OF NATURAL HISTORY. Tl'T 



Body somewhat polished, iiiipuucttin-d. lilack : aiitiiiii:c duskv, 

 honey-yellow towards the ba.se : iiiaiulihlfs liuiiey-yellow ; thorux 

 with the anterior segment not much elongated ; dorsjil impressed 

 lines very obvious: wings hyaline; radial uervure extended, 

 eijually distinctly near to the tip of the wing; discoidal cellule 

 none: mctathorax minutely and densely punctured or granulated 

 above, and minutely lineated each side : abdomen depressed, 

 polished, piceous black, distinctly petiolated : feet houey-ycllow : 

 thighs a little dusky in the middle. 



Length over one-twentieth of an inch. 



This is the smallest species I have met with. 



3. ]}. PEDATUS. — Black ; antenna) and feet liunoy-yellow. 

 Inhabits Indiana. 



Body black, with scattered hairs : antenme, particularly at 

 base, obscurely honey-yellow ; first joint long : thorax minutely 

 punctured : mctathorax punctured and lineated : tcrgum polished: 

 feet dull honey-yellow. 



Length over one-tenth of an inch. 



This species and the following are remarkable for the brevity 

 of the inflected tip of the radial nervure, which is not at all 

 arcuated, but points obliquely inward. [28^3 



4. B. CENTRATUS. — Bhick J tarsi and tip of the tibiao obscure 

 piceous. 



Lihabits Indiana. 



Body black, polished, with. scattered hairs: antenna) with an 

 obsolete piceous tint, excepting the basal joint : metathorax with 

 di.scoidal punctures and lineations : wings hyaline ; two brachial 

 cellules; a simple, short, oblique rectilinear inflection of the tip 

 of the radial nervure pointing towards the centre of the wing : 

 nervurcs pale : tergum polished : tibijc and tarsi ob.scure pice- 

 ous ; the latter blackish at tip. 



Length less than three-twentieths of an inch. 



This species is considerably larger than the preceding and 

 differs in the color of the anteuna3 and of the feet. 



COl'TKlt.V m)b. 

 Artificial rhnrarUr. — Wings without nervurcs ; superior wings 

 folded and with a fi.ssure at tip ; abdomen of two segnjonta. 

 1835.] 



