80 



Annals Entomological Society of America [Vol. XII, 



forth processes through the pore canal to the base of the hair 

 (Hr). Should both the base of the hair and the hair-mother cell 

 be missing, the hair socket itself in sections serves well to 

 distinguish this structure from a pore. 



To determine whether all of the structures recorded as pores 

 are really pores or hair sockets, thin sections made through the 

 various parts of the integuments bearing these structures were 



41 42 45 AA 45 46 47 4S 



Figs. 29 to 48. — Sections, showing internal anatomy of pores or punctures and of 

 one hair from various lepidopterous larvae, X 500. Figs. 29, 31 to 34 are pores 

 from Ceratomia catalpce; Fig. 29, being from epicranium; Fig. 31, from antenna; 

 Fig. 32, from palpiger; Fig. 33, from labium; and Fig. 34 is internal structure 

 of a large hair on epicranium. Fig. 30 is a pore from labrum of Telea poly- 

 phemus and Fig. 35, two pores from labruin of silkworm {Bonibyx mori). Figs. 

 36 to 38, maxillary pores/ (Mxf), g (Mxg), j (Mxj) and i (Mxi), respectively, 

 of tomato worm Phlegothontius sex fa). Fig. 39, pore from labnmi and Fig. 40, 

 pore from antenna of cabbage-butterfly larva [Pontia rapa:). Figs. 41 to 48, 

 sections from material, treated with caustic potash. Fig. 41, pore from 

 terminal segment of maxillary palpus of codling moth {Laspeyresia pomonella). 

 Figs. 42 to 48, pores from army worm {Cirphis unipuncta); Fig. 42, from tibia; 

 Fig. 43, from antenna; Fig. 44, from maxillary lobe; Fig. 45, from femur; Fig. 46, 

 from mandible; Fig. 47, from front; and Fig. 48, from anal proleg. Sense 

 cell (SC); hypodermis (Hyp); sensory fiber (SF); pore canal (Cati); chitinous 

 cone (Con); pore aperture [Ap); hair-mother cell (HrMC); and base of 

 hair (Hr). 



carefully studied; in every case the suspected pore proved to 

 be a real pore. Since most of these are so scattered, they are 

 easily overlooked in sections made from fixed material, but 

 were found much more easily in sections made from material 

 treated with caustic potash (Figs. 41 to 48). 



