EXPLANATION OF THE PLATES. 591 
PLATE XXII. 
FIG. 
1. Male genital organ of a Bombus. a. The male organ. 
6. The prehensor. Vou. IV. p. 562, 565. 
2. Female ditto of the louse. (Swamm.) «a. The oviduct 
with an egg passing through it. 6c. The ovaries. 
d. The colleterium, or varnish secretor. e. The lower 
_ extremity of the oviduct. 
3, 4, Larvee as arranged in the body of two species of vivi- 
parous flies. (Reaum.) Vout. I. p. 254.; IV. p. 164. 
5. Interior of postpectus. Dynastes. a. Parapleura. 
bbb. Points of the postfurca. c. Its stalk. 
. The medifurca of ditto. a. Base. b. Apex. 
. Antefurca of ditto. a. Base. 
. Mesothorax. Calandra. 
. Mesophragm and appendage. Dynastes. aa. Pieces 
adjacent. b. Septula. c. The notch for the transmis- 
sion of the intestines. 
10. Part of metaphragm, ditto. a. A kind of cupule afford- 
ing 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 attach- 
ment to some of the wing-muscles. d. Notch of the 
metaphragm. 
12. Portion of the alitrunk of Melolontha vulgaris. c. Cupule 
attached to the axis of the wings. 
13. Part of the postpectus of Dytzscus marginals, to show the 
operculum, Vot. III. p. 580. 
14, Part of the metathorax of Melolontha vulgaris, to show 
the metapnystega. Ibid. 574. 
15. The pseudocardia, or dorsal vessel of Stratyomis Chame- 
leon. (Swamm.) 
© or aI oO 
* Vor. TV. Letter XLII. ; IIf. p. 581—. 
