2 AMERICAN ENTOMOLOGY. 



palpi yellowisli before ; a wliite dot behind the base of each an- 

 tenna; neck with two dots before, and a band of four dots be- 

 hind. 



Thorax black, immaculate; breast dotted with yellow; feet 

 black, anterior trochanters with an obsolete yellow dot ; superior 

 wings dark green, sometimes blackish, with whitish cvense ; four 

 or five white spots on the margin, more conspicuous beneath, 

 often obsolete above ; inferior wings highly polished, green ; six 

 pearl-white spots before the margin ; crenae white ; beneath with 

 a yellow spot at base, brownish, with a very broad polished green 

 border, upon which are seven large fulvous spots, each surrounded 

 by a black ring, and marked by a lateral white spot ; on the in- 

 ner edge about six small white dots. 



Abdomen green, a little brassy above ; a lateral double row of 

 whitish dots ; first segment with a single larger spot conspicuous 

 above. 



Female larger, color of the wings brown, with cupreous re- 

 flections. 



The PMlenw is one of the most beautiful of our butterflies, 

 and is, at the same time, very common. 



The plate represents the male in two positions. 



STIZUS. Plate II. 



Generic character. Thorax with the first segment transverse 

 linear ; feet short or moderately long ; labrum entirely exserted, 

 short, semicircular : palpi filiform, maxillary ones longer, six- 

 jointed; labial palpi four-jointed: ocelli very distinct : superior 

 wings not folded longitudinally : radial cellule one, elongated ; 

 cubital cellules three, the second narrowed before, and receiving 

 the two recurrent nervures ; the third not attaining to the end of 

 the wing. 



Ohs. Latreille formed this genus for the reception of many 

 species of the tribe Bemhecides, distinguished by the above re- 

 cited characters. These species had previously been placed in 

 the genus Bembex by Fabricius and Olivier, in that of Grahro by 

 Rossi and Fabricius, in Larra by Illiger and Fabricius, in Sphex 

 by Villers, in MelUnns by Panzer, in Liris and Srolia by Fabri- 

 cius, and by Latreille, in his earlier works, in 3Ione<Jula. 



Of all the genera which form the order Hymenoptera, the pre- 

 sent genus is the most closely allied to those of Monedula and 



