Key to the males of Merogomphus spp. of the Western Ghats

1 Mid-dorsum of abdomen without extensive yellow markings.................................................. 2

Mid-dorsum of abdomen with extensive yellow markings (Fig. 15g –h).............................. M. longistigma

2 Cerci tips approaching each other (Fig. 15f, i, l); genital ligula has short flagella................................... 3

Cerci tips parallel to each other (Fig. 15c), genital ligula has long flagella........................... M. aryanadensis

3 Middle yellow stripe on lateral pterothorax is inconspicuous, yellow mark on mid-dorsum of S3 is absent (Fig.15d–e)............................................................................................ M. flavoreductus

Middle yellow stripe on lateral pterothorax is prominent, yellow mark on mid-dorsum of S3 is present (Fig. 15j–k).......................................................................................... M. tamaracherriensis

Key to the females of Merogomphus spp. of the Western Ghats

1 Mid-dorsum of abdomen without extensive yellow markings.................................................. 2

Mid-dorsum of abdomen with extensive yellow markings......................................... M. longistigma

2 Yellow mark on mid-dorsum of S3 is absent................................................................ 3

Yellow mark on mid-dorsum of S3 is present.............................................. M. tamaracherriensis

3 Middle yellow stripe on lateral pterothorax is prominent......................................... M. aryanadensis

Middle yellow stripe on lateral pterothorax is inconspicuous...................................... M. flavoreductus