She's probably carrying fleas that weigh more than you do.
Fleas are wingless insects, with a laterally compressed body, small and indistinctly separated head, and short thick antennae situated in cavities somewhat behind and above the simple eyes, which are always minute and sometimes absent.
With many writers it is customary to treat the fleas as a suborder of Diptera, under the title Aphaniptera or Siphonaptera.
Since, however, although undoubtedly allied to the Diptera, they must have diverged from the ancestral stem at an early period, before the existing forms of Diptera became so extremely specialized, it seems better to regard the fleas as constituting an independent order (see FLEA).
The wingless forms in question are always allied to winged forms, and there is every reason to believe that they have been really derived from winged forms. There are also insects (fleas, &c.) in which metamorphosis of a " complete " character exists, though the insects never develop wings.
Lamarck at the same time founded the class Crustacea for the lobsters, crabs and water-fleas, also until then included in the order Aptera of Linnaeus.
To the traveller, the most conspicuous among the Mexican insects, perhaps, are the butterflies, beetles, ants and the myriads of mosquitoes, midges, fleas and chinches.
To gamekeepers and those interested in the preservation of game, all animals such as the pole-cat, weasel, stoat, hawks, owls, &c., which destroy the eggs or young of preserved birds, are classed as "vermin," and the same term includes rats, mice, &c. It is also the collective name given to all those disgusting and objectionable insects that infest human beings, houses, &c., when allowed to be in a filthy and unsanitary condition, such as bugs, fleas, lice, &c.
Coming to man, it is known that some albino negroes are peculiarly sensitive to the bites of insects; and with Europeans it is a generally observed fact that the fairer individuals are more seriously affected by the bites of fleas and bugs than are darker ones.
There are many large and poisonous spiders and flies; fleas and mosquitoes abound.
The prescriptions are for a great variety of ailments and afflictionsdiseases of the eye and the stomach, sores and broken bones, to make the hair grow, to keep away snakes, fleas, &c. Purgatives and diuretics are particularly numerous, and the medicines take the form of pillules, draughts, liniments, fumigations, &c. The prescriptions are often fanciful and may thus bear some absurd relation to the disease to be cured, but generally they would be to some extent effective.
The bacillus has been demonstrated in the bodies of fleas, flies, bugs and ants.
In 21 experiments out of 38, 55% of healthy rats living in flea-proof cages have contracted plague after receiving fleas collected from rats either dead or dying of septicaemic plague; consequently it is proved the rat flea can transmit plague from rat to rat.
Fleas caught on plague-infected rats are able to infect rats placed in flea-proof cages.
(I) Plague can be carried by fleas from an unhealthy rat.
Many wingless insects - such as lice, fleas and certain earwigs and cockroaches - are placed in various orders together with winged insects to which they show evident relationships.
Tiberias is notoriously dirty and proverbial for its fleas, whose king is said by the Arabs to hold his court here.
Old Karay had turned his head and was angrily searching for fleas, baring his yellow teeth and snapping at his hind legs.
"Why, fleas, crickets, grasshoppers," answered the buffoon.
He was armed with a musketoon (which he carried rather as a joke), a pike and an ax, which latter he used as a wolf uses its teeth, with equal ease picking fleas out of its fur or crunching thick bones.