Lepidopterologlcal Contributions. 367 



from that species in the conformation of the scarlet patches on 

 the primaries, while no mention is made in Mr. "Walker's 

 description of the subcostal metallic scales, or of the white 

 thoracic patcli beneath, extending inwardly on the anterior 

 femora, which are prominent characters in the species we have 

 just described. 



Fam. BOMBYCIDAE. 



Sub-fam. ARCTIIDAE. 



Arctia, Schrank. 



Arctia mexicana, n. s. 



(Plate 13, Fig. 3, $ ) 



Size, moderate; anterior wings, black, with broad, very pale yel- 

 low bands ; a broad, yellowish longitudinal band, narrowest at the 

 base, runs beneath the median nervure from extreme base of the 

 wing to internal angle, and is obsoletely furcate at the margin. 

 First transverse band (at basal third) irregular, being broadest at 

 costa, narrowing to the central longitudinal stripe, where it ia 

 slightly angulated, and beneath which it is most constricted, widen- 

 ing irregularly to internal margin. A median, slightly flexuous, 

 similarly colored band, of everywhere nearly equal width. Very 

 approximate to and beyond the median band, is a third, slightly 

 more flexuous, and wdiich, with accessory bands which issue from 

 it, forms a figure resembling the letter K, with the straight stroke 

 turned towards the base of the wing, and the upper limb, attain- 

 ing external margin, reflexed to costa before the apex ; the lower 

 limb resting on the extremity of the central longitudinal stripe at 

 external margin. Costal edge, entirely pale yellow, nowhere 

 encroached upon by black scales. External and internal margins 

 narrowly bordered and fringed with pale yellow scales. Under 

 surface reflecting the ornamentation of upper surface, and resem- 

 bling it in coloration ; tho costal edge is shaded with brighter, 

 somewhat orange-colored scales. 



Posterior wings, testaceous, yellowish, with a terminal series of 



OCTOBER, 1866. 27 Ann Ltc. Nat. Hist. Vol. VIII. 



