REPORT OF THE STATE ENTOMOLOGIST I907 2^^ 



marked by two peculiar folds, one attached directly to the lobe 

 at a and the other forming what appears as a sheath x for 

 the penis p. Attention was called to this particular structure 

 in figure i8 ((i). It is suggested that perhaps the large posterior 

 lobe of the lamina indicated at a may function as a hamule, 

 like the first pair of hamules present in many of the Anisoptera. 

 Letter e shows the anterior portion of 

 the framework which is connected 

 with V the posterior portion at h or 

 the hamule. The penis is supported 

 directly by e and in a position exactly 

 corresponding to the sheath in Anisop- 

 tera. Only its base is shown, with 

 the recurved tip cut off. / shows a 

 line just back of the hamule h ap- 

 parently separating the hamule and ^^^- ^^ "^ 

 the posterior portion of framework v from e the anterior portion. 



In (n) one may note the condition found in the Anisoptera. 

 The well developed hamule h resting on the framework with 

 its prominent hooked end extended posteriorly. The second h 

 refers to another structure developing from the anterior lamina 

 / and functioning where well developed as the first or anterior 

 pair of hamules. .? is the sheath for the penis (penis not shown 

 in the figure : it is attached to segment 3 but extends forward 

 well over segment 2.) ^ is a structure peculiar to the Libel- 

 lulidae, already referred to as the genital lobe and no doubt func- 

 tioning in copulation. 



The greatest difference to be noted in these two figures is 

 in the location of the penis. In Zygoptera we find it on seg- 

 ment 2 and in the exact position occupied by the sheath in 

 Anisoptera. 



Let us now turn to the anterior portion of the second abdom- 

 inal sternite. In figure 24 there are several anterior laminae of 

 Anisoptera, each showing quite clearly that portion of the lamina 

 which the writer holds has developed into the anterior pair of 

 hamules. 



In (a) the anterior lamina of Didymops is shown. / is the 

 lamina, with h the highly chitinized first pair of hamules well 

 developed and slightly reflexed on their edges, no doubt a de- 



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