40 N. E. McINDOO 



pores are well grouped. This fact chiefly explains the variation 

 in the number of groups of pores. Two specimens examined 

 (Nos. 16, 18) have only two groups on each front wing and one 

 group on each hind wing; three specimens (nos. 15, 17, 26) 

 have three groups on each front wing and two on each hind 

 wing; 11 specimens (nos. 1, 3, 5, 6, 8, 9, 11, 12, 19, 20, 43) have 

 three groups on each front wing and three on each hind wing; 

 one specimen (no. 25) has four groups on one front wing and two 

 on the other, two groups on one hind wing and one on the other 

 hind wing; two specimens (nos. 10, 22) have four groups on 

 each front wing and two on each hind wing; six specimens (nos. 

 13, 14, 21, 23, 24, 28) have four groups on each front wing and 

 three on each hind wing; ten specimens (nos. 7, 27, 31, 33 to 

 37, 41, 42) have four groups on each front wing and four on 

 each hind wing;, two specimens (nos. 39, 40) have four groups on 

 each front wing and five on each hind wing; three specimens 

 (nos. 29, 30, 32) have five groups on each front wing and three 

 on each hind wing; two specimens (nos. 2, 4) have five groups 

 on each front wing and four on each hind wing; and one speci- 

 men (no. 38) has seven groups on each front wing and four on 

 each hind wing. Of the 15 specimens of butterflies examined 

 it is thus seen that each of 15 has 16 or more groups of pores 

 on both pairs of wings, while of the 28 specimens of moths ex- 

 amined each of 24 has 14 or less groups on both pairs of wings. 

 This indicates that the olfactory pores in butterflies are the 

 more highly developed. 



Practically every specimen examined has at least a few scat- 

 tered pores on the wings, and, as a rule, the fewer the groups of 

 pores the greater is the number of scattered pores. It is com- 

 mon for the pores to extend the full length of one or more veins 

 and to terminate at the distal ends of the veins in pairs as shown 

 in figure 1. 



Every leg of the specimens examined bore pores, but the more 

 the legs are reduced in size the fewer the pores they bear. The 

 disposition of the pores on the trochanters and femurs of a few 

 of the species is similar to that of the honey bee, but only occa- 

 sionally are pores found on the proximal ends of the tibiae and 



