CEDEMERID^S OF BOREAL AMERICA. 4II 



termediate forms occur. In our own species I have ob- 

 served that the claws vary in the different tarsi in the form 

 of the tooth, and even in the same tarsus the claws are 

 not identical. It is, however, quite sure that the use of 

 Probosca for those with toothed claws is entirely inappli- 

 cable, as that genus has not only a prolonged head, but 

 also simple claws. 



On the other hand it seems unwise to retain in the same 

 genus, species in which both mandibles are acute at tip, 

 and those in which the right mandible is practically bifid. 

 Four species possessing the latter character are now 

 known to me, and will be separated. 



In Oxacis Mr. Champion (loc. cit., p. 151) admits a 

 species in which "the joints preceding the penultimate 

 one" of the tarsi are " tomentose beneath." If this must 

 be admitted, the classification of the genera of the family 

 becomes one of some difficulty. 



Three of the species formerly included in this genus 

 have been removed to Copidita, as the mandibles are bifid. 

 The species at present known may be separated in the 

 following 1 manner: — 



Claws simple. 2. 



Claws acutely toothed. 12. 



2. — Last joint of maxillary palpi subcultriform, widest near the 



base, apical side longer than the inner. 3. 



Last joint of maxillary palpi triangular, widest at or beyond 

 the middle. 9. 



3. — Thorax very distinctly punctate. 4. 



Thorax shining, scarcely at all punctate, devoid of pubescence. 



Icevicollis. 

 4. — Terminal joint of maxillaiw palpus subacute. 5. 



Terminal joint rounded at tip; color entirely yellowish testa- 

 ceous, fragilis. 

 5. — Thorax with disc somewhat concave; color pale piceous or 



brownish. g rami lata. 



Thorax convex. 6. 



6. — Elytra subcostulate, indicated by lines of denser pubescence. 7. 



Elytra not subcostulate. 8. 



