OP NATURAL HISTORY. ygy 



Body black, punctured: head, short line behind the eye dot 

 above the interval of the antenna, one exterior [3871 to the an 

 tenn^ one ea.h side on the clypeus, and antenna beneath^ 

 brighter towards the base, dull fulvous : mandibles on the exte- 

 rior margin, honey-yellow; thorax, bilobed spot on the anterior 

 margin and transverse line behind the scutel, yellow: win-scale 

 piceous, black on the inner margin : wings blackish-violaLus • 

 tergum, first segment on the posterior margin with a yellow band 

 abruptly dilated each side; second segment at tip with much 

 larger and 'confluent punctures: feet orange: thighs, except at 

 the knee, black. 



Length three-fifths of an inch. 



Differs from any of the varieties of our jiarietinus Linn., I 

 have seen, though it is nearly allied to that species. 



5. 0. ANORMIS S. (Eumenes) Long's second Expedition, pro- 

 bably belongs to this genus, but as the head of my specimen is 

 destroyed, I cannot be certain whether it may not be a Pferochei- 

 lus Klug. It is like the oculatus S. 



♦ 

 LETHUS F. Latr. 



L. SPINIPES. — Black; clypeus broader than long; first abdo- 

 minal segment somewhat white at tip. 



Inhabits Indiana. 



Body black, punctured : clypeus much wider than long : wings 

 dark violaceous : tergum slightly punctured ; peduncle rather 

 slender, somewhat gibbous, with an indented spot above, near 

 the tip, terminal margin with a piceous, dentate band ; second 

 segment with a distinct neck at base ; posterior margin abruptly 

 and smoothly impressed ; and with the remaining segments im- 

 maculate : tibias, posterior pairs spinous behind. [388] 



Length seven-tenths of an inch. 



Differs from L. cyanipennis F., which it seems to resembh> 

 most, in being smaller, more polished, having no testaceous at 

 base of the petiole or on the sides of the metathorax ; the wing.s 

 also are less opake. 



1837.] 



