174 L. O. HOWARD. 



Scutellum with a tuft of hair at tip .'Genus Tricliacis Foerster. 



Scutellum without a tuft of hair at tip. 

 Border of abdomen very broadly turned over. 



Genus H.yixtcainpsis Foerster. 

 Border of abdomen not very broadly turned over. 

 Scutellum pillow-shaped, separated from scutum by a deep furrow ; 



seapulge very broad Genus Polygiiotus Foerster. 



Scutellum not separated from scutum by a deep furrcjw ; scapulte not 

 very broad * Genus Platygaster Latreille. 



Subfamily Mymarin^. 



Tarsi 5-jointed. 



Abdomen ])lainly petiolate. 



Antennse 10-jointed with % , 9-jointed with 9 ■ 



Genus Caiiiptotera Foerstei-. 

 Antennte 13-jointed with % , 11-jointed with 9- 



Genus Ooctoiiii!« Haliday. 

 Abdomen sessile or nearly so. 

 il/rt/e. 

 Marginal vein reaches to middle of costa. 



t Genus liiinaci.s Foerster, % . 

 Marginal vein does not reach to middle of costa. 



Antennae 13-jointed Genus GoiiatoceiMis Nees, % . 



Antennfe 10-jointed Genus Alaptiis Walker, % . 



Female. 



Antennte 11-joiuted Genus Oonatoceriisi Nees, 9- 



Antennse with less than 11-joints. 



Anteunte 9-jointed Genus Liitus Haliday. 



Antennfe 8-jointed. 

 Marginal vein reaches to middle of costa. 



t Genus Liiniaeis Foerster, 9 . 

 Marginal vein not reaching to middle of costa. 



Genus Alaptns Walker, 9 • 

 Tar.si 4-jointed. 



Antennal club with two rings. 



Marginal vein very long; the four hind tarsi shorter than their tibia^. 



Genus Eiistocliii$« Haliday. 

 Marginal vein very short; the four hind tarsi longer than their tibi». 



Genus l>oriclyt;tis Foerster. 

 Antennal club not ringed. 

 Abdomen plainly petiolate. 



Fore wings widened only at tip Genus Ulyiiiar Haliday. 



Fore wings not widened solely at tip. 



Marginal vein punctiform ••■ Genus C-OSmocoina Foerster. 



Marginal vein lengthened. 



Metathorax with two carinse ; 9 antennae 9-jointed ( '^ unknown). 



Genus CarapliraotiiK Walker. 

 Metathorax not carinate ; % antenna", 10-jointed, 9 9-joiuted. 



Genus Sttictothrix Foerster. 

 Abdomen sessile, or nearly so. 



