710 BOSTON JOURNAL 



TOXONEURON. 



15. B. VIATOR. — Sanguineous ; antennae, vertex, wings and 

 pectus black. 



Inhabits Indiana. 



Body ratlier pale sanguineous : antennae, vertex and dilated 

 frontal spot, part of the hypostoma and mouth, black : thorax 

 with indented lines ; a black spot on the middle sometimes obso- 

 lete or wanting : metathorax behind black : wings blackish-fuli- 

 ginous ; nervures robust, black ; stigma and costal nervure honey- 

 yellow : pleura, pectus and coxa) black ; the former sanguineous 

 near the wings : tarsi at tip blackish : abdomen depressed. 



Length one-fourth of an inch. 



This species and the following differ from the type of the 

 genus Bracon in the from of the radial and third cubital cellules, 

 in consequence of the arcuation of the separating nervure. 



It is much Vike jwinilatoi- nob., but among other characters it 

 may be distinguished by the yellowish carpal spot and costal 

 nervure, which are always black in the populator. 



15. B. POPULATOR nob. Long's Exp. to St. Peters, Appendix, 

 p. 323, belongs to this subdivision. [259] 



17. B. TiBiATOR nob. ibid. p. 322, also of this subdivision. 



18. B. EXPLORATOR. — Black; feet partly rufous. 

 Inhabits Indiana. 



Body black, polished ; with small, prostrate hairs : thorax 

 with the impressed lines not remarkably dilated ; the transverse 

 one punctured : wings dusky, stigma rather large : feet black ; 

 thighs rufous, excepting a small portion at base, posterior pair 

 entirely rufous ; tibise rufous, black at tip. 



Length three-twentieths of an inch. 



The thorax and head are much less hairy than those of tihiator 

 nob., and that insect has the wings dusky at tip only ; the pre- 

 sent also is a smaller species. 



fit t Second cubital cellule confluent with the third. 



Aliolus. 



Ahdomrn of three princq^al segments. 



19. B. TRILOBATUS. — Yellowish-rufous ; thorax and vertex 

 black. 



Inhabits Indiana. 



[Vol. I. 



