258 NEW YORK STATE MUSEUM 
velopment assisting in copulation. They are also well covered 
with hairs on their interior surfaces. 
In (0) the very well devel- 
oped anterior hamules of 
Gomphoides stigma- 
tus are shown. Here they 
extend well forward under 
Um Sides OL Uae amuenor 
lamina which is indicated at 
1, One should note in this 
figure how far anteriorly 
these first hamules pass and 
that they are an integral 
part of the anterior lamina. 
In (c) the lamina and 
hamules of Gomphidia are 
shown. These first hamules 
are thickly chitinized and 
have a raised edge near the tip, sharp and well covered with hairs. 
Fig. 24 
Figure 24 d shows a sagittal section of these structures to farther 
indicate the point of origin of these hamules from the sides of the 
anterior lamina. / here shows the lamina, hairy and chitinized, 
while is the hamule with its origin well under the lamina. 
Figure 24 e is one of the most peculiar and highly special- 
ized anterior laminae met by the writer. This was found in 
IDOVORIA LrReMES I Saonys woe Ineanule separated tmeom wae 
lamina J by lines which pass just posterior and under the peculiar 
lobes m of the lamina. It is a chitinized structure, specially on its 
inner side where is formed the peculiar notched edge and the 
pointed concave structure lying between the posterior portions of 
the anterior lamina. The lamina itself is almost divided to its an- 
terior end and possesses two well developed fingerlike lobes m 
covered at the ends with hairs. It would be interesting to compare 
any peculiarities of the female structures that might farther eluci- 
date this peculiar lamina and hamule. 3 
In figure 25 at (c) is shown the anterior lamina typical of the 
suborder Zygoptera. This is a sketch of the lamina of Calop- 
teryx. The lamina is well divided above into two parts marked 
o with their posterior ends y lobed and producing on their 
under surfaces the structures marked v and x. The latter ex- 
