. Bonner zoologische Monographien. Zoology. 314 AEGITHALIDAE Aegithalos Three species occur in Nepal, all breed (iouschistos, niveogularis, concinnus). They are se- parated by altitudinal preferences and by their distributional limits along the Himalayan main axis which are apparently caused by differing ecological requirements. Ae. concinnus ranges all over the country and inhabits the lowest belt. Ae. iouschistos hves in a higher belt and its western limit is situated on the southern slopes of Dhaulagiri. Finally, niveo- gularis is confined to dry areas; its easternmost outposts reach NW Dha
. Bonner zoologische Monographien. Zoology. 314 AEGITHALIDAE Aegithalos Three species occur in Nepal, all breed (iouschistos, niveogularis, concinnus). They are se- parated by altitudinal preferences and by their distributional limits along the Himalayan main axis which are apparently caused by differing ecological requirements. Ae. concinnus ranges all over the country and inhabits the lowest belt. Ae. iouschistos hves in a higher belt and its western limit is situated on the southern slopes of Dhaulagiri. Finally, niveo- gularis is confined to dry areas; its easternmost outposts reach NW Dhaulagiri. AtJeast du- ring the breeding season, none of the species have been found in close proximity to one another (for distribution of iouschistos and niveogularis in the Himalayan region cf. Fig. 100). Aegithalos niveogularis niveogularis (Gould) Taxonomic notes: The relationships of the small Aegithalos tits have often been treated but never clarified in detail. The short-tailed Ae. iouschistos seems to be even more iso- lated than the grey-faced Ae. fuliginosus from Central China. The latter apparently some- times hybridizes with Ae. n. bonvaloti (Kleinschmidt & Weigold 1922; Birckhead 1937:13-14). Most surprising is the great similarity between niveogularis (W Himalaya) and sharpei (Mt. Victoria), which was already pointed out by Vaurie (1957:18). Only in. Fig. 100: Distribution of two Aegithalos species in the Himalayan region. - Ae. niveogularis {\: Ae. n. niveogularis; 3: Ae. n. bonvaloti and Ae. n. obscuratus [spur to the N]; 4: Ae. n. sharpei); Ae. iou- schistos (2). - Maps drawn from data in Wunderlich (1989a, 1991).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig
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