TOKYO, Aug. 18 (SS)—Thirty-one persons were reported dead or missing early today as Typhoon Grace slashed across J a-pan’s southern island' of Kyushu and whirled toward Honshu.Authorities feared that thedeath toll would mount rapidly as Grace—which pounded Okinawa over the weekend—pushed across Kyushu and headed for the southern Honshu cities“ 4 •of Hiroshima and Yamaguchi.Velocity LessensAccording to Tokyo Weather Central, the killer storm slowly is diminishing in force as it moves across land areas, but it still poses a major threat to the areas in its path. It is-expeeted to pick up speed and move out to sea to the north of Tokyo sometime Friday.Winds clocked at 151 miles an hour roared into Kyushu’s southernmost prefecture, Kagoshima, at 3 a.m. One source reported that 251 houses were destroyed and another 4,400 dwellings were flooded in Kagoshima.Landslide TollLargest single casualty toll so far came from Miyazaki Prefecture, where 22 persons were buried alive following landslides caused by torrentialrains.In some mountain regions as much as 20 inches of rain is reported to have fallen, causing landslides and flash floods which may bring death and damage for several days.Nine ships have been report-(Continued on Page 6 Col. 1) * * *