Chelyolygus, Yasunaga, 2024

Key to species of Chelyolygus , new genus

1. Scutellum with a dark, broad, median stripe in whole length; posterior part of corium uniformly fuscous ( Fig. 1C, E View Fig ); Indonesia (Bali) ................................... C. cheroti , new species

– Scutellum pale, or with a triangular mark anteriorly ( Fig. 1E View Fig ) or with faint, brown, narrow, mesal stripe ( Fig. 1G View Fig ); posterior part of corium with noticeable pale portions .........................2

2. Basic colouration pale orange-brown ( Fig. 1I, J View Fig ); both pronotum and hemelytra almost glabrous, very shiny; basal half of cuneus fuscous; Taiwan (Pingtung) ...................................................... ............... C. bipuncticollis ( Poppius, 1915) , new combination

– Basic colouration pale brown, or milky- or ivory-brown; pronotum and/or hemelytra setose; base of cuneus always pale (median part of cuneus sometimes darkened)........................3

3. Apex of scutellum and inner margin of clavus (at least anterior half) infuscate..........................................................................4

– Entire scutellum and inner margin of clavus pale.................6

4. Base of antennomere II darkened; cuneus sometimes with a circular spot medially ( Fig. 7A, B View Fig ); Indochina ( Thailand and Vietnam) ...................................... C. wolskiorum , new species

– Base of antennomere II pale; cuneus entirely pale, sometimes with obscure inner margin ......................................................5

5. Male antennomere II dark brown, with pale basal ¼–¼ ( Fig. 4A, B View Fig ); female metafemur shorter than basal width of pronotum; Taiwan.... C. fuhoshoensis ( Poppius, 1915) , new combination

– Male antennomere II pale brown, with darkened apical ¼–⅓ ( Fig. 4F, G View Fig ); female metafemur equal in length to basal width of pronotum; Nepal (lowland) ........ C. parsanus , new species

6. Dorsum with clear striped pattern; base of antennomere II pale ( Fig. 6B, F View Fig ); corium and clavus with brown, narrow, continuous stripes along wing veins and fractures ( Fig. 6A, F View Fig ); Singapore.............................. C. virgulatellus , new species

– Dorsum widely whitish, without clear striped pattern; base of antennomere II darkened; corium and clavus with greyish brown, interrupted, fragmentary stripes ( Fig. 1A View Fig ); Bali .......... .................................................... C. tabananicus , new species