EXPLANATION OF THE PLATES. 613 



FIG. 



12. Part of the trunk of Goerius olens, to show its antepectoral 



spiracle. VOL. IV. p. 43. 



13. Part of the abdomen of Pneumora. a. The series of 



ridges, by striking the hind leg over which they pro- 

 bably produce their noise. VOL. II. p. 391 5 III. p. 339. 



14. Underside of part of the alitrunk of Lygceus sexmacu- 



latus K. MS. b. Branchiform apparatus between the 

 scapula and parapleura. VOL. IV. p. 45. 



15. , ., i . Pentatoma rufipes. 



a. Corrugated membrane, b. Apparent fringe of hairs 

 or bristles. Ibid. 



16. Spiracle of larva of Oryctes nasicornis. (Sprengel.) 

 17. - Dytiscus marginalis. (Ibid.) 



18. Part of the trachea and bronchiae of the pupa of Smcrin- 



thus PopulL (Ibid.) 



19. Spiracle of the imago of Oryctes nasicornis. a. The boss. 



(Ibid.) 



20. Dorsal spiracle of Cermatia. 



21. Pencil of hairs attached to a supposed respiratory plate 



in certain Noctuidce. VOL. IV. p. 60. 



22. Part of the back of the abdomen of the pupa of a Penta- 



toma. a. Pseudo- spiracle. 6. Connecting corrugations. 

 VOL. III. p. 713. 



23. Unilabiate spiracle of Gonyleptes. 



24. Portion of ventral segments of abdomen of Aradus lami- 



natus K. a. Tobaccopipe-shaped organ near the ven- 

 tral spiracles. VOL. III. p. 713. 



25. Part of the back of the alitrunk of Belostoma grandis, to 



show the metapnystega ? or rather spiracle. VOL. III. 

 p. 572; IV. p. 45. 



26. Pseudo-spiracle of Carkinodes cancriformis. VOL. III. 



p. 714. 



27. Part of the ventral segments of the abdomen of Lyg<zus 



compressipes. a. Pseudo-spiracles. 



28. Portion of dorsal segments of Dytiscus marginalis, to 



show the large anal spiracles. VOL. IV. p. 42. 



