Muskrat-houses begun.

September 11.

Loudly the mole cricket creaks by mid-afternoon. 

Muskrat-houses begun.

H. D. Thoreau, Journal, September 11, 1855 

The mole cricket creaks by mid-afternoon See August 26, 1859 ("The creak of the mole cricket has a very afternoon sound");September 20, 1855 ("Tried to trace by the sound a mole cricket, —- thinking it a frog, — advancing from two sides and looking where our courses intersected, but in vain."); September 27, 1855 ("I traced the note of what I have falsely thought the Rana palustris, or cricket frog, to its true source [and] I found a mole cricket (Gryllotalpa brevipennis)."); September 27, 1856 ("The creak of the mole cricket sounds late along the shore.") 

Muskrat-houses. See September 10, 1858 ("A musquash-house begun."); September 20, 1855 ("Open a new and pretty sizable muskrat-house with no hollow yet made in it"); September 26, 1857 ("I see musquash-houses"); October 15, 1851 ("The muskrat-houses appear now for the most part to be finished."); October 16, 1859 ("I see the new musquash-houses erected, conspicuous on the now nearly leafless shores. To me this is an important and suggestive sight . . . I remember this phenomenon annually for thirty years. A more constant phenomenon here than the new haystacks in the yard, for they were erected here probably before man dwelt here and may still be erected here when man has departed. For thirty years I have annually observed, about this time or earlier, the freshly erected winter lodges of the musquash along the riverside . . . So surely as the sun appears to be in Libra or Scorpio, I see the conical winter lodges of the musquash") See also A Book of the Seasons, by Henry Thoreau, the Musquash