The largest component of the female mosquito's mouthparts is the , which surrounds all the other mouthparts and protects them during flight. When the mosquito feeds, this mouthpart stays outside of the body.

Labium

Explanation:

The largest component of the female mosquito's mouthparts is the LABIUM, which surrounds all the other mouthparts and protects them during flight. When the mosquito feeds, this mouthpart stays outside of the body.

Female mosquitoes have mouth types that are used for piercing and sucking.

Both mouth-parts are oddly shaped in female mosquitoes. The labrum is the principal feeding tube from which blood is drained, the labium stays outside the skin of the food item as it is piercing, folding away from the pattern.

The labium of a female mosquitoe encloses all other mouthparts like a sheath. 

The largest component of the female mosquito's mouth part is the labrum.

Explanation:

The mouthparts of a female mosquito consists of six piercing slender stylets that are appressed in a fascicle which is surrounded by the labium. Among the six piercing stylets, the labrum, which serves as the food canal is the largest and stiffest. This labrum has a feather-like opaque cuticle which prevent the observation of blood flow through the food canal.

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