THE IMMATURE STATE OF THE ODONATA. ital 
Abdomen large, long, more or less tapering, more than half length of 
body, rounded above, flat beneath. Segments of equal length, tenth always, 
and occasionally the ninth shorter, no dorsal spies except in the La Guayra 
species. Lateral spines always on segments seven to nine, generally on six to 
nine, and exceptionally on five to nine and four to nine. Appendages as long or 
longer than the two last segments ; inferiors long, sharp, triangular ; middle ap- 
pendage generally a little shorter, notched at tip, —sometimes of equal lene th, 
with undivided or split tip. Lateral superiors cylindrical, generally shorter, 
exceptionally as long and sharp as inferiors. Male has on the basal portion of 
middle appendage a triangular projection ; short, sometimes cut at tip. Gen- 
itals not very distinctly marked; on ventral segments two, three, and nine. 
Female valve is visible on segment nine, sometimes reaching end of segment. 
The whole body is either smooth, or has a granulated appearance, which is 
due to microscopical spines and small holes, sometimes with flattened yellow 
or pale colored hairs of differing size, never however such as to give a hairy 
look, The La Guayra species is distinguished by its strongly sculptured ap- 
pearance. Generally, the occiput has on each side the median line a polished 
depression, and on the hind angles a series of parallel polished bands, sepa- 
rated by narrow rough lines. The abdomen has on each segment, less 
distinct on the first and apical segments, eight polished impressions; two 
near the median line and two on the edge of abdomen on each side. Color 
pale gray, sometimes darker or brownish black. 
There are frequently black spots on occiput, and the sides near the eyes 
are sometimes bordered with black. Legs have frequently darker rings on 
femora and tibizw, sometimes on tarsi. Abdomen has sometimes a broad 
dorsal band, pale in color, divided in centre by a band which is darker, except 
along the median line, which is again pale. Appendages have the tip some- 
times darker than the basal part. 
GYNACANTHA. 
Rambur, Hist. des Neuroptéres, p. 209. 
Body elongated, very slender, flattened. Length of head greater than 
breadth. Occiput deeply notched at base ; sides straight, forming right angle 
with base. Eyes narrow in proportion, two thirds length of head, not prom- 
inent, broadest in middle, not much produced at inner angles. Antenne 
seven-jointed; sixth joint longest. Mask extending between hind legs, very 
