82 KANSAS UNIVERSITY SCIENCE BULLETIN. 



midrib on the underside of the leaf with her head pointed to- 

 ward the apex of the leaf. In the evening of the same day the 

 female is missing, and two dark longitudinal, parallel lines 

 about 10 mm. in length are discernible on the midrib. With 

 a hand lens (12 y) the eggs can be made out. They are 

 embedded in the midrib, but the ends of the eggs are visible, 

 appearing clearly and of a white color. (See a, fig. 56, pi. 

 XVI.) 



There is no perceptible change until four days later (July 

 4), when the slits are found burst open and the sides of the 

 eggs are exposed to view. (Fig. 56, pi. XVI, at B.) 



On the ninth day of July the slit is spread further, and 

 hatching is in progress. The egg is % rnm. in length, and 

 has a small protuberance at the "hatching end," which is the 

 last end to leave the ovipositors and is that portion visible in 

 the midrib after the egg has been deposited. 



When first hatched the nj-mph is pale yellow, or nearly 

 colorless, but after a period of thirty minutes the color and 

 markings begin to appear. The head, first thoracic segment 

 and tip of abdomen become dark brown, while dark markings 

 are noticeable on the second, third, fourth and fifth rings of 

 the abdomen. The other portion of the dorsal aspect of the 

 body is pale green. The ventral portion of the thorax and 

 abdomen is white, with legs of a pale, transparent yellow. 

 Each of the abdominal segments, except the first, bares two 

 dorsal and two lateral spines or tubercles, one on each side, 

 tipped with black hairs. The second and third segments of 

 the thorax (the undeveloped mesothorax and metathorax) 

 bear hairs in place of spines. The mesothorax, though light in 

 color, bears a dark spot on the front edge. On the cephalic 

 or front edge of the head are four hairs, and there is a hair 

 cephalad and one caudad of each compound eye. The nymph, 

 when one hour old, measures IVn mm. and is extremely active. 



The antennse are pale and transparent, delicately haired, 

 and are very nearly equal to the length of the antennse on 

 the adult forms, being about one-half the length of the nymph. 

 (See fig. 58, pi. XVI.) 



The prothoracic segment, which is dark brown, is a third 

 wider than the mesothoracic segment and as wide as the head. 

 This prothoracic enlargement is, no doubt, the beginning of the 

 overdevelopment of the prothorax to be seen in the maturing 



