. Bulletin of the Department of Agriculture. Agriculture. THE BED SPIDER ON COTTON. 37 INSECTA, THYSANOPTEKA. Thripidae. Scolothrips sexmaculatus Perg.—This species of thrips, as pre- viously recorded, was mentioned by Duffey (1891) as being predacious on the red spider at St. Louis. Chittenden (1909) observed this thrips to be predatory on mites on the Kentucky coffee tree at Washington in 1906. Quayle (1913) states that he has repeatedly observed it to feed on the citrus mite, usually attackmg the egg and younger spiders, and occasionally eating the adult mites. At Bates- burg this thri
. Bulletin of the Department of Agriculture. Agriculture. THE BED SPIDER ON COTTON. 37 INSECTA, THYSANOPTEKA. Thripidae. Scolothrips sexmaculatus Perg.—This species of thrips, as pre- viously recorded, was mentioned by Duffey (1891) as being predacious on the red spider at St. Louis. Chittenden (1909) observed this thrips to be predatory on mites on the Kentucky coffee tree at Washington in 1906. Quayle (1913) states that he has repeatedly observed it to feed on the citrus mite, usually attackmg the egg and younger spiders, and occasionally eating the adult mites. At Bates- burg this thrips has been under observation during four seasons. It ap- pears to be about the earliest predacious enemy of the red spider, havmg been seen on March 11, 1914, as the nymph. It becomes common in May and very abundant throughout June, July, August, and Sep-. FiG. 9.—Anystis agilis, an enemy of the red spider. Highly magnified. (Ewing.) tember, and has been seen as late as December 10. Upon several occasions it has been seen to attack mites in the field. .The 6-spotted thrips has been observed feeding upon red spiders at the following localities: Emporia, Va.; Raleigh, Charlotte, and Laurinburg, N. C; Clemson College, Columbia, Leesville, and Batesburg, S. C; and Mount Pleasant, Miss. Yothers reports it actively predacious in mite colonies on velvet bean,, at Orlando, Fla. A few tests were conducted for the purpose of ascertaining the capacity of this thrips for the various stages of the red spider, and data (Table VII) were secured from six specimens. These 6 thrips (all nymphs) consumed 232 eggs and 5 nymphs and adults in 10 feeding days, which gives an average consumption of eggs and active individuals per feeding day, 98 per cent of which were eggs. It is. 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
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