These are the biggest sized mosquitos i have seen so far. They are so big that you wouldn't think of them as mosquitos. But if you observe carefully they are. The last time we(me and my roommate) saw one like this we were scared to even touch it.
Here is a picture of the mosquito that bit me some 5-8 times when i was sleeping. As you can see the body itself is as big as a coin and if you measure the whole length from tip to tip it will be more than 3 coins.