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EXPLANATION OF PLATE 31. 



Petrobius sp. Dorsal aspect of Hypopharynx and Maxillulse. 

 From a preparation stained with acid fuchsin. 



a. Indication of articulation, h. Hypopharynx. I. Inner lobe of maxillula. h. Comb-like 

 projection from surface of maxillula. m. Left maxillula. p. Palp. p.e. Peduncles 

 of hypopharynx. r. Chitinous rods in pentral pharyngeal wall. 



