106 



Holotype in the collection of the Boston Society of Natural 

 History. 



This is the fourth species of the genus to be described with the 

 remarkable branched bristles on the inner appendages of the 

 hypopygium. Pelastoneurus furcatus Loew has the lamellae 

 forked; Pelastoneurus ramosus Van Duzee has long sickle-shaped 

 lamellae; in Pelastoneurus arbor eus Van Duzee the lamellae are 

 very large, irregularly elongate-oval, while in this form the 

 lamellae are about as long as wide and somewhat obcordate 

 in outline. 



