1881.] Lntomotogy. . 573 
dut, P. atalanta, Pieris oleracea, Argynnis atlantis, A. myrina, Van- 
essa milbertit, Grapta faunus, Lycena lucia, Colias erytheme, var., 
keewaydin, Argynnis lapponica, A. tarquinius, A. bellona, Papilio 
glaucus var. turnus, Limenitis arthemis var. lamina, and Phyciodes 
tharos. Mr. Weir concludes his paper with the following re- 
marks: “ The collection of which I have now given a description, 
small as it is, is not wanting in interest. It is surprising to con- 
template the time which must have elapsed since the three identi- 
cal with European species had a common ancestor, and yet the 
difference now existing is too slight to consider them even varie- 
ties of each other. A former connection with Europe by the 
Faroe islands, Iceland and Greenland no doubt existed, and during 
one of the periods of mild Arctic climate the transmission of 
species from one continent to another was effected. We are so in 
the habit of calling this hemisphere the old world, that it does 
not occur to us that it is just as likely that Vanessa antiopa passed 
rom America to Europe, as that the converse was the case.” 
Unfortunately the three species referred to ( Vanessa anttopa, 
Pyrameis cardu and P. atalanta) are the very poorest that could 
be chosen as indicating length of time required for variation of 
forms that have become separated by wide expanse of ocean. 
hey are cosmopolitan butterflies, all known to be capable of 
extended flight, and it seems to us that the constancy they exhibit 
in different quarters of the globe is explicable rather on frequent 
and recent migration from one part of the world to another. 
Trape IN InsEcrs.——It is a well known fact that sixty or more 
years ago exorbitant prices were paid for rare insects, or at least 
for species that were considered rare. Since that time the mar- 
ket price for insects has been constantly on the decline, and at the 
Present time a vast number of species of the two favorite orders, 
Lepidoptera and Coleoptera, can be had through reliable dealers at 
2£. macleayt, 3 E. cantori and 3 LE. hardwicku brought 48; gee 
Ants Injurtous in Arizona.—Mr. H. H. Rusby, of Clifton, 
Arizona, sends us a rather doleful account of the destruction 
Wrought by ants in that Territory. He says the country 1s one 
Vast ant colony, and that the ants prove the greatest drawback to 
