mirid bug

NOUN
9 LETTERS · STARTS WITH M

mirid bug is a valid 9-letter word worth 14 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3I1R1I1D2B3U1G2
3 + 1 + 1 + 1 + 2 + 0 + 3 + 1 + 2 =14 PTS
DOUBLE WORD → 28TRIPLE WORD → 42
MEANING

What does mirid bug mean?