Library of Congress didn't know either. Your limited citation is safe:
Here is LoC's:
Author:        [Medcalfe,   ]
Title:         [Lake Champlain and Lake George, and the country
                  between the Hudson and the lakes on the west, and
Connecticut
                  River on the east.
Published:     1777?]
Description:   col. map 59 x 28 cm.
Series:        [Faden collection. 62-63]
LC Call No.:   G3802.C45 1777 .M4
Notes:         Scale ca. 1:640,000.
               Title from William Faden's Catalogue of a curious
                  and valuable collection of original maps and plans.
               Manuscript, pen-and-ink and watercolor.
               Has watermarks.
               Imperfect: Right upper corner is missing.
               Base map from "A map of the country in which the
                  army under Lt. General Burgoyne acted in the campaign
of
                  1777, shewing the marches of the army & places of the
                  principal actions. Drawn by Mr. Medcalfe & engraved by
Wm.
                  Faden" which was published in 1780 in Burgoyne's A
state of
                  the expedition from Canada, and in Faden's Atlas of
the
                  battles of the American Revolution. The manuscript
lacks "the
                  marches of the army & the places of the principal
actions."
Subjects:      Champlain, Lake, Region -- Maps, Manuscript --
                  Early works to 1800.
Series Entry:  United States. Library of Congress. Faden
                  collection. 62-63.
Control No.:   gm 71000656 /MAPS/r972

===========================
[Medcalfe,   ]
Title:         [Lake Champlain and Lake George, and the country
                  between the Hudson and the lakes on the west, and
Connecticut
                  River on the east.
Published:     1777?]
Description:   col. map 59 x 28 cm.
Series:        [Faden collection. 62-63]
LC Call No.:   G3802.C45 1777 .M4
Notes:         Scale ca. 1:640,000.
               Title from William Faden's Catalogue of a curious
                  and valuable collection of original maps and plans.
               Manuscript, pen-and-ink and watercolor.
               Has watermarks.
               Imperfect: Right upper corner is missing.
               Base map from "A map of the country in which the
                  army under Lt. General Burgoyne acted in the campaign
of
                  1777, shewing the marches of the army & places of the
                  principal actions. Drawn by Mr. Medcalfe & engraved by
Wm.
                  Faden" which was published in 1780 in Burgoyne's A
state of
                  the expedition from Canada, and in Faden's Atlas of
the
                  battles of the American Revolution. The manuscript
lacks "the
                  marches of the army & the places of the principal
actions."
Subjects:      Champlain, Lake, Region -- Maps, Manuscript --
                  Early works to 1800.
Series Entry:  United States. Library of Congress. Faden
                  collection. 62-63.
Control No.:   gm 71000656 /MAPS/r972


Tom Perrin



Warren Broderick wrote:
>
> I need the first name of a Colonial era (British?) cartographer for a bibliographical citation.  His surname is Medcalfe, and he drew two maps for Burgoyne's State of the Expedition From Canada (1780): a plan of the battlefield at Walloomsac and a map entitled "Map of the Country in which the Army under Lt. General Burgoyne acted in the Campaign of 1777."
>
> He is sometimes referred to as "M. Medcalfe," but I suspect the "M" may mean "Mr." rather than be his first initial.  Does anyone know Mr. Medcalfe's first name?