460 N. E. MCINDOO. 



Plate II. 



Fig. 20. Three olfactory pores from wing of Passalus. 



Fig. 21. Six olfactory pores from elytron of Orthosoma. 



Fig. 22. Cross section through wing of Orthosoma, showing anatomy of wing 

 beneath olfactory pores. 



Fig. 23. Olfactory pore from elytron of Passalus, showing sense cell (SC) 

 connected with pore aperture (PorAp) and with nerve (N); also hypodei-mal cell 

 (HypC) that forms the cone (Con). 



Fig. 24. Olfactory pore from trochanter of Epicauta marginata. 



Fig. 25. Olfactory pore from trochanter of Epicauta pennsylvanica. 



Fig. 26. Olfactory pore from trochanter of Leptinotarsa lo-lineata. 



Fig. 27. Three olfactory pores from tibial spine of Epicauta marginata. The 

 material used for Figs. 24 to 27 had been treated with caustic potash. 



Fig. 28. Transverse-longitudinal diagram of proximal end of trochanter be- 

 longing to right hind leg of Epilachna, showing internal anatomy of leg and super- 

 ficial view of hairs, hair sockets, gland pores and olfactory pores. The four pores 

 at the right belong to group 6 and the three at the left belong to group 5. 



Fig. 29. Oblique transverse-longitudinal diagram of portion of peduncle 

 belonging to Epilach^ta, showing internal anatomy of radial plate {RP), innervation 

 of olfactory pores and a superficial view of a few of the pores in group i. The 

 transverse portion of the diagram passes through the radial plate in the direction 

 of the line marked "a" in text Fig. iB. 



Fig. 30. Oblique superficial view of olfactory pores on wing of Epilachna, 

 showing sense fibers (,SF) connected with pore apertures {PorAp). 



Fig. 31. Transverse-longitudinal diagram of portion of wing belonging to 

 Orthosoma, showing internal anatomy of wing, innervation of olfactory pores and 

 a superficial view of a few of the pores on radius {R) and media {Me). 



