. Birds of a Maryland farm : a local study of economic ornithology . longi-corn beetles, leaf-chafers, click-beetles, and metallic wood-borers(Buprestidse),amounted to percent; while miscellaneous beetles,largely dung-beetles of the genera Aphodius (tig. 15), Atmnius, andOnthophagus, and beetles of a numberof other families, such as the Anthicida\Bruchidee, Byrrhid«, Sisteridee, Staphy-linidie. and Tenebrionidse, completed theremaining percent of the beetle spiders were largely the ground-spiders of the family Lycosid®. Spidersare said to do about as much good asharm, and a
. Birds of a Maryland farm : a local study of economic ornithology . longi-corn beetles, leaf-chafers, click-beetles, and metallic wood-borers(Buprestidse),amounted to percent; while miscellaneous beetles,largely dung-beetles of the genera Aphodius (tig. 15), Atmnius, andOnthophagus, and beetles of a numberof other families, such as the Anthicida\Bruchidee, Byrrhid«, Sisteridee, Staphy-linidie. and Tenebrionidse, completed theremaining percent of the beetle spiders were largely the ground-spiders of the family Lycosid®. Spidersare said to do about as much good asharm, and are usually regarded as of noeconomic importance. Beneficial insects (predaceous beetlesand parasitic wasps) formed per-cent of the food, while injurious insects, principally caterpillars,grasshoppers, and harmful beetles, amounted to percent. Itwill be remembered, however, that what has already been said aboutthe dot ruction of useful species shows that but a small fraction of thepercentage of these insects should really be counted against the Fio. L5.—Dung-beetle (Aphodius) (afterProf. s. a. Forbes). FOOD OF NE8TLINGS, }:; FOOD OF NESTLINGS. The largest consumption of insects is to be credited, not to adultbirds, but to young ones in the nest. All land birds at Marshall Hallexcept birds of prey and doves, whatever be their own diet, feedtheir young chiefly on insects from the time they are hatched untilthey Leave the nest. Many species rear every season two or threebroods of from 3 to 5 each, and so voracious are these wide-mouthedyoungsters that the parents can supply their wants only by unremit-ting efforts. Meals often begin before sunrise and continue till aftersunset, frequently occurring every two minutes. At first nestlingstake considerably more than their own weight of food in a day. andthey increase in weight daily from 20 to 50 percent. The number ofinsects required to supply a seasons host of nestlings must he almostincalculable. Work of other
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirdsma, bookyear1902
