Key to species

1. Metope from yellowish brown to dark brown above clypeus (Fig. 2). Head laterally (lora and preocular fields) yellowish brown (Fig. 1). Metopoclypeal suture straight (Fig. 4). Fore wing clavus 4/5 of whole wing length in lateral view (Fig. 3). Hind margin of female sternite VII with short semicircular processes (lobes) medially (Fig. 7). Singapore .... G. mystica (Melichar, 1899)

–. Metope black above clypeus (Fig. 15). Head laterally (lora and preocular fields) yellowish, with four dark brown bands on each side (Fig. 16). Metopoclypeal suture concave (Fig. 17). Fore wing clavus 9/10 of whole wing length in lateral view (Fig. 14). Hind margin of female sternite VII with long semicircular processes (lobes) medially (Fig. 19). Laos .... G. ridens sp. nov.