MAYBE THE NEXT travel report to constituents will be entitled "How You Spent for My Summer by William L. Scott" - for once again, the junior senator from Virginia is on the move at public expense. This time he's winging his back to Latin America for his second multination tour of that region in 36 days. According to an aide, Mr. Scott decided to go back "essentially to get answers to further questions" left from his 10-day, three-nation trip last month. Certainly that last trip did raise a few questions, not the least of which was why he wrangled such a junket in the first place.

Having long ago announced that he is not seeking re-election next year. Sen. Scott has been a most mobile lame duck, flapping around the globe at the drop of an appropriation. He's managed to visit 34 countries on congressional "study missions" in the past four years without so much as one memorable finding. Still, as an editorial in the Norfolk Virginian-Pilot suggested, "it may be an open question whether it is better to get Mr. Scott out of the country or keep him in the Senate. "Citing a magazine story that described Sen. Scott as the "dumbest" member of the Senate which you may remember prompted him to hold a press conference and issue a denialt, the editorial said. "But the frequency of travel would seem to prove one thing. Those who called him the 'dumbest' on Capitol Hill were wrong."

Actually, were it not for the fact that Sen. Scott has never prodiced a substantive piece of legislation in his three terms in the House and one in the Senate, his travels would not seem quite so unusual. A recent survey by United Press International showed that more than 60 members of Congress are traveling to 39 countries and Alaska and Hawaii during this August recess. Some of these trips really do produce useful research for future legislative deliberations. But in the case of Sen. Scott, the prospect is dim, indeed.