REHN AND HEBARD IGl 



{Xiphidium gossypii Scudder, synonym of Conocephalus brevi- 

 pennis (Scudder).) 



Conocephalus resacensis new species 



Conocephalus nemoralis (Scudder) 



Conocephalus occidentalis (Morse) 



{Xiphidium occidentale var. camurum. Moi'se, synonym of 

 Conocephalus occidentalis (Morse).) 



(Xiphidium occidentale var. caudatum iNIorse, synonym of 

 Conocephalus occidentalis (Morse).) 



Conocephalus strictus (Scudder) 



Conocephalus hygrophilus new species 



Conocephalus stictomerus new species 



Conocephalus aigialus new species 



Conocephalus nigropleurum (Bruner) 



Conocephalus attenuatus (Scudder) 



Conocephalus nigropleuroides (H. Fox) 



Conocephalus spartinae (H. Fox) 



Conocephalus saltans (Scudder) 



{Xiphidium modestum Bruner, synonym of Conocephalus sal- 

 tans (Scudder).) 



Key to Males of the North American Species of the Genus 

 Conocephalus found north of Mexico 



A. Prosfernum bispinose. Caudal tibiae armed at distal extremity with 

 three pairs of spurs. 



B. Subgenital plate very strongly produced meso-distad in two sharp 

 straight spikes which are weakly divergent, styles absent, distal margin 

 of plate between productions obtuse-angulate emarginate. 



(Subgenus Dicellura) 

 (Size medium, form robust, ^\'rtox very weakly ascending, sides moder- 

 ately divergent, greatest width two-thirds that of proximal antennal joint. 

 Eyes normal. Convex callosity of lateral lobes very broad. Tegmina 

 broad at apex, tympanum of same unusually large. Dorsvun of abdomen, 

 including cerei, dark brown. Cerci heavy, with mcsal portion not contrast- 

 ingly swollen, armed with a heavy mesal (vertical) tooth which is flat and 

 broad at the base, situated interno-mesad. Ventral margins of caudal 

 femora unarmed.) allardi (Caudell) 



BB. Subgenital i)late not produced distad, disto-lateral styk>s small and 

 filiform, distal margin of plate nearlj' or quite transverse. 



(Subgenus Xiphidion) 

 C. Cerci armed with a heavy mesal (vertical) tooth, so that its base is 

 visible from above, this tooth situated interno-mesad. 



TR.\NS. .\M. ENT. SOC, XLI. 



