OF NATURAL HISTORY. 0^7 



Body black : head with j-ollow hypostoma, orhits and choeks : 

 thorax with a hne before the wings, two slender parallel lines, 

 nearly as long as the disk, on the middle, wing-scale, and often 

 a short line between the wing and scutel, yellow : scutel yellow : 

 wings tinged with fuliginous; sceond cubital cellule pentagonal, 

 the anterior recurrent nervure with a short process near the mid- 

 dle : metathorax with a short transverse line at tip of the scutel 

 and two dilated longitudinal spots, yellow : tergum with a dilated 

 yellow band on each of the segments, the '2d and .'Jd widest : feet 

 yellow, or honey-yellow. 



9 with a whitish annulation rather beyond the niiddk- line of 

 the anteinuv. 



Length half an inch. 



Resembles the preceding, but differs in many characters, as 

 the two descriptions will prove. 



S. I. NAVUS. — Black; orbits, line before the wings and lateral 

 margin of the scutel, yellow. 



Inhabits United States. 



9 Body greenish-black; head with narrow yellow orbits: palpi 

 dull yellowish : thorax with a slender line before the wings yel- 

 low : wings a little fuliginous ; nervures fuscous : scutel with a 

 yellow lateral margin : metathorax with a line beneath the scutel 

 generally interrupted into two distant dots : thighs at base and 

 tip, tibii« at tip, and tarsi, with a slight tinge of piceous : an- 

 tenna) annulate. [230] 



% Hypostoma and mouth yellow : feet with the thighs at base 

 and tip, tibiaj at tip and base of the joints of the tarsi, dull yel- 

 lowish. 



Length from nine-twentieths to three-fifths of an inch. 



May be distinguished from hrciin'nctor, uni/asriatori'us, and 

 otiosiis nob. by its black scutel ; and from morulus aud mahcm 

 nob. by having a yellow line before the wings. 1 have found it 

 in Pennsylvania, Indiana and Louisiana. 



0. I. DEVINCTOR nob. Amer. Entom. vol. ii. [Ante, 1, 4!^.] 



It varies in having the scutel black and the feet entirely black. 

 Another variety has the tibiae and tarsi ferruginous. My 

 largest specimen was sent to me by Dr. Harris. 



Inhabits Indiana. 

 183o.] 



