On Certain Grass-Eating Insects. 59 



BB. Specialized representatives of the /z^/^<7/^//«j- division. The 

 valves are less than five times as long as broad. 

 C. Valve nearly triangular ; harpe more or less reduced ; ac- 

 cessory spine slender when present. {Subdivision /.) 

 D. No accessor}^ spine ; general color yellow ; harpe 

 greatly reduced. {The Decorellus Groups) 

 K. Harpe strongly recurved. 



F. Harpe rather long, irregular, PL VI. , Fig. 6. 



decorellus. 

 FF. Harpe short, regular, bifid. PI. VI., Fig. 7. 



teterrellus. 

 EE. Harpe not strongly recurved. 

 F. Harpe short, tip acute. PI. VI., Fig. 8. 



rzcricolellus. 

 FF. Harpe shorter, tip obtuse. PI. VI., Fig. 9. 



vulgivagellus. 

 DD. Accessory spine present. 



E. Uncus and lower limb nearly equal ; color rufous 

 with a broad white discal stripe. ( The Lhiistriatellus 

 Group. ) 



F. Harpe long, strongly recurved at tip. PI. VII., 

 Fig. 10. unistriatellus. 



G. Discal stripe nearcosta at base of wing, stripe 

 extending to outer margin.* PI. XIII., Fig. 12. 



hastiferellus. 

 GG. Stripe near center of discal cell, notextending 

 to outer margin. 

 H. Tip of stripe simple. PL XIII., Fig. 11. 



leachellus. 

 HH. Tip of stripe bifid. PL XIII., Fig. 13. 



praefedellus. 

 EE. Uncus greatly reduced in length. {The Giradellus 

 Group. ) 

 F. Accessory spine at base of valve. PL VIII. , Fig. 14. 



giradellus. 

 FF. Accessory spine near apical third of valve. Pl.X. , 

 Fig. 25. floridus. 



* J ca nnot separate these species on the male geniatalia. 



