This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Dark brownish-gray in color.

adj. of a dark brownish-gray color; dark or dusky

adj. Brown or grayish black; darkish.

Brown; brown tinged with gray; of a dark, swarthy color.

adj. of something having a dusky brownish grey color

"“Only the females have been examined” but I predict the males will show themselves to be fuscous."

chromatic   

Colours   

darkish   

martyr-like    license-plate    only    well-dried    Mimi    thoughtful-looking    weary-eyed    heterogenous    accentless    serenest