Fleas as Pests to Man and Animals, With Suggestions for Their Control. Page: 3
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FLEAS AS PESTS TO MAN AND ANIMALS.
The insect remains within the cocoon for a period which may
range from three days to more than a year. The cocoon of the dog
flea is illustrated in figure 1 at b. The dark curved object within is
the larva just before pupating.
The complete life cycle of members of this group of insects may
be passed in as short a period as 19 days, but during cool weather
FIG. 1.--The dog flea: a, Egg; b, larva in cocoon; c, pupa; d, adult; e, mouth parts of
same from side; f, antenna; g, labium from below. b, c, d, Much enlarged; a, e, f, g,
more enlarged. (From Howard.)
or under adverse conditions the total period from egg to adult may
extend considerably over a year.
HOW LONG THE ADULT WILL LIVE.
The length of life of the mature flea varies much in
species and also under different atmospheric conditions.
FI. 2.-The European rat flea: Larva. Greatly enlarged.
hot, dry weather, and when no animals upon which to feed are
present, the duration of life is exeremtly short-two to five days
When allowed to feed on blood, which is the only food taken by the
adults, they may live from a month to almost a year. During sum-
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Bishopp, F. C. (Fred Corry), 1884-1970. Fleas as Pests to Man and Animals, With Suggestions for Their Control., pamphlet, 1915; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc87634/m1/3/: accessed February 16, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.