168 



THE ENTOMOLOGIST. 



of the vas deferens, in the second around a more or less consider- 

 able portion of its length ; they occur in Cleridte, Heteromera, 

 Coccinellidae, Hydrophilidse, Staphylinidae, and Silphidse (Fig. 6). 



v.d 



Fig. 5. Fig. 6. Fig. 7. 



Three types of male sexual organs in Coleoptera (represented diagrammatically). 

 t., testis ; v. d., vas deferens ; e. d., ejaculatory duct ; a. g., accessory gland. 



In the third section, the testes are composed of rounded, more 

 or less depressed capsules, having each its own separate duct 

 or pedicel, and abutting, sometimes at the same point, some- 

 times at different points, upon the vas deferens. Testes of this 

 kind, which Lacordaire considered to be those of the most 

 perfect organization, are met with only in the Longicorns, 

 Chrysomelidse, Ehynchophora, and Lamellicorns. 



Dr. Bordas, who has recently carried out similar investiga- 

 tions on a more extended scale, has arrived at practically the 

 same results. He divides the testes into (1) simple and 

 (2) compound ; and of the latter he makes two subdivisions, 

 according as the seminal glands are (1) " fasciculees," and (2) 

 "disposees en grappes." 



Simple tubular testes, which he considers to be the more 

 primitive type, are characteristic of the Adephaga, and confined 

 to that group. In all other beetles that he examined the testes 

 were compound. 



The compound testes of his first subdivision correspond with 

 those of Lacordaire's third section. The glands, from two to 

 twelve in number, of which each organ is composed, are not 

 simple follicles like those of the other subdivision, but consist 

 each of a number of ampullae arranged radially within a common 

 covering and opening into a central receptacle formed by the 

 dilated end of the duct that leads to the vas deferens. Organs of 

 this type, represented diagrammatically in Fig. 7, were met with 



