256 



ZOOLOGY. 



IrMg. 341.— M^tamorphosU of Sarcopsylla penetrans, or jig!?er, which lives hi the toe 

 of the natives of tropical America, 1, egg ; 2, embryo ; 3,lar\'a ; 4, cocoon ; 5, pupa : 

 €, fecundated female ; 7. the same on the third day from its entrance ander the ekin 

 of its human host ; 8. the Fame after several days' residence in the skin of its host ; 

 i), fally grown fi-male magnified fonr time? ; 10, head of the i-ame s-till more enlarged ; 

 11, the femnle before it has entered the ekin of it- host ; 12, the moulh-parta. mnch 

 ■enlarged ; m, mandibles ; d, maxillary palpi ; u, under-lip or labium. —After Kareten 

 and Guyon. 



