UPDATE 1-IMM-Speculators short dlr, 1st time since March-CFTC

(Adds tabulated data on short and long positions)

NEW YORK, July 16 (Reuters) - Currency speculators erased
long dollar positions in the latest week and were betting
against the currency for the first time since March, data from
the Commodity Futures Trading Commission showed on Friday.

The value of the dollar's net short position was about
$5.02 billion in the week ended July 13, compared with a net
long position of $3.82 billion in the previous week, according
to CFTC and Reuters data.

Speculators have been long the dollar for most of 2010 and
were last betting against it in the week to March 16, when
value of the net short position was just $121 million.

The last time the value of the dollar's net short position
was larger was when it reached $11.77 billion in the week to
Dec. 8, 2009, according to Reuters calculations.

The Reuters calculation for the aggregate U.S. dollar
position is derived from the net positions of International
Monetary Market speculators in the yen, euro, British pound,
Swiss franc, Canadian and Australian dollars.

Speculators were still betting against the euro and
sterling in the latest week but trimmed short positions in both
currencies. They flipped positions on the Swiss franc, however,
going long for the first time since January, and increased bets
in favor of the yen, Australian dollar and Canadian dollar.

JAPANESE YEN (Contracts of 12,500,000 yen)

7/13/10 week 7/06/10 week

Long 63,205 62,476

Short 15,846 24,550

Net 47,359 37,926

EURO (Contracts of 125,000 euros)

7/13/10 week 7/06/10 week

Long 56,187 56,316

Short 83,237 95,225

Net -27,050 -38,909

POUND STERLING (Contracts of 62,500 pounds sterling)

7/13/10 week 7/06/10 week

Long 15,501 18,442

Short 50,172 56,519

Net -34,671 -38,077

SWISS FRANC (Contracts of 125,000 Swiss francs)

7/13/10 week 7/06/10 week

Long 18,237 7,627

Short 3,647 15,082

Net 14,590 -7,455

CANADIAN DOLLAR (Contracts of 100,000 Canadian dollars)

7/13/10 week 7/06/10 week

Long 27,952 28,549

Short 5,914 20,455

Net 22,038 8,094

AUSTRALIAN DOLLAR (Contracts of 100,000 Aussie dollars)

7/13/10 week 7/06/10 week

Long 35,209 25,885

Short 11,729 18,639

Net 23,480 7,246

MEXICAN PESO (Contracts of 500,000 pesos)

7/13/10 week 7/06/10 week

Long 36,830 30,858

Short 8,695 8,133

Net 28,135 22,725

NEW ZEALAND DOLLAR (Contracts of 100,000 New Zealand
dollars)

7/13/10 week 7/06/10 week

Long 12,683 8,093

Short 7,231 5,516

Net 5,452 2,577
(Reporting by Steven C. Johnson; Editing by Chizu Nomiyama)