230 MEMOIRS OP THE CARNEGIE MUSEUM 



Pronotum large, quadrate or transverse quadrate, never very short, if somewhat shortened always as 

 wide as the mesonotum. 



Pronotum quadrate or subquadrate ; abdomen in ? not triangulated, either globose, ovate, conic- 

 ovate or lanceolate and compressed or subcompressed, the hypopygium most frequently 

 prominent plowshare-shaped ; second dorsal segment never very large ; mandibles not strong, 

 most frequently 4-dentate Family LXIII. Exjrytomid^. 



Pronotum shorter, more transverse and as wide as the mesonotum ; abdomen in 9 most frequently 

 triangulated, or globose, the second and third segments occupying most of the dorsal surface, 

 the following very short and more or less retracted within the third ; hypopygium not 

 prominent ; mandibles 2- or 3-dentate at apex Family LXIV. Pbeilampid^. 



6. Second abdominal segment very large and most frequently enclosing the following ; coxae not large, 



subglobose, nearly equal ; all legs very slender ; radius scarcely developed, its stigma sessile or sub- 

 sessile Family LXV. EucHARiD^. 



7. Mesepisternum not large, triangular ; anterior femora never much swollen, the posterior femora also 



normal or only slightly swollen ; marginal vein in hind wings usually long, the costal cell not reach- 

 ing to the booklets or spinulse and most frequently very narrow ; radius well developed. 



Family LXVI. Miscogasterid^. 



Mesepisternum large, triangular ; either the anterior or the posterior femora are much swollen and 



sometimes toothed, or both are swollen with the hind femora toothed ; if with slender legs, the hind 



legs are very long, their coxse long, cylindrical, while the radius (stigmal vein) in front wings is 



very short, with the postmarginal vein very long extending to the apex of the wing {Pelecinella). 



Family LXVII. CLEONYMiDiE. 



8. Mesonotum either depressed, with more or less distinct parapsidal furrows, the scapulae longitudinally 



ridged, or convex or subconvex, entirely without furrows, rarely convex with distinct furrows ; 

 axillae most frequently meeting at inner basal angles, rarely very widely separated. 



Family LXVIII. Encyrtid^. 



9. Mesonotum subconvex with incomplete or complete parapsidal furrows ; hind coxse rarely much larger 



than the front coxae ; axillae separated, not meeting at inner basal angles ; mesepisternum usually 

 small, wedge-shaped or triangular ; hind wings with a long marginal vein ; mandibles usually stout, 

 3- or 4-dentate at apex. Family LXIX. PteromalidjE. 



10. Hind coxae normal ; mesopleura impressed 11 



Hind coxae abnormally large and dilated, their femora flat or compressed ; tarsi very long ; mesopleura 



entire, not impressed ; marginal vein in front wings most frequently extraordinarily lengthened, the 

 radius very short, scarcely dilated ; mesonotum without furrows Family LXX. Elasmid^e. 



11. Tarsi 4-5-jointed, rarely heteromerous ; anterior wings not short and broad, with the pubescence 



normal , marginal and radial veins normal ; postmarginal vein often wanting ; mesonotum with 



complete or incomplete furrows Family LXXI. EuLOPHiDiE. 



Tarsi 3-jointed ; anterior wings short and broad, broadly rounded at apex with the pubescences most 

 frequently arranged in rows, more rarely normally pubescent ; marginal and radial veins united in 

 the form of a strongly curved line fl Family LXXH. TRiCHOGRAMMiDiE. 



12. Pronotum usually large, rounded, or conically produced anteriorly; wings always with a long 



marginal fringe, nearly veinless and always without a radius (stigmal vein), the marginal vein most 

 frequently reduced to a mere dot ; antennae in 9 most frequently terminating in a distinct fusiform 

 or egg-shaped solid club, more rarely with a 2-jointed club ; tarsi 4-5-jointed. 



Family LXXIII. Mymarid^. 



