Genus Brenthis 



FIG. 90. Neuration 



which is characteristic of the latter genus, is altogether lacking 

 in Brentbis. 



Egg. The eggs are subconical, almost twice 

 as high as wide, truncated at the top, and 

 marked with thirteen or fourteen raised longi- 

 tudinal ridges connected by a multitude of 

 smaller cross-ridges. 



Larva. The caterpillars are not noticeably 

 different in their general appearance from those 

 of the genus Argynnis, except that they are 

 smaller and generally not as dark in color as 

 the larvae of the latter genus. They feed, like 

 the caterpillars of Argynnis, upon violets. 



Chrysalis. The chrysalis is pendant, about 

 six tenths of an inch long, and armed with 

 two rows of sharp conical tubercles on the 

 back. 



(i) Brenthis myrina, Cramer, Plate XV, Fig. i, 3 ; Fig. 2, 

 3, under side; Plate V, Figs. 12-14, chrysalis (The Silver- 

 bordered Fritillary). 



Butterfly. The upper side of the wings is fulvous; the black 

 markings are light, the borders heavy. The fore wings on the 

 under side are yellowish-fulvous, ferruginous at the tip, with the 

 marginal spots lightly silvered. The hind wings are ferruginous, 

 mottled with buff. The spots, which are small, are well sil- 

 vered. Expanse, $, 1.40 inch; ?, 1.70 inch. 



Egg. The egg is conoidal, about one third higher than wide, 

 marked by sixteen or seventeen vertical ribs, between which are 

 a number of delicate cross-lines. It is pale greenish-yellow in 

 color. 



Caterpillar. The caterpillar has been carefully studied, and 

 its various stages are fully described in "The Butterflies of New 

 England," by Dr. Scudder. In its final stage it is about seven 

 eighths of an inch long, dark olive-brown, marked with green, 

 the segments being adorned with fleshy tubercles armed with 

 needle-shaped projections, the tubercles on the side of the first 

 thoracic segment being four times as long as the others, cylin- 

 drical in form, and blunt at the upper end, the spines projecting 

 upward at an angle of forty-five degrees to the axis of the tubercle. 



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