. Bulletin of the Department of Agriculture. Agriculture. 8 BULLETIN 256, U. S. DEPARTMENT OF Fig. 6.—The fork-tailed katydid: Second- instar nymph. Somewhat more than twice enlarged. (Original.) forming the dorsum of the mesothorax and metathorax appear as little flap-like, evenly rounded processes folded down over the upper portion of the episterna and epimera of their respective segments. These semicircular processes are the wing rudiments and are dis- tinctly characteristic of this instar. Second instar (fig. 6).—Measurements: Breadth of head, mm.; greatest breadth o
. Bulletin of the Department of Agriculture. Agriculture. 8 BULLETIN 256, U. S. DEPARTMENT OF Fig. 6.—The fork-tailed katydid: Second- instar nymph. Somewhat more than twice enlarged. (Original.) forming the dorsum of the mesothorax and metathorax appear as little flap-like, evenly rounded processes folded down over the upper portion of the episterna and epimera of their respective segments. These semicircular processes are the wing rudiments and are dis- tinctly characteristic of this instar. Second instar (fig. 6).—Measurements: Breadth of head, mm.; greatest breadth of abdomen, mm.; length of body, 6 mm.; length of pronotum, mm.; length of posterior femur, mm.; length of antenna, 14 mm. The markings on the body are the same as in the preced- ing instar, but the ground color of the abdomen is bright green, making the spots on it less conspicuous. The small, flaplike wing rudiments are now almost equilaterally triangular, with nearly pointed and but very slightly rounded tips. The bright green color of the ab- domen and the triangular shape of the wing-pads readily distinguish this stage from the preceding one. Just after the first molt the nymph is about one-fourth inch long. Third instar (fig. 7).—Measurements: Length of body, mm.; length of pronotum, mm.; length of posterior femur, mm.; length of antenna, 17 mm. The general color and markings of the body are as in the second instar, the intensity of the green coloring varying in different individuals. In this and succeeding instars the head and abdomen are less broad compared with the thorax than in instars I and II. The wing rudiments are triangular as in the second instar, but their hind margins extend downward and very slightly forward, while the front margin extends more abruptly backward than in pre- ceding stages, thus making the sides unequal in length. Faint evidences of wing-veins may be distinguished at this stage. Just after molting to this instar
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