604? EXPLANATION OF THE PLATES. 



PLATE XXII. a 



FIG. 



1. Male genital organ of a Bombus. a* The male organ. 



b. The prehensor. VOL. IV. p. 576, 580. 



2. Female ditto of the louse. (Swamm.) a. The oviduct with 



an egg passing through it. b c. The ovaries, d. The 

 colleterium, or varnish secretor. e. The lower extremity 

 of the oviduct. 



3, 4. Larvae as. arranged in the body of two species of vivipa- 

 rous flies. (Reaum.) VOL. I. p. 257 j IV. p. 170. 



5. Interior of postpectus. Dynastes. a. Parapleura. 



b b b. Points of the postfurca. c. Its stalk. 



6. The medifurca of ditto, a. Base. b. Apex. 



7. Antefurca of ditto, a. Base. 



8. Mesothorax. Calandra. 



9. Mesophragm and appendage. Dynastes. a a. Pieces ad- 



jacent, b. Septula. c. The notch for the transmission 

 of the intestines. 



10. Part of metaphragm, ditto, a. A kind of cupule affording 



a point of attachment to muscles, d. A deep notch for 

 the intestines. 



11. Interior of the upper side of alitrunk of ditto, a. The 



cavity of the chest between the prophragm and meso- 

 phragm. b. Ditto between the mesophragm and me- 

 taphragm. c. Cupules that afford a point of attachment 

 to some of the wing-muscles, d. Notch of the meta- 

 phragm. 



12. Portion of the alitrunk of Melolontha vulgaris. c. Cupule 



attached to the axis of the wings. 



13. Part of the postpectus of Dytiscus marginalis, to show the 



operculum. VOL. III. p. 578. 



14. Part of the metathorax of Melolontha vulgaris, to show the 



metapnystega. Ibid. 572. 



15. The pseudocardia, or dorsal vessel of Stratyomis Chamce- 



leon. (Swamm.) 



* VOL. IV. LETTER XLII.; III. p. 580-. 



