, these followed a little later 

 by four more, making a triple wave of thirteen species. This 

 wave accompanies the first warm wave of March. 



Omitting three species which were probably overlooked, and 

 therefore belong to the first wave, the next wave occurred about 

 the first of April, when five species arrived and one departed. 

 Then nearly three weeks passed without any perceptible move- 

 ment, due to continued damp and chilly weather and northerly 

 winds. 



A warm wave about the 20th of April caused the movement of 

 twenty-seven species, seventeen of which were arrivals and four 

 departures. Then followed the great May movement — somewhat 

 more scattered than we have seen in Iowa, but none the less 

 marked — of forty species, all but three of which were arrivals. 



The last movement occurred wholly in May, and was more 

 scattering than the one preceding it. With the exception of one 

 species, it was composed of departing migrants. 



