. Bobolink, Blackbirds, and Grackles . ^ be regarded as belated migrants. The foodfor these five months was found to consist of percent animal mat-ter and percent vegetable. This result would be rather surprisingbut for the fact that only two of the May and nine of the Septemberstomachs were collected in the rice fields. The general character ofthe food during the five months is shown in the accompanying diagram(fig. 2).. Fig. 2.—Diagram showing proportions of animal and vegetable food of bobolink in each month fromMay to September inclusive. (The figures in the margins indicate perc
. Bobolink, Blackbirds, and Grackles . ^ be regarded as belated migrants. The foodfor these five months was found to consist of percent animal mat-ter and percent vegetable. This result would be rather surprisingbut for the fact that only two of the May and nine of the Septemberstomachs were collected in the rice fields. The general character ofthe food during the five months is shown in the accompanying diagram(fig. 2).. Fig. 2.—Diagram showing proportions of animal and vegetable food of bobolink in each month fromMay to September inclusive. (The figures in the margins indicate percentages.) Of the insect food, as determined by the examination, beetles con-stitute nearly 19 per cent. Predaceous species (Carabidse), which are,broadly considered, useful insects, are represented only by a trace;snout-beetles, or weevils (Rhynchophora), amount to percent, andin May to percent; and other beetles, of various families, and all 20 FOOD OF BOBOLINK, BLACKBIRDS, AND GRACKLES. of a more or less harmful character, make up the rest of the coleop-terous food. Hymenoptera, represented b}- ants and some wasps, andby many of the small parasitic species, form percent of the food,and were found mostly in May and July stomachs. The bobolink eatsmore of these useful parasitic H^uienoptera than any other ])ird whosefood ha))its have thus far been investig-ated, although it should be statedthat examinations o
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