MEXICAN HYMENOPTERA. 35 



line, iritlescent. nervures brown ; tips of tarsi and extreme tip of ab- 

 domen dusky. Form long, slender; bead transverse, eyes large, (an- 

 tenniB wanting); thorax gibbous; metatborax rounded, a subbasal, 

 transverse, subarcuate carina, and a small wbitisb tubercle on each 

 side bej'ond tbe middle ; areolet 5-angular, incomplete; legs slender; 

 abdomen petiolated, narrow, cylindrical. Length 22 lines. 

 One S specimen. 



5. Mesoleptus emaceratus, n. sp. 



% . — Head and thorax black ; a reddish spot on clypeus ; antenntc 

 black, with a white annulus about the middle, four basal joints honey- 

 yellow; wings hyaline, iridescent, tips faintly dusky; legs honey-yel- 

 low, a dusky stain on sides of four basal segments, most of fifth and 

 whole of sixth segments black, remainder white. "Smooth and po- 

 lished, pubescent; eyes large; antennae longer than body, very slender, 

 filiform, basal joints of flagellum very long; thorax gibbous; scutel- 

 lum flat ; metathorax coarsely rugose, with a central transverse carina ; 

 areolet 5-angular, subtriangular ; legs long and slender, posterior coxfc 

 long, ovate; abdomen petiolated, long and slender, especially at base, 

 first segment as long as second and third together. Length 4] lines. 



One % specimen. 



6. Mesoleptus decorosus. n. sp. 



S. — Lemon-yellow; tips of mandibles, large spot covering ocelli, 

 spot on each side of occiput extending to eyes, line on prothorax, three 

 broad stripes on mesothorax, base of scutellum and of postscutellum, 

 basal suture of metathorax, a median stripe, anterior suture of pleura, 

 line on each side of posterior coxae, line on all the femora within, sub- 

 obsolete on the two anterior pairs, an exterior line on posterior femora, 

 tips of tarsi, submedian spot on first segment of abdomen, and the re- 

 maining segments, except rather broad apical margins, black ; wings 

 yellowish-hyaline, iridescent, nervures brown, stigma yellow ; antennic 

 brown, darker at tips, testaceous beneath, scape yellow beneath. 

 Smooth and polished; head subbuccate, eyes large; antennae long, 

 slender; scutellum convex, metathorax smooth, rounded, with a me- 

 dian, transverse carina; wings ample, areolet triangular; legs slender; 

 abdomen subpetiolated, subclavate, convex, subpubescent, first segment 

 gradually dilated to apex, a little longer than second. Length 3 lines. 



One % specimen. 



