412 



N. E. MCINDOO, 



basal margin (BM) of the elytron so that all or a portion of the 

 group may be concealed. In such a case it is necessary to pull 

 the peduncle from beneath the base of the elytron in order to 

 count the pores. Group No. i on the left elytron consists of 

 71 pores (Plate I., Fig. 4), while the same group on the right 

 elytron has 78 pores. 



Groups Nos. 2, 3 and 4 lie on the dorsal surface of the wing on 

 the radius (Text-fig. iC, R). No. 2 lies on the extreme anterior 



Fig. I. Portion of left elytron and left wing of the lady beetle, Epilachna 

 borealis, showing groups i to 4 of olfactory pores, as indicated by the numbers i to 

 4; A shows relative sizes of peduncle of elytron and group of pores on peduncle 

 when compared with size of basal margin (BM) of elytron; A and B, dorsal surface 

 of peduncle of elytron, showing position of group i of olfactory pores on radial 

 plate (RP) between muscle disk (MD) and subcostal head (ScH). The lower side 

 of each drawing is the outer margin of the elytron. A, X 8; B, X 45; C, dorsal 

 surface of wing, showing position of groups 2 to 4 of olfactory pores on radius (R), 

 X 8; o, position of scattered pores on ventral side of wing on union of costa (C) 

 and subcosta (Sc) near fold of wing (Fo). Sometimes a group is found on the 

 media (Me) just below group 4. 



end of the radius and it is usually difficult to count its pores, 

 because the surface of the radius at this place is greatly arched 

 causing some of the pores to lie on the top of the arch while the 

 remainder of them lie on the side of the arch facing the anterior 

 margin of the wing. Nos. 3 and 4 are found on the radius where 

 the media (Me) joins the radius. On the right wing, No. 2 



