178 PROCEEDINGS OF THE ACADEMY OF [1885. 



As far as they are known the females of the red species of 

 Agrias mimic in an extraordinary manner the females of certain 

 Catagrammas, and the blue ones the same sex in some of the 

 species of Callithea. 



Plusia corusca. 



Size and shape of Mortuorum Guen. Head and body pale 

 brown, inclining to ochrey beneath- 

 Upper surface. Primaries, ground color brownish pink ; sinuate 

 white or silvery basal and transverse anterior lines edged irregu- 

 larly with deep bronzy brown ; a transverse posterior line, this 

 latter is broken, irregular, of exceeding fineness, and edged at 

 intervals with deep brown ; the space between this line or band 

 and the transverse anterior line, and between the median nervure 

 and inner margin is a deep golden or coppery bronze, according 

 to the light in which it is seen, the same shade occupies most 

 of the space between the submarginal, which is pink and sinuate, 

 and the transverse posterior line, and also covers, except at inner 

 angle, the space between the former and the exterior margin ; a 

 large and very distinct gamma mark as in P. gamma L. 



Secondaries brownish, pale and ochraceous at basal half, and 

 smoky on outer half. 



Hab. — Colorado. One example, Mus. Strecker. 

 Though in detail the markings are somewhat different, still this 

 insect forcibly reminds one of P. mortuorum, were the silver 

 ground of the latter to be replaced by coppery bronze the resem- 

 blance would be very strong. 



Plusia alterna. 



Expands If inches. Allied to Ampla Wlk., but entirely dis- 

 tinct, all wings narrower than in that species, and primaries not 

 as much produced at inner angle. Head and thorax light ashen 

 or purplish gray; patagia? with broad, dark brown margin, which 

 color forms a continuous band across the back. Abdomen light 

 brown. 



Primaries of an even, shining pale, somewhat purplish gray, and 

 without the shading and clouding of outer half as in Ampla ; a 

 large dark space interior to the median nervure, and between the 

 transverse anterior and posterior lines, this space is a dark rich 

 brown, shading into black at upper part where it is outlined by a 



