150 FAMILY EVANIID.E. 



tion. For this reasou I have beeu frequently obliged to omit state- 

 ment of the sex in the descriptions that follow. Judging from the 

 other genera it may be inferred that those with more filiform an- 

 tennae and shorter scape are males. Some of the published descrip- 

 tions have certainly erroneously stated the sex. 



The largest species that I know is about the size of Evania 

 appe7idigaster, the smallest measures 2.5 mm. Hyptia is the most 

 specialized genus of Evaniinse, except Evaniellus, as is evident pri- 

 marily from- the wings, where the climax of atrophy is reached, 

 almost all the veins having disappeared. The mouth-parts and 

 thoracic structures show further specialization along the lines fol- 

 lowed hy Evania, a.wd I think it not improbable that even the short- 

 ness of the hind legs indicates greater specialization, although in the 

 opposite direction, than tiie extreme length of the same in the other 

 genera. Further I believe the genus to be one that is undergoing 

 active modification today, judging from the fact than in our North 

 American species, which I have studied very carefully, it is difficult 

 to find any two specimens which do not differ more or less in one or 

 more characters, although perhaps to an extent that would not be 

 noticeable to one not very familiar with the group. 



Hyptia. is confined to the Americas, and reaches its highest devel- 

 opment in the tropics, where future collection may be expected to 

 yield a very large number of new species. 



TABLE TO THE XORTH AMERICAN SPECIES OF HYPTIA. 



1. Flaoellum distinctly thickened beyond the middle, tapering again toward the 



apex, giving the antennae a distinctly clavate appearance, the joints in 



the thickened portion often scarcely longer than broad (Fig. 58). .(2). 



Flagellum filiform or slightly and evenly thickened, the joints distinctly 



longer than broad (Fig. 57) (4). 



2. Petiole more or less distinctly punctured, slightly or not at all striate • • • -(3). 

 Petiole finely and very distinctly sublongitudinally striate. 



harpyoides n. sp. ( 9 )• 



3. Sides of the propodeum sculptured as in Fig. 8; species black. 



mylacridoinaues n. sp. 



Sides of the propodeum sculptured as in Fig. 6; species usually more or less 



red tliorac'ica Blanchard ( 9 )• 



4. Scai)e one-quarter or less longer than segments 3 + 4 (5). 



Scape distinctly more than one-half longer than segments 3 + 4; petiole 



thickly set all over with coarse punctures, between which are inter- 

 rupted striiE ret iciilala Say ( 9 )• 



5. Punctui'es evenly placed on the verte.\ and mesonotum, about their diameter's 



length apart. Length 2.8 mm floridiiiia Ashniead. 



Punctures much rougher, more closely placed. Length U mm. or more •• -(6). 



