Annual bluegrass weevil

This pest has a complete life cycle (eggs, larvae, pupae and adults) with the larvae being typical for weevils, a C-shaped legless grub.
Eggs:
The eggs are oblong, about 3/64 inch (1 mm) long and change from yellow to smokey black when about to hatch.
Larvae:
The larvae are crescent-shaped, legless and have a creamy-white body. The head capsule is light brown in young larvae but becomes darker in older larvae. Newly hatched larvae are about 3/64 inch (1 mm) long and grow to about 3/16 inch (4.5 mm) when mature.
Pupae:
Pupae are 1/8 to 3/16 inch (3.5 to 4.5 mm) long and are located in cells constructed within the soil. The snout, wing covers and legs are evident on the surface of the pupa. They are first a creamy white, turning reddish brown just before the adult emerges.
Adults:
Adults are 1/8 to 3/16 inch (3.5 to 4.0 mm) long and have the combined length of the snout and prothorax distinctly shorter than the length of the wing covers. This is different than billbugs which have combined snout and prothoracic lengths equal to the wing cover length. This Listronotus is black with the wing covers coated with fine yellowish hairs, yellowish scales and scattered spots of grayish-white scales. Newly emerged adults (callow adults) are orange-brown in color and require several days before becoming fully pigmented.