348 Canadian Butterflies. 



black band, most defined at the anal angle. They have besides, 

 along the margin near the tip, four or five triangular black spots 

 placed upon the nervures. The posterior wings entirely white 

 with sometimes a small group of blackish atoms near the costa. 

 Underside of the anterior wings nearly the same as the upper but 

 the black spots rather paler. The posterior wings slightly tinged 

 with yellow and with a blackish spot upon the edge of the dis- 

 coidal cell. They are also marked by a marginal mark formed of 

 blackish atoms hardly distinguishable from the ground colour. 

 Antennae black, tipped with white ; abdomen greenish black. 



The female is distinguished from the male, whicli we have just 

 described, by the following characters : the black on the anterior 

 wings above, is more intense, and underneath, they are a little 

 tinged with green at the tips ; the posterior wings on the upper 

 side are white a little tinged with greyish, and the hind margin ' 

 blackish, and marked with five or six white trapezoid spots ; their 

 underside has the nervures greenish brown, and a marginal band 

 of the same colour. 



Boisduval says this pretty species is rather rare. It appears in 

 the spring, and about the end of June, round New York. It is 

 also found in Connecticut, and we have strong reasons to believe 

 it occurs in the neighbourhood of Montreal. Having now de- 

 scribed all the Canadian species of the first family of Diurnal Le- 

 pidoptera we reach the second the Heliconiidse, which, however, is 

 represented in this countr}- by a single species only. 



FAMILY 2. HELICONIID^. 



This family may be easily distinguished from the preceding, by 

 having the anterior part of legs very small or rudimentary in both 

 sexes, and folded up, not being fitted for walking. They thus 

 appear to have but four legs and are termed tetrapods (four-footed.) 

 The joints of the anterior tarsi are very indistinct, and very 

 slightly dentated at the extremity. In some genera, however, the 

 first part of legs, though small, has nearly the same structure as * 

 the others. The tarsal ungues or claws of the hind legs are sim- 

 ple, large, and very strong. The antennae are long, and placed 

 close together at the base, and in general have the club very gradu- 

 ally formed and elongated ; in some species they are almost fili- 

 form, whilst in a few others the club is rather abruptly clubbed. 

 The palpi are wide apart, slender, cylindrical, rather short, 

 and densely clothed with hair-like scales ; the terminal joint gene- 



