32 BUTTERFLIES OF MAINE. 
State, and does a vast amount of damage, feeding as it does 
on clover, one of our prominent and valuable forage plants. 
A few years ago I made as careful an estimate as I could of 
the number on the college farm, their progeny and the 
amount they would eat, and was led to conclude that they 
destroyed not less than twenty-five per cent of all the clover 
growing in the field. The opinion prevails that they do little 
or no harm, but this is a very grave error. 
Parasites play an important part in holding them in check, 
and our insect-feeding birds, as the robins and sparrows, are 
extremely useful in destroying them, and should be fully 
protected from men, boys, cats, shrikes, kingbirds and all 
other tyrants. 
6. COoOLIAS INTERIOR, Scud. 
Co’-li-as in-te’-ri-or. 
Expanse of wings, 2.25 inches. 
This species was described from specimens taken at Cape 
Breton island, and one from Waterville, as Colias philodice, 
var. laurentina, but Mr. W. H. Edwards considers it to be 
identical with Colias interior. : 
The males closely resemble those of C’. philodice, except 
that the sub-marginal row of dots on the under side of the 
wings is entirely wanting in both sexes, and the terminal 
black band of the fore wings does not reach the hinder mar- 
gin, and is almost wholly wanting on the hind wings of the 
females. 
7. Trrtas isa, Bd-Lec. 
Té'-ri-as li’-sa. 
Expanse of wings, about one inch and a quarter. 
Upper surface of the wings sulphur yellow, the fore wings 
sprinkled with black atoms at the base and along the costa, 
and a small black discal point rests on the end of the cell. 
There is also a large dark brown apical patch on the fore 
