Key to Vombisidris workers

Key to known species of Vombisidris based on workers (updated from Xu & Yu (2012) by Jeenthong et al. (2023)).

1

 * Subocular groove entirely absent (Fig. 3A, Papua New Guinea) Vombisidris bilongrudi
 * Subocular groove at least present from mandibular insertion to eye (Fig. 3B-C)

2
Guinea) Vombisidris acherdos continuing along the side to lateroccipital margin (Fig. 3C)
 * Subocular groove incomplete, running from mandibular insertion to anteroventral margin of eye, never beyond eye (Fig. 3B, Papua New
 * Subocular groove complete, running from mandibular insertion to anteroventral margin of eye, then passing through a shallow angle and

3
longitudinally rugulose (Indonesia) Vombisidris philax tergite entirely smooth
 * In profile view, dorsum of mesonotum with a pair of short vertical sharp teeth at each side (Fig. 3D); anterior 2/3 of first gastral tergite
 * In profile view, dorsum of mesonotum without a pair of vertical sharp teeth, at most with a pair of blunt prominence (Fig. 3E); first gastral

4
less distinct (Fig. 3G)
 * In profile view, petiolar node dome-like or roughly triangular, dorsum roundly convex, without distinctly differentiated dorsal face (Fig. 3F)
 * In profile view, petiolar node roughly trapezoidal, with distinctly differentiated dorsal face, anterodorsal and posterodorsal corners more or

5

 * In profile view, metanotal groove shallow but obviously depressed
 * In profile view, metanotal groove entirely absent

6
weakly curved down, longer than propodeal dorsum; postpetiolar node evenly convex (Fig. 3H) (China: Tibet) Vombisidris tibeta straight, as long as propodeal dorsum; postpetiolar node strongly convex (Fig. 3I) (China: Hunan Province) Vombisidris umbrabdomina
 * In full-face view, posterior margin of head weakly concave; anterior clypeal margin strongly convex; in profile view, propodeal spines
 * In full-face view, posterior margin of head weakly convex; anterior clypeal margin weakly convex; in profile view, propodeal spines

7

 * In profile view, petiolar node roughly triangular, dorsal corner distinct (Fig. 4A)
 * In profile view, petiolar node dome-like, dorsal corner indistinct (Fig. 4B)

8
petiolar node convex; head and mesosoma blackish brown, gaster lighter brown (India) Vombisidris occidua of petiolar node almost straight; head and mesosoma yellowish brown, gaster blackish brown (India) Vombisidris humboldticola
 * In profile view, propodeal spines about as long as propodeal declivity; postpetiolar node evenly convex; in dorsal view, lateral sides of
 * In profile view, propodeal spines distinctly longer than propodeal declivity; postpetiolar node strongly convex; in dorsal view, lateral sides

9

 * In profile view, petiole peduncle longer than petiolar node (Fig. 4C)
 * In profile view, petiole peduncle as long as or shorter than petiolar node (Fig. 4D)

10

 * In profile view, propodeal spine short and straight (Fig. 4E); smaller species (HW 0.56–0.63) Vombisidris satunensis


 * In profile view, propodeal spine long and distinctly downcurved (Fig. 4F); larger species (HW 0.63–0.71 mm) Vombisidris nahet

11

 * Entire body black to dark brown; larger species (HW 0.88–0.96 mm) Vombisidris regina
 * Entire body yellow; smaller species (HW 0.56–0.63 mm) Vombisidris freyae

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 * In profile view, metanotal groove strongly depressed and trenchlike
 * In profile view, metanotal groove vestigial to absent, without a trench-like notch

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(Fig. 4G) (Brunei) Vombisidris xylochos
 * In profile view, promesonotum nearly straight, anterodorsal corner angled; propodeal spine about two times as long as propodeal dorsum
 * In profile view, promesonotum weakly convex, anterodorsal corner rounded; propodeal spine about as long as propodeal dorsum (Fig. 4H)

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first gastral tergite finely superficially reticulate (Fig. 5A) (Indonesia) Vombisidris lochme petiolar node; first gastral tergite almost completely smooth (Fig. 5B) (Malaysia) Vombisidris dryas
 * In full-face view, lateral sides of head divergent behind eyes; in profile view, anterior peduncle shorter than dorsal face of petiolar node;
 * In full-face view, lateral sides of head nearly parallel behind eyes; in profile view, anterior peduncle about as long as the dorsal face of

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(Malaysia) Vombisidris harpeza
 * In profile view, petiole peduncle relatively short, shorter than dorsal face of petiolar node, the dorsal face nearly straight (Fig. 5C)
 * In profile view, petiole peduncle relatively long, about as long as the dorsal face of petiolar node, the dorsal face weakly convex (Fig. 5D)

16

 * In profile view, anterodorsal corner of petiolar node bluntly angled, higher than posterodorsal corner, the latter rounded
 * In profile view, both anterodorsal and posterodorsal corners of petiolar node bluntly prominent, at the same level

17
propodeal declivity; ventral face of petiole nearly straight; dorsal surface of mesosoma with short blunt hairs (Australia) Vombisidris australis ventral face of petiole concave; dorsal surface of mesosoma with moderate long tapered hairs (Australia) Vombisidris renateae
 * In full-face view, posterior margin of head straight; in profile view, propodeal spines relatively short, shorter than or about as long as
 * In full-face view, posterior margin of head evenly convex; in profile view, propodeal spines relatively long, longer than propodeal declivity;

18
blunt hairs; color yellow to lighter brown (Fig. 5E) (Indonesia) Vombisidris jacobsoni moderate long tapered hairs; color blackish brown (Fig. 5F) (Philippines) Vombisidris philippina
 * In full-face view, posterior margin of head nearly straight; anterior clypeal margin weakly convex; dorsal surface of mesosoma with short
 * In full-face view, posterior margin of head weakly convex; anterior clypeal margin strongly convex; dorsal surface of mesosoma with