Img 1 After the larval-pupal molt, flea pupae are initially white.
Flea pupae are initially white. As they age, they’ll turn yellow, and then finally brown. These color changes are rarely seen, as most fleas pupate within camouflaged cocoons.
Flea Pupae Color
Flea pupae, after the larval-pupal molt, are initially white for 5 to 9 days. They then transition into yellowish color for 2 to 3 days. Finally, the pupae darken into a brown color. Their bristles and combs turn black 1 to 2 days into the brown stage. All these color changes occur on the underlying adult cuticle. The pupal cuticle remains colorless. Pre-emerged fleas within their pupal casing are nearly as dark as adult fleas.
Img 2 Mature flea pupae are a brown color, nearly as dark as adult fleas.
Flea Cocoon Color
Most fleas pupate within cocoons. The cocoons consist of a white, silk-like substance. The soft, moist fibers loosely surround the flea. Debris readily adheres to the sticky cocoons, such as dust, sand, soil, and carpet fibers. As a result, the cocoons blend into their surrounding, almost perfectly camouflaged.
Img 3: Flea cocoons camouflaged with debris from the environment.