208 ANATOMY. 



particularly as in many other insects the same part appears in a similar 

 form. In Blatta, according to Gaede *, there is a large bladder at 

 this precise spot. 



The symmetrical gluten organs are, in the first place, double, and, 

 indeed, short clavate processes,, which, at the point of connection of the 

 sperm duct, empty themselves into the ductus ejaculatorius. We thus 

 find them in Sialis, Ephemera, Lepisma, Nepa, Apis (PI. XXX. f. 8.), 

 and Piophila casei, Meig., in which, however, the clavate bag has a 

 lateral pocket. In the Carabodea and Hydrocantharides, it appears 

 longer, indeed as long as the abdomen, proportionately narrower, and 

 already making some windings. In the former, at least in Calosoma 

 sycophanta, each bag is flat, somewhat depressed from its apex, spirally 

 convoluted, and into it, shortly before its termination, the sperm duct 

 empties itself (PI. XXX. f. 13.) ; in Dyticus, on the contrary, it is 

 round, irregular, twisted, and with its opponent, as well as with the 

 sperm duct, it is bound together. Still longer, and, consequently, more 

 twisted, but otherwise uniform, they appear in Gryllotalpa, where 

 they are at least twice the length of the short testes ; in Stratiomys, 

 it is once and a half as long as the testes and the sperm duct ; in Tinea, 

 equally long, but narrow and filiform. In all these cases, they unite 

 with the sperm duct at one spot, to form a common ductus ejaculatorius. 

 Longer than the testes, but likewise thin, narrow, and filiform, we find 

 them in the Lepidoptera : here, consequently, they make several 

 turnings, and then empty themselves in the sperm duct itself, a short 

 space before its union with the ductus ejaculatorius. (PI. XXX. f. 12.) 

 The Lamellicornia possess the longest. They here appear as two long 

 narrow, much convoluted filiform vessels (PI. XXX. f. 9. 6.), which, 

 towards their base, distend into a long oval occasionally broad bladder 

 (Melolontha), which, together with the sperm duct, passes into the 

 common duct at one spot. The length of this vessel is sometimes con- 

 siderable ; for example, in Oryctes nasicornis, about twenty times as 

 long as the body, but in Cicada, Lat., where we observe similar vessels 

 only five times as long. 



The ramose is the last form of the single-paired gluten organs. 

 We have already observed such in the female appendages in Elater 

 and Hippobosca; among those of the males, we find them in the 

 Capricorn beetles. In Callichroma moschatum, I found a thick tangle 



* Beitrage zur Anatomie der Insekten, p. 20. 



