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NEW YORK STATE MUSEUM 



velopment assisting in copulation. They are also well covered 

 with hairs on their interior surfaces. 



In (b) the very well devel- 

 oped anterior hamules of 

 G o m p h o i d e s stigma- 

 t u s are shown. Here they 

 extend well forward under 

 the sides of the anterior 

 lamina which is indicated at 

 /. 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. 

 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 h 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 

 Boyeria irene; h shows the hamule separated from the 

 lamina / 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. 



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 

 with their posterior ends y lobed and producing on their 

 under surfaces the structures marked v and x. The latter ex- 



