THE CANADIAN ENTOMOLOGIST. 207 



slightly dusky at tips, areolet open ; legs pale fulvous, tarsi paler, apex of 

 posterior coxa? above black ; abdomen fusiform, shining, impunctured, 

 first segment gradually dilated at tip ; ovipositor as long as the abdomen. 

 Length .45 inch. 



Hab. — New York (Comstock). This may prove to be the % of 

 candidus. 



M esostenus diligens.— ^ . Black ; orbits, very broad on cheeks 

 beneath, face except medial spot, clypeus, base of mandibles, palpi, broad 

 annulus on antennae, collar, large spot on each side of prothorax above, 

 two lines on mesothorax, scutellum, short oblique line on each side 

 anteriorly, spot on post-scutellum, tegulae, spot beneath, large spot behind 

 each posterior wing, small one beneath, large oblique line on sides of 

 pleura confluent with mark in front of intermediate coxae, flanks of meta- 

 thorax, two large sub-cuneiform marks on posterior face covering the short 

 blunt tubercles, four anterior coxae, first abdominal segment except black 

 spot above near tip, spot on each basal corner of second segment, and 

 broad apical margin of segments 2-6, all white ; front unarmed ; meso- 

 thorax with indistinct impressed lines ; wings hyaline, areolet open ; legs 

 pale fulvous, tarsi paler, extreme tips dusky, posterior coxae with white 

 spot above ; abdomen fusiform, impunctured, first segment rather broadly 

 dilated at tip ; ovipositor shorter than abdomen. Length .32 inch. 



Hab. — Illinois (Lewis). 



Mesostenus audax. — $. Black ; orbits, broad on cheeks beneath, 

 sides and middle of face, most of clypeus, spot on mandibles, palpi, broad 

 annulus on antennae, line on collar, spot on each side of prothorax above, 

 two short lines on disk of mesothorax, scutellum, spot on post-scutellum, 

 tegulae, spot beneath, oblique line on sides of pleura, smaller one imme- 

 diately beneath, spot behind posterior wing, round spot on flanks of meta- 

 thorax and two spots on posterior face covering the short blunt tubercles, 

 all white or yellowish-white ; front unarmed ; mesothorax confluently 

 punctured, with indistinct impressed lines ; metathorax rather coarsely 

 reticulated ; wings hyaline, faintly yellowish, areolet open ; legs fulvous- 

 yellow ; coxae dull whitish, posterior pair tinged with fulvous, tarsi pale 

 yellow, extreme tips dusky ; abdomen fusiform, impunctured, first segment 

 and apical and lateral margins of remaining segments, dull whitish, some- 

 times more or less tinged with fulvous, especially the disk of post-petiole, 



