NO. I< 



SENSE ORGANS OF COLEOPTERA — McINDOO 



Pa. 



51 



Fig. 12. — External view of compound and single olfactory organs and olfactory 

 pegs on distal half of last antennal segment of larva of Cotinis nitida. A, 9 com- 

 pound organs and 3 single ones on ventral side of antenna, viewed from a flat 

 surface, X 100 ; 2 of the compound organs at extreme tip are not shown. B, 6 

 compound organs, 4 single ones, and i group of olfactory pegs (Pg) on dorsal 

 side of antenna, viewed from a flat surface, X 100. C, external view of a com- 

 pound and a single organ, X 320 ; the small circles represent pore apertures. 





Fig. 13. — Internal anatomy of sense organs on antenna of larva of Cotinis 

 nitida. A, longitudinal section through tip of antenna, showing innervation of 

 compound (PI) and single olfactory organs (/'), and tactile hair {St)\ two- 

 thirds diagrammatic, X ifx^'. f At this magnification the pore apertures are never 

 discernible). B, cross section through single olfactory organ from antenna, 

 X 500. Ap. pore aperture; Hyp, hypodermis ; NR, nerve branch; NF, nerve 

 fiber ; SC, sense cell ; SF, sense fiber ; and Tr, trachea. 



