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PROCEEDINGS OF THE NATIONAL MUSEUM 



Figures 50-55. — Acerentomon americanum Ewing: 50, sterna of abd. VII-XII, specimen 

 from Luray Caverns; 51, comb on abd. VIII, holotype; 52, foremost part of head with 

 "labrum" (Lbr) and mouth parts of holotype; Mdb= mandible; Mx= maxilla; 53, chaeto- 

 taxy of head, holotype, drawn by Bonet; 54, filamento di sostegno, holotype. Acerentomon 

 andrei Ewing: 55, foretarsus, exterior side, holotype. 



