New York, June 22. The steamer Locust Point, from New Orleans the 15th, arrived tonight. She brings no copies ot the Era, and the other papers contain no news whatever. The purser reports that nothing had been received lrom Port Hudson, excepting that fighting continued there, no one knowing the result.The tow-boat Poston was captured by the rebels on the 9th, who extemporized her into a pirate, capturing the bark Lenox, burning the vessel and cargo, and carrying oil Captain Cole and two mates as prisoners.