234 THE CANADIAN ENTOMOLOGIST. 



viz., 52 for Speyeria, 41 to 49 for Argynnis, and 33 to 34 for Brenthis. 

 This matter I have not investigated. 



The palpi and eye are compared, the length of the eye being taken as 

 unity ; in Speyeria they are stated to be 1.50, in Argynnis 2 — to 2, and 

 in Brenthis 2 — . I find Speyeria 1.29, Argynnis 1.07 to 1.60, and Brenthis 

 T.33 to 2. 



The fore tibiae are compared with the hind tibiae, being as .33+ in 

 Speyeria, .40^ or .40+ $ in Argynnis, and .50 — $ or 50 $ in Brenthis. 

 I find Speyeria .36, Argynnis .40 to .45, and Brenthis .29 to .44. 



The tarsi are said to be scarcely shorter than the tibiae in Speyeria, in 

 Argynnis .75 + ; I find for Speyeria .80, and for Argynnis .80 to .88. 



The middle tibiae are said to be " a little shorter than the hind pair " in 

 Speyeria and Argynnis, " scarcely shorter " in Brenthis. I find for Spey- 

 eria .89, for Argynnis .85 to .96, and for Brenthis .81 to .93. 



The 1st superior branch of the subcostal nervure is said to arise in 

 Speyeria " beyond the middle of the outer half of the upper margin of 

 cell" (/. e., at 25 per cent. — , inside apex) ; in Argynnis " in the middle 

 of the outer two-fifths of the upper border of cell " (/. e., at 20 per cent, 

 inside apex) ; and in Brenthis " shortly before the apex of the cell." For 

 Speyeria! find 22.1 and 24.; for Argynnis a range of from 13.5 to 23.6, 

 and for Brenthis from 2.6 to 17.5. In a single species of Argynnis, viz., 

 atlantis, I find in 10 specimens taken at random the surprising variation 

 of from 14. to 23.6. 



The next character is the only one among all those given for these 

 three genera that I have been able to verify from specimens, and even 

 here the variability is startling. 



Mr Scudder gives the second branch of the subcostal as arising in 

 Argymiis at " halfway between the 1st and the apex of the cell " (/. e., at 

 50 per cent.) and in B?-enthis as at a similar distance beyond it (i. e., at 

 100 per cent, beyond). For Speyeria no corresponding character is given. 

 I find in all specimens which I have examined that this 2nd branch is 

 given off in Argynnis within the apex, and in Brenthis beyond it, but the 

 precise point varies in Argynnis from 55.6 to 15.0 per cent, within apex, 

 and in Brenthis from 114. to 1500. per cent, beyond it, Mr. Scudder's 

 unit (the distance between the origin of 1st branch and apex of cell) 

 being adopted. 



The last characters relate to the length of cell, which the Revision 



