208 THE CANADIAN ENTOMOLOGIST. 



which is rather broadly dilated ; ovipositor shorter than the abdomen. 

 Length .55 inch. 



Hab. — Georgia (Ridings). 



Mesostenus exaptus. — °. . Black ; head and thorax marked exactly 

 as in audax ; front unarmed ; mesothorax rather sparsely punctured, the 

 two impressed lines distinct only in front ; metathorax reticulated, broad 

 and flat on posterior face, sub-pubescent ; the tubercles short and obtuse ; 

 antennae robust toward tips ; wings hyaline, slightly dusky at tips, areolet 

 open ; legs fulvous-yellow, anterior coxa? and trochanters whitish, tarsi 

 yellowish ; abdomen fusiform, shining, impunctured, apical margin of the 

 segments narrowly whitish, the first segment, and anterior margin of the 

 yellowish band on second segment, fulvous, post-petiole rather broadly 

 dilated ; ovipositor a little longer than the abdomen. Length .32 inch. 



Hab. — Massachusetts (Ridings). 



Mesostenus Saundersi. — °. . Black, shining; anterior orbits inter- 

 rupted on sides of face, short line on posterior orbits, spot on clypeus, 

 palpi, annulus on antenna;, spot on scutellum, dot behind, the short blunt 

 tubercles on metathorax, tegulae, and dot beneath, all yellowish-white ; 

 mesothorax sparsely punctured, without impressed lines ; metathorax 

 broad, reticulated, flat on posterior face ; sides of pleura longitudinally 

 excavated, polished ; wings hyaline, faintly dusky at tips ; areolet open ; 

 legs fulvous, posterior tibia; dusky at tips, tarsi pale yellowish, fuscous at 

 extreme tips ; abdomen fusiform, shining, impunctured ; the first segment 

 entirely, and broad apical margin of second segment, fulvo-ferruginous, 

 apical margin ot remaining segments narrowly whitish, interrupted on disk 

 of third segment ; post-petiole rather broadly dilated ; ovipositor as long 

 as the abdomen. Length .40 inch. 



Hab. — Canada West (Mr. Wm. Saunders). In this species the head 

 and thorax are almost entirely black. 



Mesostenus laticinctus. — % . Black, opaque ; broad orbits, face, 

 clypeus, mandibles except tips, palpi, broad annulus on antennae, collar, 

 broad line on each side of prothorax above, spot on disk of mesothorax, 

 scutellum, large mark on each side behind posterior wings, spot beneath 

 them, flanks of metathorax, two elongate marks on posterior face covering 

 the prominent transversely compressed obtuse tubercles, tegulae, dot 



