OF NATURAL HISTORY. 727 



Body somewhat polished, impunctured, black : antenna? dusky, 

 honey-yellow towards the base : mandibles honey-yellow ; thorax 

 with the anterior segment not much elongated ; dorsal impressed 

 lines very obvious : wings hyaline ; radial nervure extended, 

 eqi;ally distinctly near to the tip of the wing ; discoidal cellule 

 none : metathorax minutely and densely punctured or granulated 

 above, and minutely lineated each side : abdomen depressed, 

 polished, piceous black, distinctly petiolated : feet honey-yellow : 

 thighs a little dusky in the middle. 



Length over one-twentieth of an inch. 



This is the smallest species I have met with. 



3. B. PEDATUS. — Black ; antennae and feet honey -yellow. 

 Inhabits Indiana. 



Body black, with scattered hairs : antennae, particularly at 

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

 punctured : metathorax punctured and lineated : tergum 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. [281] 



4. B. CENTRATUS. — Black ; tarsi and tip of the tibiae obscure 

 piceous. 



Inhabits Indiana. 



Body black, polished, with scattered hairs : antennae with an 

 obsolete piceous tint, excepting the basal joint : metathorax with 

 discoidal 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 ; 

 nervures pale : tergum polished : tibiae and tarsi obscure pice- 

 ous ; the latter blackish at tip. 



Length less than three-twentieths of an inch. 



This species is considerably larger than the preceding and 

 diff"ers in the color of the antennae and of the feet. 



COPTERA nob. 

 Artificial character.— Wm^s without nervures ; superior wings 

 folded and with a fissure at tip ; abdomen of two segments. 

 1835.] 



