$ 0 0 Sri Lanka defeated Bangladesh by an innings and 248 runs with a day to spare in the first Test in Dhaka on Thursday to take the lead in the two-match series.Bangladesh, trailing by a huge 498-run margin on first innings, were bowled out for 250 in their second knock after lunch on the fourth day at the Sher-e-Bangla stadium. Off-spinner Dilruwan Perera claimed five wickets and seamer Suranga Lakmal took three as the hosts were dismissed in 51.5 overs. Sri Lanka have now defeated Bangladesh in 14 of their 15 Tests, eight of them by an innings margin. The other match was drawn. On their previous tour in 2008-09, Sri Lanka had won the first Test by 107 runs and the second by 465 runs. Bangladesh, who languish at the bottom of the Test rankings at number 10 -- lower than unfancied Zimbabwe -- have lost 68 of their 82 Tests since gaining full status in 2000. The second Test starts in the port city of Chittagong on February 4. It will be followed by two Twenty20 matches and three one-day internationals.