168 THE CANADIAN ENTOMOLOGIST.' 



tion arises at once, How did they get here ? They could not fly over 

 from Europe, nor could they cross Behrings Straits with the cold climate 

 there existing in recent times. We have historic evidence of the impor- 

 tation of but one or two species. We may surmise that others have at 

 different times made their way across through commerce. I conjecture 

 this may be the case with the Boll Worm and other species of the genus 

 Heliothis. I think that the Cabbage Fhisia, P. Ni of Hiibner, is likewise 

 an imported species. This latter insect is characterized by curious abdom- 

 inal tuftings, which no other species of the genus shares ; it is, in my 

 opinion, its strongest specific character, and it is an absurdity to make a 

 different species out of the American specimens (which have the same 

 tufting as the European) on the strength of some infinitesimal differences, 

 which, small as they are, are not even well made out to be constant. 

 Much greater differences are exhibited by the American specimens of the 

 Boll Worm ; the race which I have called iimbrostis being larger, paler, 

 more greenish or olive tinted than the European, but other specimens 

 occur also equally of a dirty ochrey, and undoubtedly equivalent to the 

 European. It is the case also with the Cabbage Butterfly, that a sulphur 

 colored variety, which has rarely been found in England, is not unfrequent 

 in America, and for aught I know the form umbroszis may also occur in 

 Europe, where, on the whole, this species of Heliothis is rare. The 

 genus Fyrrhia resembles Heliothis in general structure, but differs 

 decidedly generically by the tibii^ being unarmed, without spines or 

 claws ; the thorax is closely and thickly haired with a slight longitudinal 

 crest ; the face between the eyes is smooth, elevated. The wings are 

 pointed at the tips, and the colors are peculiar, light yellow and dark 

 orange red. We have in our fauna a species with rusty reddish yellow 

 fore wings, crossed by darker lines, which is described by Walker as 

 Exprimens, but is undoubtedly equivalent to the European P. Marginata 

 Fabr. We have then a second form, not found in Europe, occurring in 

 the Middle and Eastern States and Canada, P. Angulata Grote (=/'. 

 exprimens Speyer nee Walk.) Besides these two Eastern species we have 

 a third, P. stilla Grote, found by Prof Snow in Colorado, which has the 

 fore wings of a bright orange red, smooth, evenly colored ; the usual stig- 

 mata are wanting ; the deep brown even median shade forms a band, 

 acutely angulated on cell, strongly contrasting, diffuse outwardly ; fringes 

 with a bright red tint. The hind wings of this highly colored, lovely 

 species, are light yellow, with a blackish lunule, blackish at base and with 



