156 
IOWA ACADEMY OP SCIENCES. 
Dorsulum well developed, usually tinged with yellow and 
has whitish markings. 
Mesonotum of medium size, has two broad, yellow longitud- 
inal bands on either side of median white line, which is broken 
in the middle, the ends somewhat triangular in shape and the 
points turned toward each other. Between the two bands on 
each side is a fine, curved, whitish line ending at the slight 
posterior angles of the dorsulum, and posteriorly at the whit- 
ish scutellum. Between the base of the anterior wings and the 
yellow bands, the mesonotum is more light colored. 
The wings are transparent, characteristic for this genus, but 
present no special specific characters. 
Ventrally the thorax is light green, sometimes tinged with 
bluish, sometimes tinged with yellowish. The legs are light 
colored, the tibiae and tarsi usually bluish green, distal end of 
posterior tibia and first tarsal joint with prominent black 
spines. Terminal claws and adhesive pads of second joint well 
developed. 
Mouthparts inconspicuous, tip of terminal segments black. 
Genital organs about same length as abdomen of female 
soon after transforming to adult, but as the developing ovaries 
gradually distend the abdomen, the ovipositor appears rela- 
tively shorter. The dorsal plate is longer than the ventral, 
although when closed their tips come near together. Anal 
opening large and prominent. From there on the dorsal plate 
descends rapidly, is almost straight, except the tip which 
is short, wedge-shaped, the angles rounded and slightly 
turned upward. Its margins are curved upward at tip, and at 
about one-third their length curve downward ard meet the ven- 
tral plate which is large at base, of equal width to about its 
middle where it turns distinctly upward and tapers rapidly and 
evenly to a point. Some show a distinct concavity just beyond 
the turn. The basal portion of the upper margin distinctly 
curved upward. 
The inner division of the egg sheath can be seen when the 
plates are slightly spread. The tip is chitinous, brownish, 
strongly curved upward and narrowing rapidly. The outer 
more transparent division is visible, flat, the apical angles 
broadly rounded. 
The ventral plate is about two- thirds as long as dorsal one. 
Their tips coming so closely together is due to the fact that the 
base of the upper plate is farther forward than the base of the 
