OF NATURAL HISTORY. 767 



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

 above the interval of the antennae, one exterior [387J to the an- 

 tennae, one each side on the clypeus, and untmnaj ben.-»th. 

 brighter towards the base, dull fulvous : mandibles on the cxt*«- 

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

 margin and transverse line behind the scutel, yellow : wing-f.calr 

 piccous, black on the inner margin : wings blackish-violaeeouH : 

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

 abruptly dilated each side ; second segment at tip with nimh 

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

 the knee, black. 



Length three-fifths of an inch. 



Diff'ers from any of the varieties of our pirn't-titius Linn . I 

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



5. O. AN0RMI8 S. (Eitmenrs) Long's second Expedition, pro- 

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

 destroyed, I cannot be certain whetlirr it mav ""t !..• u I'l, r.ili, ,'. 

 fits Klug. It is like the oculalus S. 



LET H US V. Latr. 



L. .'sriNil'ES. — Black; dypeus broader than long; first abdo- 

 minal segment somewhat white at tip. 



Lihabits Indiana. 



Body black, punctured : clypcus much wider than long : wingw 

 dark violaceous : tergum slightly punctured ; peduncle rather 

 slender, somewhat gibbous, with an indented .sjiot 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 : tibiae, posterior pairs spinous behind. [388] 



Length seven-tenths of an inch. 



Differs from L. ci/diiijn-nnis F., which it seems to rosomblf 

 most, in being smaller, more polished, having no testaccou.« at 

 base of the petiole or on the sides of the mctathorax ; the wing* 

 hl."50 are less opake. 



1-^37.] 



