THE CANADIAN ENTOMOLOGIST. 



193 



or by sound whether the Bark-louse was already inhabited by a parasitic 

 larva, and it is altogether likely that this extraordinary development of the 

 antennae in these genera is of use in this direction, and was developed in 

 response to some such need, for it will be noticed that this conformation 

 occurs in the female sex only, and that the males of such of these genera 

 as have known males have antennae of the ordinary pedicillate whorled 

 type. 



RlLEYA SPLENDENS. 



"The relationships of this California parasite, although it forms a new 

 and in some respects abnormal genus, are plainly with the European genus 

 Cerapterocerus of YVestwood (Tclegraphus Ratz.j, of which two species 

 have been described, viz., C. mirabilis YVestwood, and C. corniger Walker, 

 of both of which we have authentic specimens in the collection of the 

 National Museum, through the courtesy of Dr. Mayr. of Vienna. The 



