S. I. Hayakawa, Choose the Right Word (1968), makes this distinction between stingy and miserly:
Stingy emphasizes a lack of generosity, especially the reluctance to spend money. [Example omitted.] Miserly refers more to the hoarding of money or property than either the gluttonous consumption or the stingy use of it. [Example omitted.]
James C. Fernald, Funk & Wagnalls Standard Handbook of Synonyms, Antonyms & Prepositions (1947) offers this discussion under the general heading "Miserly":
Miserly and niggardly persons seek to gain by mean and petty savings; the miserly by stinting themselves,the niggardly by stinting others. ...
The avaricious and rapacious are ready to reach out for gain; the parsimonious, miserly, and niggardly prefer the safe and less adventurous way of avoiding expenditure. Greedy and stingy are used not only of money but often of other things, as food, etc. The greedy child wishes to enjoy everything himself; the stingy child, to keep others from getting it.
and this discussion under the general heading "Frugality":
Frugality is a withholding of expenditure, or sparing of supplies or provision, to a noticeable and often to a painful degree ... Frugality exalted into a virtue to be practiced for its own sake, instead of as a means to an end, becomes the vice of parsimony.
... Miserliness is the denying oneself and others the ordinary comforts or even necessaries of life, for the mere sake of hoarding money.
And Webster's Dictionary of Synonyms (1942) has this comment in the entry for "stingy":
Stingy, the ordinary colloquial term, implies mainly a lack of generosity: the term is applicable, therefore, whenever there is a suggestion of a mean or illiberal spirit [examples omitted]. ...Miserly implies penuriousness but it stresses sordid avariciousness as the motive [examples omitted].
and this comment in the entry for "sparing":
Frugal suggests the absence of all luxury and lavishness, especially in food, ways of living, dress, and the like; positively it implies simplicity, temperance, and often, content. [Example omitted.]