Dilobocondyla, Santschi, 1910

Chen, Zhilin, Li, Wenjie & Zhou, Shanyi, 2019, Taxonomic review of the ant genus Dilobocondyla from China (Hymenoptera: Formicidae), with a revised key to the known species, Zoological Systematics 44 (2), pp. 132-139 : 137-138

Key to worldwide species of Dilobocondyla based on worker castes (synthesized from Wheeler (1924), Bharti & Kumar (2013) and Zettel & Bruckner (2013); most figures cited from AntWeb).

1. Head in full-face view with posterior margin strongly and continuously concave (except for D. fulva ) (Figs ANTWEB1008114, CASENT0914066) (Philippines) ......................................................................................................................................................... 2

Head in full-face view with posterior margin nearly straight or only weakly concave in middle (Figs ANTWEB1008116, CASENT0914065)...............................................................................................................................................................................8

2. Petiole with a sharp and highly raised transverse ridge (Fig. ANTWEB1008114); anterodorsal face of postpetiole with conspicuous longitudinal rugae (Fig. ANTWEB1008114; Philippines). ........................................................ D. carinata Zettel & Bruckner, 2013

Petiole without transverse ridge (Fig. ANTWEB1008115); anterodorsal face of postpetiole differently sculptured, without conspicuous longitudinal rugae (Fig. ANTWEB1008115)...................................................................................................................3

3. Mesosoma entirely or chiefly blackish brown or black (Figs ANTWEB1008117, ANTWEB1008118, CASENT0904711) ...............4

Mesosoma yellowish to light brown (Figs ANTWEB1008115, CASENT0908982, FOCOL 1970).....................................................6

4. Antennal scrobe moderately developed, dorsally limited by fine frontal carina that posteriorly fading and not reaching posterior corners of head (Fig. CASENT0914066; Indo-Australian Region) ......................................................... D. selebensis (Emery, 1898)

Antennal scrobe strongly developed, dorsally limited by prominent frontal carina that reaches posterior corner of head (Figs ANTWEB1008117, ANTWEB1008118) .............................................................................................................................................5

5. Gastral tergite I with yellow base (Fig. ANTWEB1008117; Philippines).................................... D. rugosa Zettel & Bruckner, 2013

Gastral tergite I entirely dark (Fig. ANTWEB1008118; Philippines) ........................................... D. silviae Zettel & Bruckner, 2013

6. Frontal carinae not continuing to posterior corners of head and not so prominent; antennal scrobes moderately deep (Fig. FOCOL1970; Australia and New Guinea) .................................................................................................................... D. cataulacoidea (Stitz, 1911)

Frontal carinae prominent, continuing to posterior corners of head; scrobes deeper............................................................................7

7. Boundary unconspicuous between dorsum of propodeum and declivity. Dorsum of mesosoma with reticulation, interspaces smooth and shining (Fig. CASENT0908982; Singapore)......................................................................................... D. fulva Viehmeyer, 1916

Boundary conspicuous between dorsum of propodeum and declivity. Dorsum of mesosoma with irregular rugae, appear dull (Fig. ANTWEB1008115; Philippines)................................................................................................... D. chapmani Wheeler, W.M., 1924

8. Mesosoma, petiole, postpetiole and gaster almost unanimously color (Figs CASENT0908983, CASENT0914065, ANTWEB1008116) ............................................................................................................................................................................................................9

Mesosoma, petiole, postpetiole and gaster distinctly bicolor (Figs CASENT0178565, ANTWEB1008027) .................................... 14

9. Anterior margin of pronotum with distinct ridge (Sri Lanka) ........................................................................ D. didita (Walker, 1859)

Anterior margin of pronotum without ridge. ...................................................................................................................................... 10

10. Posterior margin of head nearly straight. Petiole relatively shorted, with DPI ≥0.60 (Fig. ANTWEB1008116; Philippines)................ ..................................................................................................................................................... D. oswini Zettel & Bruckner, 2013

