Although the number of individual donations is way down this year, the number of group contributions is up by about 15 percent. Here are the arrivals from late last week and early this:

BETWEEN $18.50 AND The employes of the Advanced Technology and Data Automation Divisions of the Defense Mapping Agency's Hydrographic/Topographic Agency ($18.50), the German Honor Society at West Springfield High School ($20), Brownie Troop 1566 of Arlington ($20), Mrs. Buck's and Mrs. Parker's third grade classes at Wayside Elementary School in Rockville ($20), the Aquia Harbor Lioness Club ($25), Leota's ladies' specialty shop of West Hyattsville ($25), the accounting employes of Western Union in McLean ($25), the Carriage Hill Leisure Club of Marlow Heights ($25), the Sure-Fit Lock & Safe Company ($25), the NAVSEA 911 Popcorn Club at the Naval Sea Systems Command ($27), the Collection Improvement Section at the Library of Congress ($28), the staff of the Unitarian Church of Arlington ($30), Guide Service of Washington, Inc. ($35), the faculty of Alexandria's Queen of Apostles School ($42), the Future Homemakers of America chapter at West Springfield High School ($50), The New America Project ($50), the support personnel at the Prince George's County Board of Education ($52), the Clinton Grove Library Club ($54.22), the employes of Perkins & Will ($65), employes of the Criminal Section of the Justice Department's Tax Division ($71), the staff of the Metropolitan Washington Council of Governments ($73.58), employes of the Washington Aqueduct Division of the U.S. Army Engineer District ($81), the Center for Applied Linguistics ($84.70 from their "Trash Novel Exchange"), Sosnik's Liquors of Northeast ($85) and the Industrial Security Directorate of the Defense Investigative Service ($95).

BETWEEN $ 100 AND$ 160: The Women's Auxiliary to the Metropolitan Washington Association of Plumbing, Heating and Cooling Contractors, Inc. ($100), the Manufacturing Department of the Teleproducts Division at Alexandria's Atlantic Research Corp. ($100 from the coffee fund), the American Legion Auxiliary to Wheaton Post 268 ($100), the Christian Youth Fellowship of the First Christian Church of Falls Church ($100), the Office of Buildings Management at the General Services Administration ($133), the employes of Cianbro Corp. working on the Woodrow Wilson Bridge ($148), the employes of the Northwest law firm of Cladouhos & Brashares ($160), employes of the American Geophysical Union ($160) and the staff of the Air Pollution Control Division of the Fairfax County Health Department (another $160).

BETWEEN $200 and the brokers at the Silver Spring office of Paine Webber ($200), the IDP Division at C & P Telephone's Fairland Data Center in Silver Spring ($222.50), the employes of the National Coal Association ($230), the Laboratory for High Energy Astrophysics at Goddard Space Flight Center ($250), the employes of De Leuw, Cather & Company Office 16 ($271.74), staffers at the Andrews Federal Credit Union at Andrews Air Force Base ($305), civilian and uniform staff of the Criminal Investigative, Special Operations, Planning and Training Divisions of the Prince George's County Police ($393), employes of the Publishing Services Branch at the Internal Revenue Service ($520) and the staff of the Office of Single Family Housing and Mortgagee Activities at the Department of Housing and Urban Development ($622).

IN FOUR FIGURES: the staff of the Officer Systems Branch, HDQA Military Systems Division, Personnel Information Systems Directorate, U.S. Army Military Personnel Center ($1,006 from an office bake sale), The Chevy Chase Land Company ($1,103), the Planning Division of Civil Works, Office, Chief of Engineers, U.S. Army Corps of Engineers ($1,722), the employes and management of Presearch Incorporated of Arlington ($2,337.50), the DCA Command and Control Technical Center ($2,700) and the employes of The Kiplinger Washington Editors and Editors Press ($4,154.15).

An exemplary performance. Thanks to every one of you from the kids at Children's Hospital.