Fleas are oviparous, and undergo a very complete metamorphosis.
There are many large and poisonous spiders and flies; fleas and mosquitoes abound.
(I) Plague can be carried by fleas from an unhealthy rat.
We may remark that fleas possess no wings, but are understood to possess a true pupa.
It has been previously remarked that the phenomena of holometabolism are connected with the development of wings inside the body (except in the case of the fleas, where there are no wings in the perfect insect).
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.
Should fleas be present an epizootic at once starts and spreads in porportion to the number of fleas present.
Aristotle explicitly taught abiogenesis, and laid it down as an observed fact that some animals spring from putrid matter, that plant lice arise from the dew which falls on plants, that fleas are developed from putrid matter, and so forth.
At least four species of fleas (including Pulex irritans) which infest the common rat are known to bite man, and are believed to be the active agents in the transmission of plague from rats to human beings.
With many writers it is customary to treat the fleas as a suborder of Diptera, under the title Aphaniptera or Siphonaptera.
Willughby, Ray and others in the late 17th century to include the active larvae of beetles, as well as bugs, lice, fleas and other insects with undeveloped 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 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.
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.
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.
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.
Close and continuous contact of plague-infected animals with healthy ones does not infect the latter if fleas are excluded.
Guinea-pigs placed in plague-infected houses do not contract plague if they are protected from fleas; those placed in cages protected by a border of sticky paper at least six inches in radius, which the fleas cannot jump over, do not contract plague; the others not similarly protected, do.
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.