WHAT'S EATING ERIN GRAPE?

I can deal with mosquitoes even though I suffer allergic reactions to their bites. My arms and legs are spotted with red dots the size of (US) quarters which are swollen and itchy. I can deal with the random cockroach that finds its way into our house and chases me throughout the rooms until Chico can dispose of it. I can deal with houseflies that are just a nuisance and nothing more. What I cannot deal with, are whatever species of insect that bites me hard and deep enough to leave puncture wounds which scab over almost immediately and leave the area numb for a few days. What are these things???