OK NORTH AMERICA. 113 



l.-GASTKOPACHA MILDEI, (Plate 4, fig. 12). 



6 . — Thorax and patagia densely clothed with pale short rusty hairs, 

 slightly mingled with pale grey. Abdomen above and below reddish 

 brown, faintly banded with greyish, largely and squarely tufted. 



Anterior wings deeply emarginate at the anal angle, rusty brown 

 with three indistinct bands of blackish tint, consisting of spots divided 

 by the reddish veins. The basal line is short and scarcely reaches liic 

 inner margin ; the outer one extends from the emargination to the a{)ex 

 in nearly a straight line ; the central line is nearly equidistant between 

 the other two, slightly sinuated, and strongly angulated near the costa, 

 which is reached about the outer third. The terminal space is thickly 

 powdered with greyish scales, giving it somewhat a dusky shade. The 

 costal and inner margins are rather darker than the disc of the wing, 

 the nervules being of a paler tint and clearly marked. Between the 

 basal and middle row of spots, there are also two others placed tran; - 

 versely in the discal space. 



Posterior wings strongly emarginate on the costa, rounded, blackish 

 grey, powdered with rusty scales, and crossed by a narrow transverse 

 sinuated darker band, followed outwardly by an indistinct pale reddish 

 shade. The basal half is slightly redder than the apical half of the 

 wing. Veins narrowly clothed with rusty scales. Fringes on all the 

 wings white interrupted by dark rusty brown points at the termination 

 of the nervules. 



Beneath, the anterior wings are rosy grey, pale at the base, which is 

 clothed with long whitish hairs, greyer and darker along the costa, 

 apex and outer margin. Veins not so conspicuous as above. The 

 central angulated line is blackish, unbroken and well defined. The pos- 

 terior wings are grey ; slightly rosy towards the inner margin, showing 

 .the black transverse line and a blackish cloud round the costal mar- 

 gination. 



Expanse of wings, 1.40 inches. Length of body, 0.70 inch. 



Habitat. — California. [Coll. J. Behrens. ] 



Described from one 5 in good preservation taken south of San 

 Francisco. This insect is closely allied to G. tretiiulfolia of Europe, 

 from which however it differs structurally in the rounded instead of 

 acute apex of the primaries, which makes the wings proportionally 

 broader. The wings both above and below have many grey scales, 

 which only appear very faintly on the outer margin of the primaries 



