Passage: P. m. dilutus, described by Charles Wallace Richmond in 1856, is resident in the extreme northeast of Iran, northern Pakistan and northwest India. It also occurs further north, from Uzbekistan and Tajikistan east to China. Compared to P. m. montanus, it is paler, with sandy-brown upperparts.

Question: What visual traights does P.m dilutus have in comparison to P.m. montanus?
paler, with sandy-brown upperparts