. Birds of a Maryland farm : a local study of economic ornithology . owlark. Orchard oriole. Baltimore swallowBank vireo. AVarbling vireo. White-eyed vireo. Yellow warbler. Magnolia warbler. Black-poll warbler. Louisiana water-thrush. Maryland yellow-throat. Chat. Redstart. Catbird. Long-billed marsh wren. Olive-backed thrush. In this mischief the flycatchers are oy all means the greatestoffenders, the swallows next, and, less generally
. Birds of a Maryland farm : a local study of economic ornithology . owlark. Orchard oriole. Baltimore swallowBank vireo. AVarbling vireo. White-eyed vireo. Yellow warbler. Magnolia warbler. Black-poll warbler. Louisiana water-thrush. Maryland yellow-throat. Chat. Redstart. Catbird. Long-billed marsh wren. Olive-backed thrush. In this mischief the flycatchers are oy all means the greatestoffenders, the swallows next, and, less generally but still noticeably,the warblers next. Of all the flycatchers the wood pewee appeared to be the most active and per-sistent in this wasps are not usu-ally so alert and swift asmany other insects; there-fore they are easy of the class are ichneu-mon flies (Ichncumonida?—fig. 13). Somewhat morethan a fifth of the birds thathad taken parasitic wasps,however, had fed on a cer-tain black wasp, Tiphia inor-nata, which is a vigorous. Fig. 13.—Ichneumon fly (after Howard; loaned byDivision of Entomology). enemy of the larva of theMay-beetle. These waspsare so common in May and June that it is not unnatural that agood many should fall prey to birds. The only other noticeablyabundant parasitic Hymenoptera were some very large braconids INSECT FOOD. 41 (Melanobraoon), of which at anytime during-the first part of September,1896, a dozen could have been collected within a few minutes. Fieldsparrows and probably other birds consumed them freely, though asa rale parasitic Hymenoptera are eaten only in small numbers. Many of these useful species appear too late in the season to be ofmuch effect. An attempt was made to measure the evil effects of theirdestruction by observing how far they were parasitizing abundantinsect pests, but conditions were unfavorable and adequate resultswere not obtained. The white grub of the May-beetle was not presentin number
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirds, bookyear1902
