THE OLFACTORY SENSE OF_^COLEOPTERA. 457 



MPPg small massive pit peg on antenna. 



N nerve. 



NB nerve branch. 



Neu neurilemma. 



NeuNuc nucleus of neurilemma. 



NeiirNiic .... neuroglia nucleus. 



P pit of pore. 



PorAp pore aperture. 



PorGl pore of gland. 



PorHr pore of hair. 



PorPl pore plate on antenna. 



For pore of olfactory organ. 



PorW pore wall. 



PorWGl pore wall of gland. 



PorWHr pore wall of hair. 



R radius. 



RP radial plate. 



SB small sense bristle on antenna. 



SC sense cell. 



SCi sense cell of tactile hair 



SCG sense cell group. 



SCNuc sense cell nucleus. 



SCNucl sense cell nucleolus. 



Sc subcosta. 



ScH subcostal head. 



SF sense fiber. 



Tar tarsus. 



Th tibia. 



TbSp tibial spine. 



THr tactile hair. 



Tr trachea. 



TrNuc Nucleus of trachea. 



Tro trochanter. 



I to 6 groups Nos. i to 6 of the olfactory pores. 



a location of scattered pores on ventral side of wing. 



h and c location of scattered pores on tibia. 



