122 ZYG.ENID.E AND BOMBYCID.K 



spot on the costa opposite the discal vein, an outer smaller costal spot 

 of the same color, one at the anal angle (often obsolete), one on the 

 inner margin, and a slender whitish streak at the base of the wing be- 

 neath the median vein. Fringes concolorous. 



Posterior wings bright orange red, dusky on the inner margin, with 

 a broad blackish outer margin, which shows a tendency to break up 

 into spots in many specimens. Fringes yellowish. 



Beneath, all the wings are yellow, suffused with scarlet towards the 

 base. On the posteriors the markings are reproduced only more 

 dimly ; on the primaries the costa is whitish, and the apex and outer 

 margin show a dusky cloud, enclosing a light costal spot near the 

 apex. 



$ . — Similar to the 3 above, except that the secondaries are redder, 

 while the base of the wings is largely blackish, and the black outer 

 marginal band is produced along the costa to the base. Fringes of 

 secondaries dusky. Beneath, the wings are entirely red, with faint 

 orange tinges, the costa, apex, inner and outer margins being dusky 

 brown, on the primaries. On the secondaries the black at the base 

 disappears, otherwise the markings are as above, but of a brownish 

 hue. In some Oregon specimens, all the shades are more intense 

 (fig. 15), the whitish spots are fused into a whitish transverse band, 

 while the secondaries are more largely and intensely black. Beneath, 

 the primaries are as previously described, except that the margins of 

 the wing are black instead of brown ; and the secondaries are so 

 largely black, that the red color is reduced to a few broken 'median 

 spots. 



Expanse of wings, $ 1.15, ? 1.50 inches. Length of body, 0.45 to 

 0.50 inch. 



Habitat. — Oregon (Lord Walsingham). California, (Edwards, 

 Stretch.) 



Boisduval's description of Lithosia decia corresponds very well with 

 the insect described above, and I have no hesitation in retaining his 

 specific name. This species appears to be common in Oregon, as 

 evidenced by the long suite taken by Lord Walsingham, to whom I 

 am indebted for the specimen figured on Plate 5, fig. 15. In Califor- 

 nia it is less abundant than either of its two allies, though like them 

 widely distributed. Of its transformations nothing is known. The 

 perfect insect appears in May, is single brooded, and not difficult to 



