1921] NATURAL SCIENCES OF PHILADELPHIA. 103 



Explanation of Plate IV. 



Male hypopygium of Gonomyia (Leiponeura) acuminata sp. n. 

 Male hj'popygium of Gonomyia (Leiponeura) falcifer sp. n. 

 Male hypopygium of Gonomyia (Leiponeura) spicata sp. n. 

 Male hypopygium of Gonomyia (Leiponeura) bispinosa sp. n. 



Pleural appendages of the same; enlarged. 

 Male hypopygium of Gonomyia (Leiponeura) crepuscula sp. n. 



Penis-guard and gonapophyse of the same. 

 Male hypopygium of Gonomyia (Leiponeura) ctenophora sp. n. 

 Male hypopygium of Gonomyia (Leiponeura) phoroctenia sp. n. 

 Male hypopygium of Erioptera (Erioptera) micromyia Alexander. 

 Male hypopygium of Dicranomyia acuminata sp. n. 

 Male hypopygium of Dicranomyia egae sp. n. 

 Male hypopygium of Dicranomyia napoensis sp. n. 

 Male hypopygium of Dicranomyia rapax sp. n. 

 Ventral pleural appendage; D = Dorsal pleural appendage; PI = Pleurite; 

 Pgd = Penis-guard; Gon = Gonapophyse. 



