We present updated results of spectroscopic follow-up observations of a sample of 45 M dwarf candidates identified by Phan-Bao et al .
( [ 2003 ] ) based on the DENIS photometry and proper motion measurements .
Forty one of these are nearby late-M dwarfs ( d < 30 pc ) with spectral types ranging from M5.0 to M8.5 computed from the spectral indices .
One contaminant is probably an F-G main sequence star reddened by intervening dust and three stars that were not observed have previous classifications as M dwarfs in the literature .
In this paper , we identify three M7.5 , five M8.0 , one M8.5 dwarf and confirm two new M8.0 dwarf members of the 25 pc volume .