. Bulletin - Biological Survey. Zoology, Economic. 82 FOOD HABITS OF THE GROSBEAKS. Ordinarily this insect is harmless, but occasionally it attacks garden and fruit crops, especially the sugar beet. Another caterpillar also, the cotton cutworm (Prodenia ornithogalli, fig. 9), which attacks the latter crop as well as the tomato and cotton, is devoured by the blue grosbeak. Four birds, taken in the cotton fields of Texas in May, had eaten 9 cotton cutworms, which constituted more than 40 percent of their food. Many other caterpillars also of the same family (Sphingidse), as the purslane feeder,
. Bulletin - Biological Survey. Zoology, Economic. 82 FOOD HABITS OF THE GROSBEAKS. Ordinarily this insect is harmless, but occasionally it attacks garden and fruit crops, especially the sugar beet. Another caterpillar also, the cotton cutworm (Prodenia ornithogalli, fig. 9), which attacks the latter crop as well as the tomato and cotton, is devoured by the blue grosbeak. Four birds, taken in the cotton fields of Texas in May, had eaten 9 cotton cutworms, which constituted more than 40 percent of their food. Many other caterpillars also of the same family (Sphingidse), as the purslane feeder, and two moths were consumed by the blue grosbeaks examined. Because of the injurious. Fig. 38.—Purslane caterpillar (Deilephila Hneata). mology.) (From Chittenden, Bureau of Ento- grosbeak is to be habits of these insects their destruction by the commended. The true bugs (Hemiptera) constitute another group of insects, mainly injurious, and all of them eaten by the grosbeak are destruc- tive. These include members of the" squash-bug family (Coreidse), stink-bug family (Pentatomidse), tree-hoppers (Membracidse), and cicadas or harvest flies (Cicadidse). One blue grosbeak from South Dakota had eaten 3 of the latter, which composed 94 percent of its stomach Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Biological Survey. Washington : Govt. print. off.
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