232 THE UNIVERSITY SCIENCE BULLETIN. 



First Ins tar. 

 Size. Length, 1.29 mm.; width af body, 0.754 mm.; width of head, 

 0.598 mm.; distance between eyes, 0.416 mm. 



Shape. Width greater than one-half the length. Body very flat in 

 the newly hatched. 



Color. Newly hatched almost transparent, but in the course of a few 

 hours assuming the color pattern delineated in fig. 8 of pi. XXVI. Gen- 

 eral color is pale yellow, the darker pigment being smoky. The pro- 

 thorax, mesothorax and metathorax each bear a pair of irregular smoky 

 blotches. The pair on the metathorax being large and extending to 

 lateral margins of the seg-ment. Part of the color of the abdomen is due 

 to the food in the digestive tract vnthin. In the nymphs about ready to 

 transform the entire body is darker. 



Second Instar. 

 Size. Length of body, 1.77 mm.; width of body, 0,936 mm.; width of 

 head, 0.78 mm.; distance between eyes, 0.442 mm. 



Color. Darker than in other instar. The body transversely banded 

 with darker pigment. The transverse lines on thorax and abdomen are 

 reddish-brown. The other dark areas smoky. A smoky band parallel 

 with margin distinguishes this species from the same stage of Palma- 

 corixa biienoi. The head is marked by three longitudinal smoky bands. 



Third Instar. 



Size. Length, 2.31 mm.; width of body, 1.19 mm.; width of head, 0.99 

 mm.; distance between eyes, 0.52 mm. 



Color. Third instar nymphs often darker than second and have a 

 definite color pattern. The hair upon the wing-pads now appears, and 

 enmesh the air. Head: eyes dark red, head pale, marked by a median 

 longitudinal dark band; faint lines lie between this and the eye, one on 

 either side. Rear margin of head fringed with black hairs especially 

 near the dorsal median line. Margin of wing-pads dark and fringed with 

 a pile of fine dark hair. Prothorax hidden. Mesothorax is traversed 

 by a reddish-brown band near posterior margin. The hairy fringe of 

 fore wing-pads continues across the dorsum. Metathorax pale with a 

 smoky pattern of five spots, the median one crossed by the pale median 

 streak that reaches the length of the thorax. These spots consist of 

 crescentic patches in front, their inner horns almost touching the median 

 triangular patch of color, on either side of which lie the right angled 

 patches. Posterior margin reddish-brown. Abdomen; margin smoky 

 gray, the suture between the tergites marked by dark reddish-brown 

 bands; two rows of irregular quadrangular patches of smoky color lie on 

 either side of median line, from third to sixth, inclusive. Three pairs of 

 odoriferous pores, front ones on caudal margin of third segment small, 

 the second and third pairs larger, and the very dark glands are apparent 

 beneath the integument. Dark ring around auiiSr Legs for the most part 

 pale; hair fringe dark. 



