. Bulletin. Geography. 290 PRAIRIE COMMUNITIES usual leader of the clan. On the great plains these united and formed the larger herds of 20,000 to 4,000,000 or more, which have been described by travelers. The males aided in defending the young. The cowbird is said to have fol- lowed the herds constantly. h) Field stratim.—The lepidopterous larvae are similar to those of the low prairie, but much less numer- ous. The hymenoptera are represented by Bom- bus separatus, and many of those recorded on the low prairie. The adult of the parasite {Tiphia vulgaris) of the May-beetle larva (Figs. 296-97
. Bulletin. Geography. 290 PRAIRIE COMMUNITIES usual leader of the clan. On the great plains these united and formed the larger herds of 20,000 to 4,000,000 or more, which have been described by travelers. The males aided in defending the young. The cowbird is said to have fol- lowed the herds constantly. h) Field stratim.—The lepidopterous larvae are similar to those of the low prairie, but much less numer- ous. The hymenoptera are represented by Bom- bus separatus, and many of those recorded on the low prairie. The adult of the parasite {Tiphia vulgaris) of the May-beetle larva (Figs. 296-97) occurs commonly. Several species of aphids ( 298-300) occur, especially on the milkweeds and thistles. These are commonly at- tended by ants, which stroke them and secure the honey dew from the posterior ends of their alimentary canals. The aphids reprcduce rapidly, the young being born in rapid succession at a very ad- vanced state of development. They begin sucking the juices of the plant X at once. Several small parasitic hymenoptera (braconids) (Fig. 299) lay their eggs in the bodies of the aphids. These finally kill the aphids, whose bodies with Fig. 298.—A viviparous grain louse {Macrosiphum granaria Kirby) with her newly born young on a barley leaf (after Washburn, Bull. 108, Minn. Agr. Exp. Sta., Fig. 2, p. 262). \. 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 Geographic Society of Chicago. Chicago, Ill. : Published for the Society by the University of Chicago Press
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeography, bookyear19
