ZYGAENIDAE CASTNI1NAE ARCTIA YARROWII. 801 



much narrower ; all of these extend only to the median vein; the fourth 

 is narrow, though wider than the third, and extends across the wing to the 

 anal angle as an irregular band, being toothed outwardly about the middle 

 at the point where it receives the termination of the fifth short irregular 

 spot or band; below the submeclian vein, near the base of the wing and 

 opposite the costal spots 1 and 2, are two small, very reduced spots ; and 

 from the middle of the inner margin springs a very narrow, curved band, 

 which unites with the middle of the fourth spot, forming with it and the 

 fifth the usual terminal Arctian markings. The disposition of these mark- 

 ings is more like that of E. caja or N. plantaginis than any of the strictly 

 American Arctians. 



Posterior wings full, rounded, rather thinly scaled ; basal half black, 

 bounded outwardly by an irregular line extending from the basal two-fifths 

 of the costa to the anal angle. Outer half orange-scarlet, inclining to orange 

 near the apex. Fringes lemon-yellow. This outer half contains a small 

 black spot on the discal vein, and a subinarginal row of three larger black 

 spots. The first of these lies across the interspace above the first median 

 nervule ; the second across, the fourth median nervule ; and the third, on the 

 submedian vein close to the outer margin. There is besides a very narrow 

 marginal spot about the middle of the outer margin. 



Beneath, the markings are reproduced ; those on the primaries, espec- 

 ially near the apex, being broader and more diffuse. All the light portion of 

 the primaries, except near the apex, are suffused with crimson; this color 

 being most intense near the base and along the subcostal vein. The sec- 

 ondaries are somewhat paler, and there is a crimson streak on the basal 

 third of the costa, which does not appear above. Expanse of wings, 1.75 

 inches. Length of body, 0.80 inch. 



HAB. Arizona. 



9 . Unknown. 



This species, without exception the most beautiful of the American 

 Arctians, cannot be mistaken for any other. It belongs to the section iu 

 which the veins are not clearly marked with a distinctive color. The body 

 reminds one of Epicallia virginalis, Boisduval, the under wings suggest the 



9 variety of Nemeophila plantaginis with red secondaries, while the orna- 

 51 z 



