. Bulletin of the British Ornithologists' Club. Birds. P. Alstrom & U. Olsson 39 1990 110(1). Figure 1. Distribution of (nominate) Phylloscopus proregulusWW and P. (p.) chloronotus (see text) (including simlaensis) ////. Based on Cheng (1987), Harrison (1982) and personal experience. chloronotus in Nepal in 1983 and in China in 1986, 1987 and 1989; and simlaensis in Kashmir in 1983. We are subsequently of the opinion that P. proregulus (sensu lato) should be divided into 2 species, P. proregulus (monotypic) and P. chloronotus (with subspecies chloronotus and simlaensis). Alstro
. Bulletin of the British Ornithologists' Club. Birds. P. Alstrom & U. Olsson 39 1990 110(1). Figure 1. Distribution of (nominate) Phylloscopus proregulusWW and P. (p.) chloronotus (see text) (including simlaensis) ////. Based on Cheng (1987), Harrison (1982) and personal experience. chloronotus in Nepal in 1983 and in China in 1986, 1987 and 1989; and simlaensis in Kashmir in 1983. We are subsequently of the opinion that P. proregulus (sensu lato) should be divided into 2 species, P. proregulus (monotypic) and P. chloronotus (with subspecies chloronotus and simlaensis). Alstrom, Colston & Olsson (1990) indicate the likelihood of a new species, which has possibly been overlooked because of its close similarity to sympatric chloronotus. Morphological differences between proregulus and chloronotus I simlaensis Morphologically, proregulus and chloronotusjsimlaensis are extremely similar. In fresh plumage, the supercilium and median crown-stripe and often also the ear-coverts, chin, throat and wing-bars are much more yellow in proregulus. Especially in front of and above the eye, the super- cilium is generally bright yellow in proregulus, while it is very pale yellow- ish, generally looking off-white or pale huffish, in chloronotus j simlaensis. The supercilium also tends to be slightly broader in front of the eye in proregulus. Moreover, proregulus is slightly greener, less brownish- tinged, on the mantle when fresh, especially compared to chloronotus, which is also darker. In fresh plumage, simlaensis is more buffish below than the other 2 forms. In worn plumage the differences in colouration between the 3 forms are less obvious. There are only slight on-average differences in the wing-formula; proregulus has marginally shorter 10th primary mm> primary coverts, as opposed to mm in chloronotus j simlaensis; in proregulus the 9th falls between 2nd and 4th, but in chloronotus}simlaensis between the tips of the secondaries and the 3rd
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