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822

Synonym.—Uncinaria americana.

History.—In May, 1902, Stiles discovered that ankylostomiasis in America was not, as a rule, due

Male Female. Fig. 181.—Necator americanus. (After Placencia.)

to Ankylostomum duodenale, but to a new species of the closely allied genus Necator, which he named Necator americanus.