202 PROCEEDINGS OF THE ACADEMY OF [May-Oct., 



are of course of identical derivation; so are Louis and Louise, Francis 

 and Frances, which serve very well. Until there is a definite ruling 

 by the International Commission, it may be as well to continue 

 to use the familiar Pacliychilus. 



Those who consider -us and -a names identical can adopt Cerci- 

 melania, type liehmanni Phil., proposed as a subgenus of Pachy- 

 chilus. 



