. Bulletin of the Department of Agriculture. Agriculture. 10 BULLETIN 2-36, U. S. DEPARTMENT OF AGRICULTURE. edges meeting near their tips. With feeding and growth of the nymph the abdomen elongates without a corresponding growth of the wings, with the result that the latter reach only about to the sixth abdominal segment just before transformation to the adult. The pro thorax extends slightly over the dorsum of the metathorax. The white rings on the antennae, which have grown gradually fainter with each succeeding molt, are now but faintly visible. The external genitalia, the ovipositor
. Bulletin of the Department of Agriculture. Agriculture. 10 BULLETIN 2-36, U. S. DEPARTMENT OF AGRICULTURE. edges meeting near their tips. With feeding and growth of the nymph the abdomen elongates without a corresponding growth of the wings, with the result that the latter reach only about to the sixth abdominal segment just before transformation to the adult. The pro thorax extends slightly over the dorsum of the metathorax. The white rings on the antennae, which have grown gradually fainter with each succeeding molt, are now but faintly visible. The external genitalia, the ovipositor in the female and the forked, supraanal spine in the male, appear to be almost as fully developed as in the adult. The nymph is about five-eighths inch long just after tho molt to this Fig. 10.—The fork-tailed katydid: Sixth-instar nymph. About three times natural size. (Original.) DURATION OF INSTARS. The duration of instars, averaged from all our records, was as follows: Instar I ranged from 10 to 35 days, with an average of days; instar II ranged from 8 to 13 days, with an average of days; instar III ranged from 4 to 12 days, with an average of days; instar IV ranged from 6 to 10 days, with an average of days; instar V ranged from 3 to 15 days, with an average of days; instar VI ranged from 12 to 20 days, with an average of 14 days. The complete nymphal stage required from 58 to 88 days. Nymphs issuing early in the spring were slower to become adults than those issuing later when the average temperatures were higher. After feeding for from 1 to 3 weeks the nymph ceases to eat and remains sluggish for from 24 to 48 hours. The skin then splits along. 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. Dept. of Agriculture. [Washington, D. C. ?] : The Department :
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