AMERICAN ENTOMOLOGY. 49 



by the white spot behind the tip of the scutel, and by the two 

 between the anterior wings. 

 The lower right figure. 



Ichneumon centrator. — Specific character. Black ; an- 

 tennae annulate ; scutel, and disk of the thorax, ferruginous. 



Desc. Body black : head dull ferruginous, with a polished, im- 

 pressed, black line at the base of the antennae : antennas with a 

 white angulation, beginning at the seventh joint, and extending 

 to the seventeenth : thorax with the disk between the anterior 

 pair of wings and the scutel, dull ferruginous : tibiae dull rufous, 

 excepting at tip : wings dusky violaceous. 



Obs. It occurs frequently in Pennsylvania, and as I have found 

 it both in Missouri and the North-Western Territory, it appears 

 to be a pretty general inhabitant of the United States. 



The lower left figure. 



Ichneumon brevicinctor. — Specific character. Black; scu- 

 tel and the very short band on the antennas, white. 



Desc. Body black : head immaculate : antennae with the white 

 annulus beginning at the seventeenth joint, and extending to the 

 twenty-first : thorax immaculate : scutel yellowish-white : wings 

 a little dusky : knees and tibiae of the anterior pair of feet, dull 

 rufous. 



Obs. In form and general appearance, it resembles unifascia- 

 torus nob., but the different individuals correspond in having the 

 annulus of the antennae very short, and commencing at the seven- 

 teenth joint; in having no spot beyond the tip of the scutel, in 

 having the head immaculate, &c. It also resembles nigratoriut 

 Fab., but is much smaller, and is altogether destitute of orbital 

 lines. 



The upper left figure. 



LIMENITIS. Plate XXIII. 



Papilio Lin. — Nymphalis Latr. 



Generic character. Antennae gradually clubbed; club slender, 

 hardly compressed, elongate-obconic ; palpi not elongated, second 

 joint not much compressed, the anterior margin not remarkably 

 broader ; anterior pair of feet spurious ; wings not very much 

 longer than broad ; four hinder feet with double nails ; abdomen 



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