Key to species of Paraphloeostiba of Papua New Guinea

1 Laterobasal portions of pronotum widely and deeply concave in front of posterior angles............................ 2

- Laterobasal portion of pronotum slightly concave in front of posterior angles or evenly narrowed posteriad.............. 3

2 Middle portion of pronotum with two distinct and wide paramedian impressions. Apical portions of median lobe and parameres narrow (Fig. 7). Body reddish-brown. Habitus as in Fig. 1. Body length: 1.78–2.10 mm ................. P. conjuncta sp.n.

- Middle portion of pronotum without visible paramedian impressions. Apical portions of median lobe and parameres wide (Fig. 15). Body yellow-brown. Habitus as in Fig. 3. Body length: 2.00– 2.35 mm ........................... P. flaveola sp.n.

3 Forebody very glossy, with very fine and sparse punctation and fine microsculpture. Median lobe narrow, parameres not exceeding apex of median lobe (Fig. 26). Female accessory sclerite missing. Body yellow-brown to reddish-brown. Habitus as in Fig. 6. Body length: 1.40–2.34 mm .......................................................... P. ullrichi sp.n.

- Forebody less glossy, with moderately large and dense punctation and coarse microspulpture. Median lobe moderately broad, parameres slightly longer than apex of median lobe. Female accessory sclerite present............................... 4

4 Laterobasal portions of pronotum more or less evenly narrowed toward postertior angles. Female accessory sclerite as in Fig. 24. Body yellow-brown. Habitus as in Fig. 5. Body smaller: 1.80–1.85 mm ................. P. papuana (Cameron, 1931)

- Lateroabasal portions of pronotum slightly concave in front of posterior angles. Body darker and larger................. 5

5 Microsculpture of head and pronotum moderately fine. Median lobe and apical portions of parameres narrow (Fig. 25 in Shavrin (2020)). Habitus as in Fig. 4. Body length: 2.10–3.50 mm .................... P. gayndahensis (MacLeay, 1873)

- Microsculpture of head and pronotum coarse. Median lobe and apical portions of parameres moderately wide (Fig. 11). Habitus as in Fig. 2. Body length: 2.56 mm ................................................. P. coriacea (Cameron, 1952)