MALE GENERATIVE OKGANS OJF MELOLONTHA. 



335 



objects situated nearer to us or further off than that upon which we fix 

 our attention ; so that ; according to this supposition, insects would see 

 very distinctly with one eye only, exactly as we see confusedly an exten- 

 sive landscape, although we only distinguish a small part of it. 



(875.) In all insects the sexes are quite distinct ; and the generative 

 apparatus, both of the male and female, consists of various secreting 

 organs with their excretory ducts : in the male, such glands furnish the 

 impregnating secretions ; and in the female give origin to the ova, and 

 provide the covering wherein the eggs are enveloped. 



(876.) Commencing with a description of the male organs, we find 

 in the Cockchafer various parts represented in the accompanying figure, 

 taken from the admirable work of Straus-Durckheim already so often 

 quoted. The testicles ofMelolontha (fig. 167, a a) are six in number on 



Fig. 167. 



Male generative organs of Melolontha vulgaris : a a a, testicular glands ; 655, vasa deferential 

 c c, common canal ; d, its dilated portion ; d', termination of the corresponding canal from the 

 opposite side; eef,f, auxiliary glands; g g, common duct enclosed in a sheath, h; ii, ejaculatory 

 apparatus ; II, nn, section of penis. 



each side of the body ; but, in the engraving, those of one side only are 

 delineated. Every testis consists of a vesicular organ, hollow internally, 

 which, being immersed in the juices of the insect, separates therefrom 

 the seminal fluid. Six ducts (6 b b) may be called vasa deferentia, and 

 convey the spermatic liquor into a common canal (c c), of very consider- 

 able length and much convoluted. Although slender at its commence- 

 ment, this tube ultimately expands into a wider portion (d), wherein, 



