Labus vandervechti Giordani Soika, 1958
Labus vandervechti Giordani Soika, 1958: 83; van der Vecht 1963: 9; Gusenleitner 1988: 195, 197, 198; Girish Kumar et al. 2014: 36.
Material examined.
No specimens examined.
Diagnosis.
Very closely allied to L. spiniger de Saussure, 1867 (van der Vecht 1935: 165), but the horizontal part of the propodeum more distinctly punctate, the punctures not much closer, but slightly larger, and better defined; the sides of the propodeum more shiny between the punctures (rugose and rather dull in L. spiniger), the transverse ridge at apex of propodeum more pronounced, as seen in profile forming a more distinctly projecting tooth; swollen part of metasomal petiole relatively longer, nearly half as long as the petiole; second metasomal segment relatively longer (length: width = 1.2: 1, in L. spiniger = 1.1: 1); metasomal petiole red, with narrow yellow apical band; legs ferruginous, coxae and trochanters dark brown to black, fore femur I with vague yellow spot at apex, mid and hind femora fuscous at base, hind tibiae fuscous at apex, tarsal segments 2-5 of mid legs and 1-5 of hind legs fuscous (van der Vecht 1963).
Distribution.
Indonesia.
Key to the world species of Labus de Saussure
In the below key, information on L. clypeatus van der Vecht, L. exiguus (de Saussure), L. humbertianus de Saussure, L. rufomaculatus van der Vecht, L. sumatrensis Giordani Soika and L. vandervechti Giordani Soika is extracted from the original descriptions, and the characters of other species were studied on specimens.
| 1 | Propodeum posteriorly on each side without a tooth above the apical spine formed by the submarginal carina (Figs 5, 11, 40) | 2 |
| - | Propodeum posteriorly on each side with a tooth above the apical spine formed by the submarginal carina (Figs 18, 29, 46) | 5 |
| 2 | Swollen part of metasomal petiole as long as or longer than half of the length of the petiole (Figs 4, 41) | 3 |
| - | Swollen part of metasomal petiole less than half of the length of the petiole (Fig. 12) | 4 |
| 3 | The median portion of clypeus less produced, its emargination wide medially and lateral teeth slightly blunter (Fig. 2); frontal fovea big and rounded, much larger than the anterior ocellus (Fig. 3) | L. edentatus sp. n. |
| - | The median portion of clypeus slightly more produced, its emargination narrower medially and lateral teeth sharper (Figs 37, 38); frontal fovea smaller and not distinctly defined, slightly larger than the anterior ocellus (Fig. 37) | L. pusillus van der Vecht, 1963 |
| 4 | Frons sparsely punctate and more shiny between the punctures (Figs 8, 10); total length of petiole shorter, 7.53 ×its basal width in female and 8.07 ×its basal width in male | L. sparsipunctus sp. n. |
| - | Frons coarsely and densely punctate, and duller between the punctures; total length of petiole more than 9 × basal width | L. clypeatus van der Vecht, 1935 |
| 5 | The linear part of metasomal petiole short and wide, and distinctly rugosely punctuate, total length of petiole about or less than 4.51 × basal width (Figs 16, 19) | 6 |
| - | The linear part of metasomal petiole long and narrow, and just slightly rugosely punctuate, total length of petiole at least more than 6.5 × basal width (Figs 23, 30, 32-33, 44) | 7 |
| 6 | The tooth above the apical spine of propodeum sharply acute and high, and far away from apical spine (Fig. 18); swollen part of metasomal petiole more densely punctate (Fig. 19) | L. postpetiolatus Gusenleitner, 1988 |
| - | The tooth above the apical spine of propodeum comparatively blunter and lower, and closer to the apical spine (Fig. 15); swollen part of metasomal petiole sparsely punctate (Fig. 16) | L. robustus sp. n. |
| 7 | Swollen part of metasomal petiole half of the length of the petiole | 8 |
| - | Swollen part of metasomal petiole less than half of the length of the petiole (Figs 23, 30, 32-33, 44) | 9 |
| 8 | Legs black, with the following parts yellow: fore tibiae on outerside and mid tibiae with a small mark at base (van der Vecht 1963; Girish Kumar et al. 2014) | L. humbertianus de Saussure, 1867 |
| - | Legs ferrugineous, only with some parts of femora and midtibia black (van der Vecht 1935) | L. exiguus (de Saussure, 1855) |
| 9 | Head in frontal view as long as wide, its sides rounded (Figs 24, 34-35) | 10 |
| - | Head in frontal view longer than wide, its sides somewhat flattened (Figs 20-21, 27, 31, 43, 45) | 12 |
| 10 | Clypeus distinctly punctate, punctures larger and relatively denser (Figs 34-35) | L. philippinensis Giordani Soika, 1986 |
| - | Clypeus less distinctly punctate, punctures sparser (Fig. 24) | 11 |
| 11 | Punctures on frons thicker than in the L. angularis and those on mesosoma visibly larger | L. sumatrensis Giordani Soika, 1991 |
| - | Punctures on frons sparser and those on mesosoma smaller than the above species | L. angularis van der Vecht, 1935 |
| 12 | Frons not carinate; body with red or ferruginous spots and without yellow marks | L. rufomaculatus van der Vecht, 1963 |
| - | Inter-antennal carina continued on lower part of frons; body with distinct yellow spots or bands | 13 |
| 13 | Metasomal petiole at least partly red or reddish brown, with yellow apical narrow band; frontal fovea relatively bigger (Figs 20, 28) | 14 |
| - | Metasomal petiole black, with narrow yellow apical band; frontal fovea smaller (Fig. 43) | 15 |
| 14 | The horizontal part of the propodeum punctate, the punctures comparatively smaller; the sides of the propodeum rugose and rather dull between the punctures; the transverse ridge at apex of propodeum less pronounced | L. spiniger de Saussure, 1867 |
| - | The horizontal part of the propodeum more distinctly punctate, the punctures not much closer, but slightly larger, and better defined; the sides of the propodeum more shiny between the punctures, the transverse ridge at apex of propodeum more pronounced, as seen in profile forming a more distinctly projecting tooth (Giordani Soika 1958; van der Vecht 1963) | L. vandervechti Giordani Soika, 1958 |
| 15 | In female, frontal fovea much deeper, distinctly defined, and rounded (Fig. 28); the swollen part of the metasomal petiole with uniform punctures | L. lofuensis Giordani Soika, 1973 |
| - | In female, frontal fovea shallow, longer than wide, not distinctly defined (Fig. 22); the swollen part of the metasomal petiole irregularly punctate | L. amoenus van der Vecht, 1935 |