Posterior margin of head with concavity at its middle. Petiole relatively elongated, with DPI≤0.52 (Fig. CASENT0914065).........11

11. Dorsal margin of propodeum in lateral view distinctly lower than pronotum (Figures see Varghese (2006); India).............................. ........................................................................................................................................................... D. bangalorica Varghese, 2006

Dorsal margin of propodeum in lateral view almost at same level with pronotum, or slightly lower than pronotum (Fig. ANTWEB1008030) ........................................................................................................................................................................... 12

12. Body brownish black; frontal triangle indistinct (Fig. CASENT0914065; Indo-Australian Region)..................................................... .................................................................................................................................................... D. borneensis Wheeler, W.M., 1916

Body red or yellowish brown; frontal triangle distinct (Fig. ANTWEB1008030) .............................................................................13

13. Head slightly longer than width; clypeus with delicate carinae, with anterior margin feebly emarginated in middle. Petiole much longer, more than twice length of width (Indonesia)........................................................................... D. karnyi Wheeler, W.M., 1924

Head wider than length; clypeus with a strong median and two lateral carinae, with anterior margin strongly emarginate in middle. Petiole comparatively short, less than twice length of width (ANTWEB1008030; Malaysia)............................................................... .................................................................................................................................................... D. yamanei Bharti & Kumar, 2013

14. Mesosoma, petiole and postpetiole black; gaster distinctly reddish brown ( Figs 7–9 ; China) .................................. D. rufida sp. nov.

Mesosoma, petiole and postpetiole yellowish to blackish red; gaster brown to black........................................................................ 15

15. Gaster paler, with yellow pilosity (Indonesia)............................................................................... D. sebesiana Wheeler, W.M., 1924

Gaster brown to black, with whitish pilosity...................................................................................................................................... 16

16. Petiole more than 2.5 times length of width; dorsal margin weakly convex (Figs ANTWEB1008026, ANTWEB1008029)............ 17

Petiole less than 2 times length of width; dorsal margin distinct convex (Figs ANTWEB1008025, ANTWEB1008027).................18

17. Clypeus with 5 strong carinae. Body dorsum with subdecumbent hairs (Fig. ANTWEB1008026; China) ........................................... ................................................................................................................................................... D.gaoyureni Bharti & Kumar, 2013

Clypeus with 3 strong carinae. Body dorsum with stiff erect hairs (Fig. ANTWEB1008029; Vietnam) ............................................... ...................................................................................................................................... D. propotriangulata Bharti & Kumar, 2013

18. Gaster smooth and shiny. Legs smooth, yellowish brown (Fig. CASENT0912885; China and Vietnam) ............................................. .................................................................................................................................................................. D. fouqueti Santschi, 1910

Gaster reticulate and opaque. Legs opaque with fine sculpture, blackish (Figs ANTWEB1008025, ANTWEB1008027) ................19

19. Posterior corners of head blunt and not forming a dent. Posterior 1/3 of head dorsum without reticulation (Fig. ANTWEB1008025; Vietnam)......................................................................................................................................... D. eguchii Bharti & Kumar, 2013

Posterolateral corners of head acute and forming a dent. Posterior 1/3 of head dorsum with reticulation. (Figs ANTWEB1008027 & CASENT0908984).............................................................................................................................................................................20

20. Head castaneous. Anterior lateral angles of pronotum acute. Dorsum of petiole slightly convex in profile. Petiole with a digitation (Figs ANTWEB1008027 & CASENT0908984; Indonesia)...................................................... D. selebensis simalurana Forel, 1915

Head blackish. Anterior lateral angles of pronotum blunt. Dorsum of petiole arcuate in profile. Petiole with a strong antero-ventral tooth (Fig. ANTWEB1008027; India)............................................................................. D. gasteroreticulata Bharti & Kumar, 2013

Figures

Figures 7−12. Dilobocondyla rufida sp. nov. 7−9. Worker. 10−12. Female. 7, 10. Head, full-face view. 8, 11. Body, dorsal view. 9, 12. Body, lateral view.