THE CANADIAN ENTOMOLOGIST. 235 



of any other crevice or opening which promised the requisite shelter. The 

 colonies of the Formica are much more numerous than those of the 

 Myrmica, and the species varies so in color — from those in which the 

 workers are of a dull dead black to those in which the thorax is of a honey 

 yellow — that I at first thought there were three species. I became con- 

 vinced, however, that there is but the one species. Each formicarium 

 contained one % and a number of larvae, while the number of workers in 

 some was less than a dozen ; in others it rose to more than a hundred. 



ON THE GENERA NOLA AND ARGYROPHYES. 



BY A. R. GROTE, 



Director of the Museum, Buffalo Society Natural Sciences. 



I have received from Canada (London, Mr. Saunders) a new and 

 easily recognizable species of Nola, larger than ovilla, and in describing 

 it, I have again gone over the characters of Aryyrophyes, which I find to 

 be allied to Nola, and not to belong to the Geonietrid^. I have corrected 

 my former observations on Argyrophyes, which I find to have been largely 

 erroneous. 



Nola sexmaculaia, n. s. 



$ $ . Fore wings with the apices produced, gray, like ovilla in color, 

 crossed by three oblique dentate and very fine black lines. Costa at base 

 marked with brown. Immediately beyond, at basal third, is a second 

 brown mark, widening inferiorly on the cell. A third and larger, sub- 

 quadrate, at the middle of the wing. These two last spots are seen to be 

 very finely edged with white on the outside. Hind wings gray with white 

 fringes and discal dot. Beneath sub-irrorate, fore wings gray, hind wings 

 white with discal dot. Expanse 19 mil. Two specimens; in the male 

 the antennae are broken off; from what remains they do not appear to 

 have been pectinate. 



