226 EXOTIC NEUROPTERA. 



The genera of Myrmeleonidae known to me to occur in 

 South America may be tabulated as follows ; 



1. In the hind-wings the cubitus is not distinctly forked, the anal 



bending up runs out in a long curve ; palpi very long and 



slender ; antennae well separated at base Diniares. 



In hind-wings cubitus is plainly forked, and anal makes no long 

 curve outward 2. 



2. In hind-wings but one cross-vein before the origin of the radial 



sector 3. 



In hind-wings two or more such cross-veins 9. 



3. In both wings the fork of cubitus is parallel to it, and anal to both 



cubitus and its fork ; first tarsal joint barely longer than the 



second, spurs very short Dimarella. 



Forks of cubitus divaricate, anal not parallel thereto 4. 



4. Many costals of fore-wings crossed ; radial sector arises before cubi- 



tal fork ; spurs but little longer than first joint Pureii. 



Few if any costals crossed, some forked near stigma 5. 



5. Basal joint of tarsus but little longer than the second ; femur I 



rather thick ; spurs about as long as two tarsal joints. 



Psaiiunoleoii. 



Basal joint much longer than second ; femur I slender ; spurs long, 



often one-half the length of the tarsus 6. 



6. In hind-wings the cubitus has many equal branches direct to 



margin 7. 



In hind-wings every other branch of the cubitus is heavier and 

 runs for a distance parallel to the hind margin ; hind-wings 

 longer than fore-wings Glenopsis. 



7. Pronotum longer than broad ; wings quite broad in stigmal region ; 



hind tibia longer than hind femur 8. 



Pronotum broader than long ; wings slender ; hind tibia not longer 

 than hind femur; costal area narrow Incanioleon. 



8. Fore-wings broadest at stigma ; costal area very broad, one or 



both pairs marked ; an oblique vein up from end of anal 



in fore-wings Glenurus. 



Fore-wings broadest before stigma ; costal area very narrow. 



Erenioleon. 



9. No spurs; small, delicate species; anal of fore-wing ends beyond 



middle; wings broadest at stigma Minioleon. 



Spurs present 10. 



10. Two or more series of cells in costal area 11. 



Costals simple, or forked near stigma 13. 



11. Spurs strongly curved; legs thick and hairy; a line in apex of 



wing; antennae well separated Acantbaclisis. 



Spurs but little curved; legs moderately slender 12. 



