40 



THE BRITISH WOODLICE, 



terminal part, or fiagellum, and a basal part, the peduncle (fig. 3). 

 The number of joints in these structures, which varies in different 

 genera and species, forms a useful -classificatory character, and 







Proximal 

 c/ouid 



FLAGELLUM 



PEDUNCLE 



FIG. 3,— THE SECOND ANTENNA. 



(Oniscus asellus.) 







the relative length of the component parts is of considerable 

 value in distinguishing species. 



There are four pairs of mouth appendages — namely the jaws 



Upper Up 



Mandible... 



Moutk,'- 



•dBase of 



.Zaleral 

 "'■••lobe 



ez/e 



(compound) 



Maxiliipeds 



FIG. 4.-THK UNDERSIDE OF THE HEAD. 



(Oniscus asellus.) 



or mandibles (fig. 5), the first maxillae (fig. 6), the second maxillae 

 (fig. 7), and the maxillipeds (fig. 8). When the head is examined 

 from the underside the last of these organs will be seen first, 

 covering in the others. 





