Xylocoris, Dufour, 1831

Yamada, Kazutaka, Yasunaga, Tomohide, Artchawakom, Taksin & Sers, 2013, The genus Xylocoris found from plant debris in Thailand, with description of a new species of the subgenus Arrostelus (Hemiptera: Heteroptera: Anthocoridae), Acta Entomologica Musei Nationalis Pragae 53 (2), pp. 493-504 : 503

Key to species of Xylocoris occurring in the Oriental Region

The present key is modified from those provided by YAMADA et al. (2006: 532).

1. Male tibial teeth always absent; ostiolar peritreme smooth, lacking canaliculi; ectospermalege absent. Wing dimorphism present. (Subgen. Arrostelus ) .................................. 2

– Male tibial teeth always present on fore and middle legs; ostiolar peritreme densely covered with canaliculi; ectospermalege always present on right side of anterodorsal area of abdomen. Wing dimorphism absent. (Subgen. Proxylocoris ) ................................... 3

2. Clavus, endocorium, and embolium yellowish-brown; all femora uniformly pale yellow. .................................................................................. X. (A.) flavipes (Reuter, 1875)

– Clavus widely darkened along inner margin and claval commissure; endocorium narrowly darkened along corium-membrane boundary; embolium widely darkened along outer margin; all femora uniformly black to blackish-brown. .................................................... .................................................................... X. (A.) ampoli Yamada & Yasunaga sp. nov.

3. Corium darkened along corium-membrane boundary, and with dark sub-triangular spot at apico-mesial corium; ectospermalege much smaller, extending posteriorly. ................ ....................................................................... X. (P.) cerealis Yamada & Yasunaga, 2006

– Corium narrowly darkened along corium-membrane boundary, without dark subtriangular spot; ectospermalege large, broadened anteriorly. ......................................................... 4

4. Body larger (about 3.0 mm long); apex of paramere extending well beyond the tip of laterally produced left side of pygophore; ectospermalege vague, conical. ...................... ........................................................................................... X. (P.) clarus (Distant, 1910)

– Body smaller (about 2.3 mm long); apex of paramere extending near the tip of laterally produced left side of pygophore; ectospermalege with a complexly folded thin duct on right lateral margin. ............................ X. (P.) hyalinipennis Yamada & Yasunaga, 2006