SIPHONAPTERA. 143 
The dog and cat are among the species that are specially subject to 
its attack, but other mammalia are affected, and Railliet mentions 
sheep, goats, cattle, horses, asses, and mules, and even birds as hosts, 
and cites particularly a case where a hog was very seriously infested. 
The foot examined by R. Blanchard had been obtained from Liberia 
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FiG.77.— Sarcopsylla penetrans: 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 grown female—magnified four times; 10, head 
of same still more enlarged; 11, female before entering skin; 12, mouth parts much enlarged; 
m mandibles, d, maxillary palpi, uv, labium (after Karsten and Guyon.) 
by J. Jullien, and after the extirpation of the fleas presented the 
appearance of the cells of honeycomb, so thickly had the parasites 
been crowded together. 
The adult fleas affect their hosts as in other species, but the females 
after impregnation burrow into the skin of the host, especially under 
a 
