THE CANADIAN ENTOMOLOGIST. 235 



gives for Speyeria as 40 per cent, of length of wing, for Argy tints as " con- 

 siderably less than " 50, and for Bretithis as ." nearly " 50. The 

 measurements give for Speyeria 40.5 to 46.1, for Argynnis 39.3 to 47.6, 

 and for Brenthis 39.7 to 48.7, the average of the 26 specimens of Argyn- 

 nis being 44.5, and of the 13 of Brenthis 44.1. 



Hence we find that out of all the characters given in the Revision as 

 separating these three genera, there are none that divide Speyeria from 

 Argynnis, and but a single peculiarity separating Argynnis and Brenthis, 

 and that sometimes varying fifteen hundred per cent, from the numerical 

 ratio assigned to it, leaving out of account, for the present, the number 

 of joints in the antennae, which I have not been able to investigate as yet. 

 In venation and length of cell, Euptoieta claadia agrees with Brenthis, 

 being about midway between bellona and myrina, so that though we might 

 be inclined to accept this character as sufficiently separating Argynnis and 

 Brenthis, the latter group would need further limitation to exclude 

 Euptoieta. The Melitaeas and Phyciodes also have the second branch 

 outside the cell. 



A table is appended giving these measurements reduced to percent- 

 ages, for Speyeria, Argynnis and Brenthis, showing how extremely variable 

 the species and individuals are, and that such proportions are not in any 

 wise to be depended on even for specific characters. A large number of 

 measurements have been made in the genera Phyciodes and Melitaa, but 

 these results must be reserved for a later paper, since their reduction and 

 comparison will require considerable time, and since a number of 

 additional measurements remain to be made in order to complete the 

 series. 



TABLE. 



(Abdomen = 1.) 



Length Antenna. B. bellona. ... 1.15 



A. atlantis . . , 1.2 1 



A. cybele 1.21 



A. atlantis 93 B. myrina 1.21 



A. aphrodite 1.06 A. aglaia 1.24 



A. Bremnerii 1.08 A. aphrodite 1.26 



A. aphrodite 1. 11 " 1.33 



S. idalia 1.12 B. euphrosyne 1.37 



" 1. 13 B. freya 1.42 



A. cybele 1.13 B. epithore 1.44 



