354 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



moniliforin, tho last very largi', fusifonn, as loiiji as the two pieeediug 

 joints together; in S 14 joiiitetl, filiform, the tirst Hagellar joint not, or 

 scarcely, eniarginate at base. 



Maxillary piilpi, 4-jointe(l; labial palpi, S-Jointed. 



INIandibles short, acnte, with a small tooth within. 



Thorax subov()i<l, the jnothorax visibh' above as a transverse ridge, 

 produeed anteriorly into a slight neck, angles straight: mesonotum 

 trapezoidal with 2 deep furrows; seutellum convex with a deep fovea 

 at base; nietathorax carinated, with the i)osterior angles acute. 



Front wings pubescent with a basal and a closetl marginal cell; the 

 marginal vein not as long as the marginal cell ; the first branch of radius 

 straight or but slightly obli«pie; hind wings with a single cell. 



Abdomen conic-ovate, the petiole a little longer than thick, Huted; 

 in 9 7-jointed, the second segment very large, third to sixth very short, 

 the last acute, conical, longer than segments 3 to <> united. 



Legs clavate, jiubescent; the middle and hind tibial spurs short and 

 weak ; the tarsi long, slender, the basal joint more than twice the length 

 of the second. 



Acropiesta flavicauda, sp. nov. 



(PI. XIV, Fij;. 3, 9.) 



$. Length, 3""'. Black, shining, the last abdominal segment yel- 

 low. Antenna' la-jointed, extending to apex of metathorax, incras- 

 sated toward tips, rufous, the last joint large, oblong, dark fuseous; 

 first Hagellar joint twice as long as the second, the joints beyond 

 moniliforni. Thorax with two furrows, the seutellum with a large 

 deep fovea. Metathorax carinated, the sides covered with a fuscous 

 pubescence. Tegula' yellowish. Wings subhyaline, the venation 

 fuscous, the marginal vein two-thirds the length of the closed marginal 

 cell, the first branch of the radius slightly obli<pie. Legs rufous. 

 Abdomen conic-ovate, black, polished, the petiole not longer than tlie 

 metathiu-ax, fluted; the third, fourth, fifth, and sixth segments very 

 short, the last longer than these united, conical and yellow. 



Habitat. — Ottawa, Canada. 



Type in CoW. Ashmead, 



Described from a single specimen received from Mv. ^X. Hague 

 Harrington. 



Acropiesta subaptera, sp. iiov. 



$. Length, 2,2""". Head gh>bose, black; tluu'ax and abdomen 

 brownish pieeous; scape, pedicel, and legs brownish yellow. The 

 whole bo*ly is polished, impuuctured. and pubescent; the frontal 

 promiuen(;e large; antenine 15-jointed, moniliforni, the first flagellar 

 joint twice as long as the second, cylindric, joints 2 to 5 round, from 

 here to the last transverse-raoniliform. Thorax with two almost par- 

 allel furrows, very slightly converging toward each other posteriorly; 

 seutellum convex, with a deep quadrate fovea at base; mesopleura 



