THE CANADIAN ENTOMOLOGIST, 241 



SYNOPSIS OF THE NORTH AMERICAN SPECIES. 



j Basal third of fore wings white leucobasis. 



\ Basal third of fore wings not white 2. 



j Fore wings with metallic markings green inflatella. 



\ Fore wings with metallic markings not green 3. 



j Two yellowish stripes across the outer part of fore wing, .virginiella. 

 ^' \ No yellow on outer part of fore wings 4. 



j Two clear white stripes across the fore wings oinistaiia. 



'^' I Without clear white stripes across the fore wings 5. 



f Base of fore wings marked more or less with yellow, .bjerkandrella. 

 ^' \ Base of fore wings not marked with yellow occidentella. 



C. BJERKANDRELLA (Thunb.). Dis. Ent. Ins. Suec, I., p. 24, PI. 3, Figs. 



23, 24(1784). 



silphieila, Grote, Pap., I., p. 40 (1881). 



gemmalis, Hulst, Tr. Am. Ent. Soc, Vol 13, p. 148 (1886). 



soroculelia, Dyar, Can. Ent., Vol. 32, p. 86 (1900). 

 Var. a. preiiosana, Dup., Hist. Nat., IV., p. 182, PI. 65, Fig. 9. 



australis, ZelL, Isis (1847). 



Habitat. — 111., Mo., Tex., CaJ., Ore., and Europe. 



Food. — In Europe, Inula salicina. Inula dysenterica ; Heleiiium ; 

 Cardans crispus ; Carlitia acaulis ; Verotiica. In America, Silphium 

 interrifolium (Coquillett). 



Miss Murtfeldt sent me the following notes on this species : 



"The larva is found late in June (in Missouri), and again in October, 

 mining and webbing the leaves of Gnaphalium polycepJialum. When 

 small it works chiefly between the cuticles of the leaves, but later feeds 

 externally, spinning quantities of somewhat viscid web, among which the 

 black powdery frass is profusely scattered. 



" The mature larva is 6 mm. in length by 1.5 in diameter across 

 middle segments, from which it tapers very slightly in both directions \ 

 form cylindrical, sub-moniliform. Colour translucent, whitish green, 

 immaculate. Head oblique, same colour as body, but horny and pol- 

 ished. Collar inconspicuous. Legs concolorous with general surface. 

 Before the first transformation it becomes gregarious, the larvae spinning 

 their dense white sticky cocoons, something to the number of a dozen in 

 close proximity in the general web, 



