APPENDIX. 333 



numerous silvery hairs ; luings with fuscous nervures ; a 

 fuscous band including nearly all the radial cellule, and 

 not reaching the posterior angle; tip slightly margined 

 with fuscous; posterior thighs and tibiae at base rufous; 

 abdomen sessile, first and second segments rufous. 



Length about three-tenths of an inch. 



2. P. marginatus. Black; wings dusky, with abroad, 

 darker posterior margin; abdomen sessile, first and se- 

 cond segments rufous. 



Inhabits North-west Territory and Missouri. 



9 The terminal dark margin of the wings is so broad 

 as to reach almost to the terminal cubical cellule, and 

 passes round on the costal margin to the origin of the ra- 

 dial cellule; on the inferior wings is also a broad, terminal, 

 darker margin. 



Length two-fifths of an inch. 



Very similar to the preceding, but manifestly distinct by 

 the above characters. f 



CEROPALES, Latr. 



1. C./asciata. Black ; thorax and tergum spotted and 

 banded with pale yellowish; feet ochreous, tarsi pale yel- 

 low. 



Inhabits United States. 



Front, labrum, and orbits yellow, the latter interrupted 

 above; thorax punctured; anterior margin, a spot each side 

 near the head, a longitudinal, abbreviated, central line, yel- 

 low; scutel with a spot on the disk, and another transverse 

 one beneath its tip, yellow ; wings immaculate, nervures 

 blackish; pectus with a yellowish spot over the interme- 

 diate and another over the posterior feet; coxae, first joint 

 with a dilated yellow line; posterior feet elongated; ter- 



Vob. IF. 43 



