28 BULLETIN 619, U. S. DEPABTMENT OF AGRICULTURE. 



TABULAR SUMMARY. 



The following table shows the relative proportions of the most im- 

 portant elements of the food of the seven species of swallows : 



Food items. 



Purple 



martin. 



Cliff 



swal- 

 low. 



Barn 



swal- 

 low. 



Tree 

 swal- 

 low. 



Violet- 

 green 

 swal- 

 low. 



Bank 

 swal- 

 low. 



Rough- 

 winged 

 swal- 

 low. 



Aver- 

 age for 

 the 

 seven 

 species 

 of swal- 

 lows. 





Per 

 cent. 

 2.63 

 9.90 

 3.52 

 19.47 

 14.58 



16.09 

 9.39 

 1.09 



22.87 

 .46 



Per 



cent. 



8.38 

 18.50 



8.24 

 20.51 

 26.32 



13.25 



.46 



.71 



2.56 



.41 



.66 



Per 

 .cent. 



1.96 

 13.66 



9.89 

 12.82 

 15.10 



39.49 



2.39 



.51 



3.72 



.28 



.18 



Per 

 cent. 

 1.92 

 12.50 

 6.37 

 7.58 

 5.59 



40.54 

 1.07 

 .38 

 4.25 



.34 



19.46 



Per 



cent. 

 4.12 

 6.45 

 It. 42 

 17.48 

 35.96 



19.36 

 3.12 



4.09 



Per 



cent. 



5.78 

 12.12 

 13.39 

 20.10 



7.96 



26.63 

 1.21 



.01 

 12.64 



.14 



.02 



Pa- 

 cent. 

 4.93 

 9.90 

 11.99 

 18.91 

 14.90 



32.89 

 1.11 



.12 

 4.48 

 .56 



.21 



Per 



cent. 

 4.25 





11.86 





8.97 





16.70 





17.20 





26.89 





2.68 





.40 





7.80 





.31 





2.93 









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