254 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Monocrita cariiiata, .sp. nov. 

 (I'l. XI, Fig. i, 9 .) 



9. Length, 1.20'""'. Black, shilling, snbi)ubescent; head transverse, 

 the face with a central longitudinal caiina extending from the front 

 ocellus to between the base of antenn;e. Anteiiiiie lOjointed, the scape 

 yellow, the Hagelluin brown and twice tlie length of the .scai)e; pedicel 

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

 the joints, except the last transverse-quadrate, the last C()ne-shaped, 

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

 parapsidal furrows delicately impressed posteriorly, obsolete anteriorly. 

 iScutellum convex, smooth, with a carina surrounding the hind margin. 

 Legs brownish-yellow, the feinr)ra and tibiie very slightly embrowned, 

 the eoxie black. Teguhe piceous black. Wings subhyaluie, 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, cai)tured by Mr. E. A. Schwarz, 

 May o, 1890. 



ISOSTASIUS F.lrster. 



(Type Phttygaxter iiunct'nier Nees), 



Hyiii. Stud., II, p. 1(X) (185«). 



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

 in a triangle, rather close together, the lateral distai.t from the mar- 

 gin of the eye; eyes oval. Antenna' inserted Just above the clyi)eus, 

 lOJointed in both sexes, in the 5 the 4 terminal joints forming a 

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

 nnich larger than the first funiclar joint; the four funidar joints are 

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



Thorax ovoid, the pnjthorax visible from above, nmnded befcne; 

 mesouotum smooth or puictate, with or with(mt furrows; the scntellnm 

 rather high, cusliionshape<l or convex, separated at base from the 

 mesonotum by a deep transverse furrow; metathorax very short. 



Fr(mt wings with the submarginai vsiu terminating in a small knob 

 before reaching half the length of the w'ng. 



Abdomen in 9 conical-ovate, O-jointed; in <J oval, 7-jointed, the 

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

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

 short. 



Legs clavate, the tibial spurs 1, 1, 1, the tarsi r»-joiuted, the basal joint 

 of posterior tarsi 2A times as long as the second, or less than thrice as 

 long, 2 to 4 subequal, the last a little longer than the second. 



