lf>8 PROCEEDINGS OF THE ACADEMY OF 



legs pale hone3--3'ellow, spot on posterior coxae above, their tro- 

 chanters, base and extreme apex of their femora, their tibiae en- 

 tirely, four anterior tarsi, base and apex of posterior pair, black. 

 Slender; mesothorax closely punctured; metathorax reticulated, 

 tubercles small, robust, blunt ; areolet small, 5-angular, open ; legs 

 and abdomen long, slender. Length 4 lines. 

 Orizaba. 



15. Mesostenua moratus, n. sp. 



9. Black; face, mouth, broad orbits, broad annulus on an- 

 tennte, collar, tegular, triangular mark in front and spot beneatli, 

 two abbreviated lines on mesothorax, scutellum, two oblique lines 

 in front, spot on postscutellum, oblique spot beneath posterior 

 wings, a larger one behind, two elongate marks on metathorax 

 behind covering spines, a large oblique mark on each flank, coxib 

 except a short black line on posterior pair, first abdominal seg- 

 ment except subapical spot, basal corners of second segment and 

 broad apical margin of second and following segments, white or 

 whitish ; wings hyaline, nerviires Itrown ; legs pale honey-yellow, 

 tarsi paler, their tips black. Robust, opaque, mesothorax finely 

 shagreened ; metatiiorax longitudinally rugose, tubercles promi- 

 nent, blunt ; areolet 5-angular, open ; basal segment of abdomen 

 broadly dilated at tip. Length 4 lines. 



%. Ver}' slender; metathorax yellowish-white, a broad band 

 at base continued posteriorly in a slender line for a short distance 

 on each side, and a short stripe on apical middle, black ; two 

 lines on each of the four posterior trochanters and extreme base 

 and apex of posterior tarsi (the remainder of which is white) also 

 black ; metathoracic spines short and acute. Length 4 lines. 

 Orizaba; Cordova. (Sumichrast, No. 76.) 



16. Mesostenus absolutus, n. sp. 



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

 collar, teguhe, line in front, two short discal lines on mesothorax, 

 scutellum, two oblique lines in front, postscutellum, and pleura, 

 white or yellowish-white; metathorax 3-ellowish-wliite, with a 

 broad black band at base, inclosing a round whitish spot on each 

 side, from which band three black stripes proceed to the apex; 

 wings hyaline, nervures fuscous; legs honey-3'cllow, coxae whitisli, 

 the posterior pair with a slender black stripe, four anterior tarsi 

 fuscous, posterior pair whitish with base yellow and apex black ; 



