Eugubinus, Distant, 1903

Ghate, Hemant V., Boyane, Swapnil S. & Webb, Michael D., 2021, Description of the adult of the thread-legged assassin bug Eugubinus araneus (Hemiptera: Reduviidae) from India, with comments on other congeneric species, Zootaxa 4990 (2), pp. 291-304 : 293

Key to the species of Eugubinus (modified after Wygodzinsky, 1966)

1 Body length more than 20 mm; apterous; basal fourth of fore femur devoid of spines ( Fig. 28 ).............. E. canalanus

- Body length 17 mm or less; winged; spines of fore femur beginning almost at base of segment....................... 2

2 Body length 17 mm; fore femur dark, with one broad, subapical, white annulus removed from apex by its own length; pronotum dorsally with a pair of anteriorly converging whitish bands............................................. E. leleupi

- Body length less than 17 mm; colour not as above........................................................... 3

3 Body length 16 mm; colour piceous; fore coxae reddish; abdomen strongly enlarged apically............. E. strangulatus

- Body length less than 16 mm; body colour and shape of abdomen not as above.................................... 4

4 Head piceous with a posterior pale yellowish median line and a wide pale fascia laterally between eyes and base of antennae; fore femora dark, dorsally with two submedian whitish spots; third segment of rostrum whitish ( Figs. 29–31 )...................................................................................................... E. annulatus

- Colour not as above................................................................................... 5

5 Anterior and posterior lobe of pronotum equal or subequal in length............................................ 6

- Anterior lobe of pronotum distinctly shorter than posterior lobe................................................ 8

6 Head and pronotum fuscous with central pale longitudinal lines; apices of posterior femora black ( Fig. 25 : adult syntype; Fig. 26 : nymph)................................................................................. E. reticolus

- Head and pronotum uniformly piceous; apices of posterior femora whitish....................................... 7

7 Posterior femora with entire apical region greyish white ( Fig. 24 )..................................... E. intrudans

- Posterior femora with large subapical white annulus, extreme apex black ( Fig. 32 : holotype, mid and hind legs mutilated).............................................................................................. E. forsteri

8 Visible first and second segment of labium strongly incrassate and strongly bent between first and second segment ( Fig. 6 ); eyes large, touching ventral margin of head in lateral view ( Fig. 5 ).......................................... E. araneus

- Visible first and second segment of labium very slightly incrassate and not strongly bent; eyes not touching ventral margin of head in lateral view ( Fig. 27 ).................................................................. E. papuensis

Figures

FIGURES 26–28. Specimens of Eugubinus spp. and their labels. 26, topotypical nymph of E. reticolus Distant, 1915 (actual size about 12.0 mm); 27, holotype of E. papuensis Wygodzinsky, 1966 (actual size 15.2 mm); 28, syntype of E. canalanus (Distant, 1914) (actual size about 18 mm): the printed determination label is a BMNH collection label, not a specimen label.

FIGURES 29–32. Type specimens of Eugubinus spp. and their labels. 29–31, holotype of E. annulatus (Villiers, 1948): 29, lateral view habitus; 30, dorsal view of anterior half; 31, lateral view of head and prothorax. 32, holotype of E. forsteri Wygodzinsky, 1953: head and prothorax in lateral view.

FIGURES 23–25. Type specimens of Eugubinus spp. and their labels. 23, syntype (nymph) of E. araneus Distant, 1903 (body length 8.5 mm); 24, syntype male of E. intrudans Distant, 1915 (body length 13.0 mm); 25, syntype female of E. reticolus Distant, 1915 (actual size 13.0 mm).

FIGURES 5–8. Colouration of Eugubinus araneus Distant, 1903. 5, lateral habitus of male; 6, anterior half of body; 7, lateral habitus of nymph, 8, anterior half of nymph.