THE CANADIAN ENTOMOLOGIST. 98 



representing still the typical form, but with the brilliancy of the colours 

 greatly reduced ; these are smaller than most local Petrosa, and the 9 is 

 not more brightly coloured, but the $ has the tawny yellow ground of 

 hind wing, never found here in male Petrosa. From Saxony, from polar 

 Norway, and from northern Finland, I have the male form ffospita, in 

 which the saffron or tawny yellow ground of h. w. is replaced by white ; 

 this form approaches the local $ Petrosa by a practical concord of 

 colours. Fig. lo of the plate represents Hospita male from northern 

 Finland. Hospita is the nearest phase of Plantaginis to the Bow Valley 

 Petrosa male. Fig. 15 represents my only Asian instance of 

 Plantaginis^ a $ from eastern Siberia, an example nearer of 

 kin to the Laggan Petrosa ? than any other Plantaginis I have 

 seen. One local female corresponds so closely to this Amour 

 Plantaginis that they are separable by a single character only. This final 

 point of distinction is the apical element of the light pattern of primary, 

 the light coloured marking near apex of f w., exterior to the oblique bar. 

 The apical element seems to be persistent in Plantaginis, but in the local 

 Petrosa it is only occasionally seen, and even when present is in most 

 cases rudimentary in degree. Fig. 14 illustrates an extreme development 

 of Petrosa, in which the apical inscription is blended with the oblique 

 bar. Even in extreme stages of the Petrosa pattern the apical element is 

 usually absent. It appears sometimes in intergrades very near to '' Scud- 

 deri." Occurrence or lack of this character, and the degree of its develop- 

 ment when present, appear not to be correlated to the degree of advance- 

 ment of the general pattern. The extensive material before me strongly 

 supports the view that Petrosa and Plantaginis are distinct species. 



Aside from the two Plantaginis figures, the plate represents a single 

 species. This conclusion is derived from examination of the caught 

 series, and independently proved in the families bred from eggs. 



Note. — As the Entomological Society of Ontario supplied the plate, 

 Mr. Bean generously presented the specimens from which it was made to 

 the Society's collection. H. H. L. 



