Key to Latheticomyia species

1 Postpedicel short and rounded (Fig. 46). Mexico........................................ L. rotundicornis Wheeler

- Postpedicel elongate and somewhat subsquared or subrectangular (Figs 1, 14, 32)................................. 2

2 Scutum dark without median yellow stripes (Fig. 49). United States, Central America................ L. tricolor Wheeler

- Scutum with median yellow stripe (Figs 3, 16, 34, 47, 48).................................................... 3

3 Scutum with median yellow stripe posterior to transverse suture (Figs 16, 47)..................................... 4

- Scutum with median yellow stripe continuing to posterior margin of scutum and almost reaching anterior margin (Figs 3, 34, 48)................................................................................................. 5

4 Scutum with median yellow stripe triangular (Fig. 47). Fore coxa yellow (Fig. 50). Hind femur yellow, with large brown spots subbasally and apically (Fig. 50). Nicaragua................................................ L. infumata Wheeler

- Scutum with median yellow stripe V-shaped (Fig. 16). Fore coxa brown (Fig. 14). Hind femur entirely brown (Fig. 14). Peru..................................................................................... L. peruana sp. nov.

5 Scutum with yellow stripe undivided and narrower anteriorly (Fig. 34). Fore tarsomeres dark brown (Fig. 32). Peru.............................................................................................. L. xantha sp. nov.

- Scutum with yellow stripe divided anteriorly, leaving a brown line medially. Fore tarsomeres yellow to light brown...... 6

6 Yellow stripe between dorsocentral rows with a narrow brown stripe along midline (Fig. 3). Fore coxa yellow (Fig. 1). Peru.................................................................................... L. longiterebra Hennig

- Yellow stripe along median line of scutum with a large brown stripe (Fig. 48). Fore coxa dark brown (Fig. 51). United States....................................................................................... L. lineata Wheeler