162 E. T. CRESSON. 



Mesostentis introitus, n. sp. 



%. — Slender, black; face, anterior orbits, suddenly dilated on each side of 

 lower ocellus, broad posterior orbits, clypeus, labrum, mandibles excejjt tips, 

 and palpi white; antennae long, slender, black, with rather narrow white an- 

 nulus, indistinct beneath; collar, spot on disk of mesothorax, tegulse, spot be- 

 fore, short line beneath, spot before each intermediate coxae, scutellum, a line 

 on each side anteriorly, postscutellum, large spot behind posterior wing, and a 

 large spot on metathorax above, occupying the apical three-fouths, white or 

 yellowish-white; wings hyaline, dusky at apex, areolet minute, quadrate; legs 

 long, slender, honey-yellow ; four anterior coxse, anterior trochanters and spot 

 on posterior coxse behind, pale yellow; posterior trochanters above, apices of 

 their tibiae, and their tarsi, except second and third joints (which are white), 

 black; tips of four anterior tarsi dusky; abdomen long, narrow, with basal 

 half of first segment and a rather narrow continuous band at apex of all the 

 segments except the last, yellowish-white, terminal segment with a whitish 

 spot. Length .40 inch. 



Oae specimen. (Coll. Gr. W. Belfrage.) 



jflesostenas discoidalis, n. sp. 



9. — Black, shining; eyes large and prominent; orbits, broad on cheeks, 

 face, spot on mandibles, and palpi, white; clypeus convex, tinged with honey- 

 yellow; antennae as long as body, slender, black; scape beneath and a very 

 broad annulus on flagellum, white; collar, upper margin of prothorax, discal 

 spot on mesothorax, scutellum, band behind postscutellum, tegulae, dot be- 

 neath, pleura except broad anterior margin, flanks of metathorax and a large 

 mark above, enclosing at apex a black spot, whitish ; metathorax with a trans- 

 verse carina before middle, posterior face transversely wrinkled ; wings hya- 

 line, areolet very minute, quadrate; legs long and slender, pale honey-yellow, 

 four anterior coxse and anterior pair of trochanters whitish, with an exterior 

 dusky stripe; posterior coxae with an exterior black stripe; extreme apex of 

 posterior tibiae, including spurs, and basal fourth of first joint, black ; re- 

 mainder of posterior tarsi pure white; abdomen slender, j)oIished, first segment 

 white with a median black band, remaining segments black with a continuous 

 apical white band; ovipositor half the length of abdomen. Length .38 inch. 

 One specimen. (Coll. G. VV. Belfrage.) 



mesosteiiiis paliidatus, n. sp. 



"^ . — Head and thorax black; all beneath antennae, anterior orbits, space 

 beneath eyes, mandibles except tips, palpi and scape beneath, yellowish-white ; 

 head narrow, scarcely wider than thorax, face broad, clypeus with no distinct 

 basal suture, mandibles broad; antennae nearly as long as body, slender, black 

 above, the scape short and subglobose, flagellum pale fulvous beneath ; meso- 

 thorax deeply punctured, with the longitudinal lines deeply impressed; col- 

 lar, upper lateral margin of prothorax, discal spot on mesothorax, scutellum, 

 tegulae, line beneath anil pleura beneath, white; metathorax very uneven, ob- 

 liquely truncate behind, with prominent lateral angles, ferruginous laterally, 

 black at base and centrally, whitish down each lateral carina, a smooth, shi- 

 ning, quadrate central area, before which is a sharply defined transverse 

 carina; wings hyaline, iridescent, areolet minute, quadrate; legs honey-yel- 

 low; four anterior coxae, anterior trochanters and joints 2 — 4 of posterior tarsi, 



