254 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Monocrita carinata, wp. iiov. 



(PL XI, Fig. 4, 9.) 



9. Length, 1.20'""'. Black, sliining, subpubescent; head transverse, 

 the face with a central longitudinal carina extending from the front 

 ocellus to betweeu the base of antennie. Antenna^ 10-Jointed, the scape 

 yellow, the flagelluiu brown and twice the length of the scape; jx'dicel 

 long-oval; joint 1 of funicle small, tlie second enlarged; club C-jointed, 

 the joints, except the last transverse-quadrate, the last cone-shaped, 

 slightly more than twice as long as the penultimate. Thorax witli the 

 parapsidal furrows delicately impressed posteriorly, obsolete anteriorly. 

 Scutellum convex, smootli, with a carina surrounding the hind margin. 

 Legs brownish-yellow, the femora and tibi;e very slightly embrowned, 

 the coxie black. Teguhe piceous-black. Wings subhyal'ue, pubescent, 

 the subraarginal vein brown, ending in a large rounded knob and with 

 a distinct basal nervure. Abdomen oval, smooth, shining, the first seg- 

 ment and the second at base, striated. 



Habitat, — District of Columbia. 



Type in Coll. Ashmead. 



Described from a single specimen, captured by Mr. E. A. Schwarz, 

 May 5, 1890. 



ISOSTASIUS Forster. 



(Type I'latygaatvr punctUjer Nees). 

 Hym. Stud., ii, ].. 10r> (1856). 



Head transverse, vertex subconvex, occiput not margined; ocelli 3, 

 in a triangle, rather close together, the lateral distant from tlu? mar- 

 gin of the eye; eyes oval. Anteuuiii inserted just above the clypeus, 

 10 jointed in both sexes, in the 9 the 4 terminal joints forming a 

 large club, the last joint of which is the largest; pedicel cyathiform, 

 much larger than the first funiclar joint; the four funiclar joints are 

 all small, moniliform; in $ with a r)-jointed club. 



Thorax ovoid, the prothorax visible from above, rounded before; 

 mesonotum smooth or punctate, with or without furrows; the scutellum 

 rather high, cushion-shaped or convex, separated at base from the 

 mesonotum by a deep transverse furrow; metathorax very short. 



Front wings with the submarginal vein terminating in a small knob 

 before reaching half the length of the wing. 



Abdomen iu 9 conical-ovate, 0-jointed; in $ oval, 7-jointcd, the 

 basal segment short, broader than long, the second very long and 

 occupying fully two-thirds of the whole surface, the following very 

 short. 



Legs clavate, the tibial spurs 1,1,1, the tarsi 5-jointed, the basal joint 

 of posterior tarsi 2i tinu's as long as the second, or less than thrice as 

 lon§;, 2 to 4 subequal, the last a little longer than the second. 



