Adult fleas are dark brown, strongly flattened from side to side ,with many spines on their legs and bodies. The entire life history of the fleas may be com-pleted in two weeks. How ever,thethe cycle is greatly influanced by tempature and moisture conditions and may require month and even years for completion Periods of hot ,humid weather without extensive precipitation are often very favorable for fleas. The female flea does not lay eggs until she has had a blood meal. Generally,the eggs will be dropped while the female is on the host.
Eggs normally hatch in two days to two weeks.
The larvae are slender,straw-colored and active. They have chewing mouthparts and their food is organic debris,such as lint,dust and flea excretia. Larvae are generally found in the bedding of the host. Flea larvae do not bite pets or humans. Depending on temperature the larvae may feed from one to five weeks.