OLFACTORY ORGANS OF A COLEOPTEROUS LARVA 



125 



from 112 to 121, with 116 as an average. All of the pores 

 observed on the mandibles were found on the dorsal surface, with 

 the exception of two at the base of a mandible (fig. 28) on the 

 ventral side. Adding the average number of pores found on the 

 three parts of the maxilla, it is thus seen that this appendage 

 bears 65 pores, two-thirds of which lie on the ventral surface. 

 About seven-eighths of the pores found on the labrum, all of those 

 observed on the labium, and about one-half of those seen on the 

 antenna lie on the ventral surfaces of these appendages. All of 



Figs. 28 and 29. Disposition of the compound {PI) and single olfactory organs 

 (black dots), and olfactory pegs {Pg) on head and head appendages, X 9; fig. 28, 

 ventral surface and fig. 29, dorsal surface. The opposite sides of the same append- 

 ages are shown at opposite sides in the two figures. Maxillary palpus (MxPlp), 

 lacinia (L), cardo (C), mentum (Mt), submentum (SMt), and labial palpus 

 (LbPlp). 



