Another question that you might consider... "Does blindsight see through it?"If it's specifically echolocation, no - since sonar would be blocked in the same way light would.
Other forms of blindsight... the buzzing of that many bugs densely packed (hearing). and the scent/pheromones that those bugs give off (smell). I'd say maybe not, but debatable.
Also, it would block lifesense, since the obstruction is living. Only one that I can think of that would see through it without question would be x-ray vision.
Note: I play a rogue/cleric that has this item. If you do the math, 10 miles per hour = 88 feet per round. I can double-dash and move more than 88 feet in a round if I ever want the bugs to go away. Fun little trick.
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