. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 14 THE RED SPIDER ON HOPS IN CALIFORNIA. LOCOMOTION. In order to determine the probable distance that an adult female mite is capable of crawling in one day, experiments were conducted in the laboratory. A sheet of paper 3 by 4 feet was placed in front of a window in a warm room, a female mite placed in the center of the paper, and its progress followed with a pencil for one hour. (See. Fig. 5.—Track of a red spider on blotter, covering a distance of 40 feet 9 inches and representing movements during one hour. Sa
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 14 THE RED SPIDER ON HOPS IN CALIFORNIA. LOCOMOTION. In order to determine the probable distance that an adult female mite is capable of crawling in one day, experiments were conducted in the laboratory. A sheet of paper 3 by 4 feet was placed in front of a window in a warm room, a female mite placed in the center of the paper, and its progress followed with a pencil for one hour. (See. Fig. 5.—Track of a red spider on blotter, covering a distance of 40 feet 9 inches and representing movements during one hour. Sacramento, Cal., 1912. (Original.) fig. 5.) In two cases loose soil was placed on the paper. Table II sums up the results. Table II.—Distance traveled by adult female red spiders in one hour on smooth paper and on loose soil. Ex- peri- ment No. Surface used. Distance traveled. Distance gained. 1 Ft. in. 22 4 23 8 3 7i Ft. in. • 2 do 3 do 2 0 4 Loose soil 0 11J 5 20 5 15 9 40 9 6 2 6 do 7 do 8 Average for paper 21 1 0 11% 6 2 The surface of the paper corresponds very well with that of the hopvine, and at this rate an average female mite is capable of cover- ing 211 feet of vine surface during a period of 10 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 Entomology. Washington : G. P. O.
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