1	Mentum trapezoidal (Fig. 2A)	2
–	Mentum elongate hexagonal (Fig. 2B)	3
2	Median line obvious on pro- and mesonotum	G.kangmar
–	Median line obvious on thorax dorsally and abdominal tergite I	G.himalaya
3	Ocelli evident (Fig. 2C)	4
–	Ocelli inconspicuous (Fig. 2D)	7
4	Antennal segment I longer than II	5
–	Antennal segment I shorter than II	G.cylindricollis
5	Submentum with 10 setae	G.felicitana
–	Submentum with 6 setae	6
6	Median line obvious on thorax dorsally	G.nigera
–	Median line obvious on thorax dorsally and abdominal tergite I	G.tishkovi
7	Mentum with 2 setae	G.lhorongica
–	Mentum with 12 setae	G.brucei