OF NATURAL HISTORY. 701 



nent : wings dark violaceo-faliginous ; nervures blackish ; stigma 

 honey-yellow ; second cubital cellule quadrangular, attached to 

 the radial cellule by a slightly petiolated angle ; first recurrent 

 nervure with a prominent [247] process and a small white spot; 

 second recurrent nervure much undulated, margined with white 

 one half its length ; exterior nervure of the cellule with a white 

 spot : feet, anterior pairs, excepting the coxae and trochanters, 

 honey-yellow ; posterior pair black, their tarsi yellow. 

 Length at least half an inch. 



2. B. ^QUATUS. — Black; antennae and feet, excepting the 

 hinder thighs yellow. 



Inhabits Indiana. 



Body black : antennas yellow, at tip and base a little dusky : 

 hypostoma with two slight lobes situated longitudinally, and with 

 the mouth and orbits yellow : thorax with a slightly indented line 

 each side before and another over the wings : wings violaceo-fuligi- 

 nous; nervures and stigma blackish, the latter with a whitish dot at 

 its stricture ; second cubital cellule pentangular, the two angles on 

 the costal side rectangular and the three corresponding sides 

 equal, the two anal sides shorter than equal, two sides with a 

 white spot, and the two recurrent nervures with each a white 

 spot : wing-scale and junction of the wings with the thorax honey- 

 yellow : feet, anterior pairs honey-yellow ; posterior pair with the 

 tibiae and tarsi yellow. 



Length about half an inch. 



It has much resemblance io Agathis poUta nob. 



.3. B. FUGiTivus. — Second cubital cellule petiolated ; posterior 

 tibiae annulate. 



Inhabits Indiana. 



Body black : antennae in both sexes black : mandibles and 

 palpi white : wing-scale white : wings hyaline ; nervures black, 

 whitish at base ; second cubital cellule very small, petiolated 

 from the radial cellule: raetathorax [248] not obviously ex- 

 cavated behind, but with somewhat raised lines; abdomen ar- 

 cuated ; towards the tip rather abruptly clavate ; punctures very 

 small : oviduct as long as the tip of the abdomen : feet honey- 

 yellow, with a white reflection ; posterior tibiae white with black 



1835.] 



