358 APPENDIX. 



it occurred on a window in Philadelphia on the 131h oi 

 September. 



PSYCHODA, Latr. 



P. alternata. Wings acute at tip, with a small black 

 spot at the tips of the nervures. 



Inhabits Pennsylvania. 



Body pale yellowish-white; abdomen dusky; wings 

 ovate-lanceolate, acute at tip, cinereous with an obsolete 

 pale band on the middle and base ; the alternate nervures 

 of the posterior margin at their tips and the tips of the 

 nervures of the anterior margin, with a black spotj spots 

 of the posterior margin more distinct. 



Length to the tip of the wings more than one-tenth of 

 an inch. 



A very common little insect, even in Philadelphia. It 

 may be readily distinguished from other species by its 

 more acute wings, as well as by the arrangement of the 

 spots and bands, however obsolete, which exist on these 

 organs. 



LIMNOBIA, Meig. 



L. argus. Yellowish-white ; head black j wings ocellate 

 and marbled with blackish. 



Inhabits North-west Territory. 



%^ntennsa moniliform; thorax pale yellow-piceous, 

 whitish near the neck ; wings hyaline, with a double se- 

 ries of large, pupilate ocellse, those near the tip confused ; 

 ultimate nervure furcate ; poistrs fuscous, at tip white ; 

 CQXSR whitish J thighs annulate with black near the tip. 



Length % 9 more than three-tenths of an inch. 



