154 PROCEEDINGS OF THE ACADEMY OF 



slender; tlie mesothorax is very irregularly sculptured, the 

 posterior middle longitudinally striated ; metatborax reticulated. 

 Length 5f lines. 

 Orizaba. 



6. Mesostejius acceptus, n. sp. 



9. Black; middle of face, clypeus, spot on mandibles, palpi, 

 orbits, annulus on antennae, collar, tegulae, spot in front, short 

 line beneath, round spot on disk of mesothorax, scutellum, spot 

 on postscutellum, two spots on metathorax covering tubercles, 

 spot on flanks, mark behind base of wings, and large mark on 

 each side of pleura, white ; wings lu'aline. dusk}- at apex, nervures 

 black; legs yellow, coxae whitish, anterior and posterior pairs 

 black at base, the latter also at tip, base of trochanters, all the 

 femora beneath, posterior pair at tips and all the tarsal tips, black ; 

 abdomen black above, with all the segments broadly banded at 

 apex with whitish. Robust, opaque ; mesothorax rugulose, pos- 

 terior middle longitudinall}' striated ; metathorax densely rugose, 

 tubercles short, robust and obtuse; legs robust; areolet minute, 

 open ; abdomen broad, robust. Length 4-5 lines. 



Orizaba. 



7. Mesostenus modicus, n. sp. 



9 . Black ; face, mouth, broad orbits, broad annulus on antennae, 

 scape beneath, collar, tegulae, line in front, spot beneath, spot on 

 disk of mesothorax. scutellum, two oblique lines in front, post- 

 scutellum, mark behind base of wings, most of pleura, flanks of 

 metathorax and two broad stripes on posterior face, white ; wings 

 faintly dusky, iridescent, nervures fuscous ; legs j-ellow, coxae 

 whitish, spot on intermediate pair, line on posterior pair and tips 

 of tarsi, black ; abdomen whitish, spot near apex of first segment, 

 a broad mark on middle of second, basal half of third, narrow 

 basal margin of second, fourth and the following segments and 

 narrow apical margin of first segment, black. Slender, somewhat 

 shining; mesothorax feeblj^ punctured; metathorax finely rugose, 

 the tubercles ver}' short and obtuse ; areolet minute, very narrow 

 and open. Length 4 lines. 



Cordova. 



8. Uesostenui communis, n. sp. 



5. Black ; narrow orbits, transverse mark on clypeus, labrum, 

 spot on mandibles, annulus on antcnnce incomplete beneath, line 



