The mammoth wasp , Megascolia maculata , is a very large wasp ( the largest in Europe ) , with the female reaching up to 6 centimetres ( 2.4 in ) , .
The male is smaller .
The mammoth wasp , Megascolia maculata , is a very large wasp ( the largest in Europe ) , with the female reaching up to 6 centimetres ( 2.4 in ) , whereas the male is smaller .