Meng (2001) lists the following language varieties for Numao.
Numao 努茂 (Nu Mhou, autonym: nu22m̥ou11) - 1,715 speakers in Libo County, Guizhou; representative dialect: Yaolu Township, Libo County 荔波瑶麓瑶族乡
Numao 努茂 (Nu Mhou, White-Trouser Yao 白裤瑶, autonym: nu22m̥ou11) - about 1,200 speakers in the townships of Yaolu 瑶麓 and Jiarong 佳荣
Dongmeng 冬孟 (Long-Shirt Yao 长衫瑶, autonym: toŋ11nu22,toŋ11m̥uŋ11) - about 400 speakers in the townships of Maolan 茂兰, Dongtang 洞塘, and Weng'ang 翁昂
Zhou (2013:29) lists the following three varieties of Numao and also provides 400-word vocabulary lists for them.
White-Trouser Yao 白裤瑶 (autonym: təu51 m̥o33) in Yaoshan Township 瑶山乡
Green Yao 青瑶 (autonym: mu51 m̥ɑu33) in Yaolu Township 瑶麓乡
Long-Shirt Yao 长衫瑶 (autonym: tən33 m̥o55) in Yaozhai 瑶寨, Dongtang Township 洞塘乡
The Guizhou Province Gazetteer (2002) lists the following autonyms for these villages in Libo County, Guizhou.
nu55m̥au33: Yaolu 瑶麓
təu55m̥u55: Yaoshan 瑶山
tuŋ33m̥uŋ33: Yao'ai 瑶埃
References
12Meng, Chaoji 蒙朝吉 (2001). Yáozú Bùnǔyǔ fāngyán yánjiū 瑤族布努语方言研究 [A Study of the Bunu Dialects of the Yao People] (in Chinese). Beijing: Minzu chubanshe.