356 ZOOLOGY. 
8 
Fig, 341,—Metamorphosis of Sarcopsylla penetrans, or jigger, which lives in the toe 
? the natives of tropical America, 1, egg; 2, embryo; 3, larva; 4, cocoon; 5, pupa; 
6, fecundated female ; 7, the same on the third day from its entrance under the skin 
of its human host ; 8, the same after several days’ residence in the skin of its host ; 
9, fully pom female magnified’ four times ; 10, head of the same still more enlarged 3 
11, the female before it has entered the skin of its host ; 12, the mouth-parts, much 
pa ; m, mandibles ; d, maxillary palpi ; uw, under-lip or labium,—After Karsten 
and Guyon. 
