Subfamily Rhaphidophorinae:

Key to the known male Bhutanese Rhaphidophora

1) Male epiproct more or less specialised bearing a projection or a curved, narrowed or bifurcate apex (Fig. 14C, Fig.16H & Fig. 17G)............................................................................................... 2

- Male epiproct simple without long projection, disc oval, carinated all around, only at apex almost flat surface with a pair of short lateral spines directing downwards (Fig. 15F–G); ventral basal plate of epiproct triangular, gradually forming into single sclerotised spine (Fig. 15E).............................................................. R. bicuspis sp. nov.

2) Male epiproct less specialised, longer than wide; ventral basal plate of epiproct without any evident projections or specialisation........................................................................................ 3

- Male epiproct short slightly curved upward at apex (Fig. 14E & Fig. 16F), ventral basal plate of epiproct specialised (Fig. 14F & Fig. 16H)......................................................................................... 4

3) Male epiproct acute-triangular, disc carinated all around with a longitudinal groove towards apex, apex projecting behind elevated disc and with 2 obtuse dorsal small lobes....................................... R. angulata Ingrisch, 2002

- Male epiproct longer than wide, dorsal surface shallowly curved projecting behind body; basal half broad and almost parallel thereafter with 2 obtuse lateral apices (Fig. 17F–G).......................................... R. piscicauda sp. nov.

4) Male epiproct oval, lateral margins not strongly curved but grooved dorsally with a conspicuous pair of projections on distal end directed slightly backwards; ventral basal plate of epiproct with a pair of swollen lobes directed upward and a small triangular sclerotised apical lobes (Fig. 14E–G)........................................... R. bhutanensis sp. nov.

- Male epiproct oval, lateral margins less curved but deeply grooved in dorsal view and with a pair of projections on the distal end directed slightly upwards; ventral basal plate of epiproct with a pair of large lobes directed upward away from each other, apical with a pair of sclerotised ventral margin spines (Fig. 16E–H).............................. R. bilobata sp. nov.