18G4.] Ill 



of the markings appear through. lu the middle of the wing are two 

 obscure yellow spots, the upper one in the 3rd m. interspace. Two 

 smaller ones near the internal margin. Costa of the secondaries broadly 

 tinged with red. 



Length S 04. Exp. wings, 2.50 inches. 



% . Lake Superior (Harr. Coll.). River Rouge, C. W., (Saunders). 



A 9 specimen taken near the summit of Mt. Washington by Mr. 

 Scudder, differs thus : there is one more costal spot; the intra-discal spot 

 is wanting, the costo-apical spot is much larger; there is simply a dark 

 discoloration instead of the spot under the origin of the 4th m. The 

 two small dots in the middle of the median band on the S secondaries 

 are wanting in Mr. Scudder's 9 . Beneath, the costo-apical spot is 

 present, the one below single. The extra-discal dot is geminate. The 

 middle of the wing and internal angle are orange yellow, and the costal 

 region of the secondaries is broadly tinged with orange. 



Length 1 inch. Exp. wings 2.90 inches. 



These differences are, without doubt, sexual, for the sexes of the 

 European broad wings Arctians differ greatly. 



Platarctia borealis. 

 Arctia borealis Moschler, Beitriige zur Lepidopteren-Fauna von Labrador 

 (Wien. Ent. Monatsl. Bd. 4. Taf. 9, f. 3. Nov. 1860). 

 9 . Head : vertex above and between the antennae deep vermillion ; 

 front below brown, as in P. parthenos. Palpi reddish, outer half brown. 

 Base of prothorax deep yellow, continuous with a broad yellow stripe 

 at the lower edge of the patagia, forming a continuous band on each 

 side of the thorax above the insertion of the wings which meets in 

 front : while in P. parthenos these two lateral bands do not meet in 

 the mesial line. Meta-thoracic hairs pale vermillion. 



Primaries brown with large straw-yellow spots. A basal longitudinal 

 spot just below the origin of the median nervure which is swollen at 

 its outer end. A costal rather large square spot on the inner fourth 

 of the costa, and opposite the end of the long baso-median spot. Be- 

 yond are three large costal spots forming the termini of the three 

 oblique bands of mostly large yellow angulated spots ; the inner con- 

 sisting of three spots, the costal being long and narrow, and the lower 

 one the smallest and opposite the baso-median spot. The second line 

 of spots is interrupted on the origin of the upper three median ner- 



