Key for New World species of Argopistes

1. Body rounded in dorsal view and strongly convex in lateral view, almost hemispherical (Figs 20, 21); aedeagus strongly arched in lateral view (Fig. 23); spermathecal receptacle elongate, nearly parallel-sided (Fig. 24).................. A. rubicundus

– Body oblong oval in dorsal view and convex in lateral view (Figs 1–3); aedeagus straight or nearly straight in lateral view (Figs 5, 14, 32, 46); spermathecal receptacle ovoid, with outer side straight and inner side convex (Figs 7, 17, 33, 47)..... 2

2(1). Bare, basal part of first metatarsomere about as long as apical part covered with setae...................... A. turnbowi

– Bare, basal part of first metatarsomere longer than apical part covered with setae................................... 3

3(2). Aedeagus with short laminae covering dorsal opening, not projecting beyond apical part of aedeagus (Fig. 32)... A. scyrtoides

– Aedeagus with long laminae covering dorsal opening, projecting beyond apical part of aedeagus (Figs 6, 14–16, 46)...... 4

4(3). Tip of aedeagus bent dorsally in lateral view (Fig. 46), vaginal palpus more or less triangular in shape with median side much shorter than lateral (Fig. 48).................................................................... A. woodleyi

– Tip of aedeagus bent ventrally in lateral view (Figs 46), vaginal palpus more or less trapezoidal in shape (Fig. 8) [if more or less triangular, posterior margin strongly sinusoidal (Fig. 18)].................................................. 5

5(4). Two apical antennomeres darker than rest of antenna; legs dark brown to reddish brown; posterior margin of vaginal palpus slightly sinusoidal (Fig. 8); spermathecal pump abruptly narrowing apically, evenly curved towards receptacle (Fig. 7); aedeagus slender, with apical part only slightly wider than middle in ventral view (Fig. 5)................... A. coccinelloides

– Two apical antennomeres as light as rest of antenna; legs yellowish; posterior margin of vaginal palpus strongly sinusoidal (Fig. 18); spermathecal pump gradually narrowing apically, sinusoidal (Fig. 17); aedeagus robust, with apical part significantly wider than middle in ventral view (Figs 14–16).................................................... A. coronatus