Key to species of Neoidiotypa Osten-Sacken

1 Postpronotal lobe black, scutum (Figs. 1, 2, 72, 73) and abdomen (Figs. 8, 16, 17, 78) entirely black.................... 2

- Postpronotal lobe yellow, scutum brown or black, with two parallel, yellow, golden yellow or yellowish white stripes (Figs. 41, 45, 61, 81). Abdomen pale brown (Figs. 28, 42), brown (Figs. 63, 96) or black (Fig. 52), with yellow basal bands on tergites 2–4................................................................................................ 3

2 Wing about as long body, slightly exceeding tip of abdomen (Fig. 73) and with spurious vein free in cell r1 (Fig. 77). Palpus obovate, apex distinctly wider than base (Fig. 76). Orbital seta reduced (Fig. 76). Proepimeral seta reduced and katepisternal seta absent. Fore tarsomeres distinctly thicker than mid and hind tarsomeres. Abdomen of female distinctly petiolate, basal three-fourths of syntergite 1+2 distinctly narrow than others tergites (Fig. 78). (Costa Rica)..... Neoidiotypa nigra sp. nov.

- Wing longer than body, clearly exceeding tip of abdomen (Figs. 2, 12), and without spurious vein (Fig. 1). Palpus linear, apex as wide as base (Fig. 5). Orbital seta developed (Fig. 5). Proepimeral and katepisternal setae strong. Fore tarsomeres as thick as mid and hind tarsomeres. Abdomen of female sligtly petiolate, basal three-fourths of syntergite 1+2 slightly narrower than others tergites (Fig. 12). (Costa Rica)................................................ Neoidiotypa alamagna sp. nov.

3 Coxae brown; mid and hind femora with large dark brown or brown marks. Orbital, ocellar, inner and outer verticals and postocellar setae rust brown. Scutum brown and rust brown with yellowish white stripes and bands (Figs. 19, 41). Female with syntergite 1+2 with basal dark brown mark, distinctly darker than the remainder of abdomen (Fig. 35, mark indicated by black arrow). (Cuba, Dominican Republic).......................................... Neoidiotypa appendiculata (Loew)

- Coxae yellow; mid and hind femora entirely yellow or with small brown marks. Orbital, ocellar, inner and outer verticals and postocellar setae black. Scutum black with yellow or golden yellow stripes and bands (Figs. 45, 61, 81). Female with syntergite 1+2 without basal mark, base similar in color to the rest of abdomen (except yellow basal bands on tergites 3–5)........ 4

4 One spurious vein on vein R2+3 directed into cell r1 (Fig. 62). Genal seta and setae on scutum golden, except postsutural supraalar seta, black. Ocellar seta absent. Abdomen covered with yellow setulae (Fig. 63). (Mexico).................................................................................................... Neoidiotypa mexicana sp. nov.

- One spurious vein reduced, free in cell r1, not connected to vein R2+3 (Fig. 51), or two opposite spurious veins on vein R2+3 (Fig. 96), or spurious vein absent. Genal seta and setae on scutum black. Ocellar seta present. Abdomen covered with black setulae.................................................................................................... 5

5 Two opposite spurious veins on vein R2+3 (Fig. 96). Postpronotal seta developed, distinctly longer and more robust than setulae around it. Postsutural dorsocentral seta robust and long. Thorax of female generally with small brown spots on certain portions (e.g., anepimeron and meron (Fig. 86), and postmetacoxal bridge area), similar to spots of a cheetah (Fig. 86). (Costa Rica)................................................................................. Neoidiotypa sticta sp. nov.

- One spurious vein reduced and free in cell r1 (Fig. 51) or spurious vein absent. Postpronotal seta very reduced, slightly longer and more robust than setulae around it. Postsutural dorsocentral seta very reduced, slightly more robust than setulae around it. Thorax of female without spots similar to those of a cheetah. (Costa Rica).................. Neoidiotypa flaviatra sp. nov.