Billbugs
Billbug adults are small grayish or black weevils in the beetle family.
The young, or larval stage, are cream colored and legless. They are the damaging stage of this insect. They live in the soil and thatch and are not visible unless you actively search for them. They feed on the shoots and stems of the grass first, moving down into the crown and roots as they mature.
Adults will often be seen walking along pavement, or walkways, on sunny days in late May or June, with the damage appearing in late July to early August.