ISOPODS OF NOKTH AMEKICA. 



333 



"It is closely allied to Arcturus anna and to Arcturus cornutus, 

 but differs sufficiently from both to constitute the type of a new 

 species. 



. FIG. 364. AKCTUKUS PURPUKEUS (AFTER BEDDARD). DORSAL VIEW. 



"The extreme length of the specimen, which is a female, is 18 mm., 

 the length of the antennae 31 mm. 



