Key to the species of Pseudeurybata Hennig

1 Postocellar seta absent (back of head with only inner and outer vertical setae, Fig. 45). Anterior margin of postpronotal lobe swollen, with a tuft of setae (Fig. 45). Distiphallus with distal section beyond phallic bulb (Fig. 49). Spermathecal ducts con- spicuously hirsute (Fig. 52). South America .................................................. P. z e ta new species

- Postocellar seta present (Fig. 25). Anterior margin of postpronotal lobe neither swollen nor with a tuft of setae. Phallus of known males ending at phallic bulb (Figs. 14, 16, 28, 41, 42). Spermathecal ducts bare. Central America and Mexico ..... 2

2 Wing clear except for dark apex (Fig. 38). Anterior part of scutum conspicuously narrowed, dorsal surface with a prominent dip (Fig. 39). Femora reddish except for contrasting black apex (Fig. 38)............... Pseudeurybata stigmatica Hennig

- Wing evenly infuscated. Anterior part of scutum not conspicuously narrowed, dorsal surface almost straight. Femora brown to black, often with yellowish rings......................................................................... 3

3 Mid and hind femora with a distal yellow ring (Fig. 32)...................................................... 4

- Mid and hind femora uniformly brown at least on distal half (Fig. 8)............................................ 6

4 Fore and hind leg with tarsomere one white (Fig. 32). Clypeus bare............ Pseudeurybata guatemalensis new species

- All tarsi brown. Clypeus finely setulose.................................................................. 5

5 Scutum orange (Fig. 1). Frontal vitta broad behind ocelli, tapered posteriorly (Fig. 2). Pale distal ring of hind femur distinct, at least twice as long as distal dark part of femur (Fig. 1).............................. Pseudeurybata alces new species

- Scutum dark, with a broad silvery median strip expanding postsuturally (Fig. 17). Frontal vitta narrowed behind ocelli and par- allel-sided posteriorly (Fig. 18). Distal ring of mid and hind femur indistinct, less than twice as long as apical dark part of femur (Fig. 17).......................................................... Pseudeurybata compeditus (Hennig)

6 Tarsomere one of foreleg white or mostly white (Fig. 24)....................... Pseudeurybata dasypogon new species

- Tarsomere one of foreleg brown......................................................................... 7

7 Thorax dark brown with a silvery median longitudinal strip (Fig. 36). Halter knob dark brown to black.......................................................................................... Pseudeurybata rufilabris (Enderlein)

- Thorax uniformly orange (Fig. 8). Halter knob orange............................. Pseudeurybata browni new species