198 Annals Eiiiomological Society of America [Vol.1, 



calling the large accesson^ glands or glandulae mucosae, the ves- 

 iculae seminales. The vasa deferentia of Packard's explanation 

 correspond to the vesiculae seminales of Cimbex and the epidi- 

 dymes to the vasa deferentia. Newport's ' description of the 

 male reporductive organ of Athalia centifoliae is so far from cor- 

 rect that it is hardly worth consideration. 



ANATOMICAL DESCRIPTION. 



The male organs of reproduction of Cimbex americana consist 

 of six principal parts: — the testes, the seminal ducts (vasa defer- 

 entia), the seminal vesicles, the accessory glands (glandulae 

 mucosae) , the ejaculatory ducts and the external genital armature. 



The testes are paired (Fig. i, t) and are situated on each side 

 of the alimentary canal, in the sixth abdominal segment. They 

 are kidney-shaped and are completely embedded in adipose 

 tissue. When this adipose tissue is carefully dissected away, it 

 is found that the testes are enveloped by a thin membrane 

 ("capsule enveloppante " of Bordas (3) ). 



A number of tracheae originating froin the fifth and sixth 

 abdominal spiracles (Fig. 2, 5s and 6s) send off numerous branches 

 which penetrate this membrane and hold the testes in their lateral 

 position. One main trunk, which originates near the fifth abdomi- 

 nal stigma, gives off a number of branches to the anterior and of 

 the testis (Fig. 2, tr) ; those tracheae which originate from the 

 sixth abdominal spiracle send off, near the inner margin of the 

 testis, numerous branches which divide and redivide, forming a 

 network on the generative organ. 



Each testis sends off from its inner median margin a very thin 

 cylindrical tube, the vas deferens (Fig. i, vd). Both vasa defer- 

 entia pass backward as straight tubes through the seventh 

 abdominal segment and widen rather abruptly in the anterior 

 region of the eighth segment to form the seminal vesicles. The 

 seminal vesicles make several convolutions (Fig. i, sv) and then 

 communicate posteriorly with the large accessory glands (Fig. 

 I, o). 



The accessory glands or glandulae mucosae are a pair of 

 hooked glands with the distal ends enlarged and rounded, while 

 the posterior portion of each gradually narrows into a duct 

 (Fig. I, gm). The two glandulae mucosae diverge and are 

 obliquely inclined on each side of the anterior region of the rec- 

 tum. These glands partly conceal the last abdominal ganglion, 

 which sends nerves to them. 



