THE CANADIA.N ENTOMOLOGIST. 375 



None of these are allied botanically to E. argefitea^ but I think it most 

 likely that the larva? would take very kindly to the leaves of our common 

 Shepherdia caiiadeiisis. 



"On comparing a series of specimens of cohimbia with Columbia 

 nokomis — the Manitoba form — the difference is very obvious in the 

 brighter colours and more sharply-defined colour areas. This difference 

 may be in some measure from a difference of food, or from the much 

 longer duration of daylight while the larvae are feeding, or perhaps in part 

 from the lower temperature in winter. And perhaps it may yet be 

 shown that the North and Northwest Territorities are the normal habitat 

 and 7iokomis the normal form of the species, differentiated ages ago from 

 cecropia by climatical and other conditions, and that the now southern 

 form is from degenerate stragglers from the north. 



"The following points of difference may be noted between the 

 cohimhia nokomis form and the Columbia form, as represented by Ontario 

 specimens, and as compared with Smith's description of colutnbia, parts of 

 which are given in brackets. The standard of colour is Ridgeway's 

 Nomenclature of Colours. 



"Antennae, central shaft, bright reddish-brown ; pectinations, darker 

 (black) ; palpi, light liver-brown (dark maroon brown) ; dorsum of thorax, 

 bright reddish liver-brown, with a posterior pure white band (dark maroon, 

 with a short, gray band) ; under side of thorax, reddish liver-brown (black) ; 

 legs, reddish brown, pile darker (black, slightly tinged with brownish) ; 

 abdomen with alternate annuhtions, bright liver-brown and pure white 

 (black and dirty white). 



"Primaries above with a rather sharply-elbowed pure white line 

 (grayish-white) ; the middle area of the wing is bright reddish liver-brown 

 (dark brown), and contains a central ovate white spot (triangular) ; this 

 bright coloured area is separated from the costa by a moderately wide 

 longitudinal grayish stripe. 



"Secondaries with a large white spot at the shoulder (small, dirty 

 white) ; the central area bright reddish liver-brown (dark brown), having a 

 central white spot, which varies from kidney form to curved pear form, 

 and varying much in size, but always larger than the corresponding spot 

 on the primaries ; but no sexual difference could be observed, either in 

 the size or in the form, of these central white spots. 



"The primaries beneath have the space from the shoulder to the median 

 white cross band of a maroon-brown (black), and generally the under side 



