Key to species of the genus Phobeticomyia of the world

1. Wing with a narrow hyaline preapical stripe, extending from extreme tip of R2+3 to preapical part of m1 cell (See Malloch 1929: 22–23, fig. 19) ............................................................................... Phobeticomyia preapicalis Malloch

- Wing with a wide hyaline stripe at extreme tip of wing ............................................................................................... 2

2. Wing with a narrow hyaline subapical stripe (constricted at middle in some species) in m1 cell ................................ 3

- Wing without a narrow hyaline subapical stripe in m1 cell (Fig. 11); surstylus with a small triangular apical process and a curved inner process with an apical tooth (Figs. 23, 25) ................................. Phobeticomyia spinosa Sasakawa

3. Wing without hyaline spot between dm-cu and subapical stripe in m1 cell, and no hyaline round median spot near CuA 1 in cua1 cell (Fig. 12) ............................................................................................................................................ 4

- Wing with a hyaline spot between dm-cu and subapical stripe in m1 cell, and with a round median spot near CuA 1 in cua1 cell (Figs. 9, 10)..................................................................................................................................................... 5

4. Epandrium with a small blunt apical process; surstylus only with a long curved inner process; aedeagus with a pair of slender coniform sclerites without processes (See Sasakawa & Pong 1990: 129, figs. 12–13)................................. ..................................................................................................................... Phobeticomyia bicolor Sasakawa & Pong

- Epandrium round apically without process; surstylus with a slender subuliform subapical process and a forcipiform inner process; aedeagus consisting of a pair of slender sclerites, a pair of triangular basal processes, a pair of acuate dorsal and lateral processes, and a hooked apical process (Figs. 28, 30, 32) ............ Phobeticomyia uncinata sp. nov.

5. Antenna scape and pedicel yellow (Figs. 1–2); surstylus with a small digitiform subapical process and a curved claviform inner process; aedeagus with a pair of subapical lateral processes and a hooked apical process in ventral view (Figs. 13, 15, 16) .................................................................................................... Phobeticomyia digitiformis sp. nov.

- Antenna scape and pedicel black (Figs. 3–4); surstylus with a broad apical process, a small bulb–like subapical process and a narrow long curved inner process; aedeagus with a pair of median teeth and a pair of acuate triangular apical processes in ventral view (Figs. 18, 20, 21) ...................................................... Phobeticomyia lunifera de Meijere