Characters;Photinopygus;Xanthopygus
"4. Antennae, antennomere 5";"(0) elongate (Figs 1A, F).";"(1) subquadrate (Figs 1D–E)."
"8. Head, width in comparison to pronotum";"(1) subequal (Figs 1A–C).";"(2) wider1 (Figs 1D–E) (apomorphy)."
"9. Head, shape, posterior margin";"(0) slightly extended posteriad on each side of the neck2 (Figs 1A–C) (apomorphy).";"(1) more or less at same level with neck border (Figs 1D–E)."
"10. Head, eye size relative to length of head";"(1) medium (between 2/5 and 2/3 length of head) (Fig. 1B).";"(0) small (less than 2/5 length of head) (Fig. 1D) (apomorphy)."
"15. Mandible, left, teeth structure";"(2) one bicuspid tooth (Fig. 1C).";"(1) two teeth, separated by deep emargination (Fig. 1D) (apomorphy)."
"17. Pronotum, microsculpture";"(3) with sparse micropunctures (but no transverse lines visible at 70× magnification) (apomorphy).";"(1) with transverse lines (seen easily at 70× magnification)3."
"22. Prothorax, hypomeron, angles of superior and inferior marginal lines";"(0) superior and inferior line produce anterolateral angles parallel to one other (Fig. 2A).";"(1) superior and inferior line produce anterolateral angles not parallel to one other (Fig. 2B) (apomorphy)."
"28. Mesothorax, mesoscutellum, dense micropunctures";"(0) absent (Fig. 2D) (apomorphy).";"(1) present (Fig. 2C)."
"29. Mesoventrite, intercoxal process, apex";"(2) narrow and rounded (Fig. 2E) (apomorphy).";"(1) broad and rounded; or (3) broad and pointed (Fig. 2F)."
"30. Metathorax, metepisternum, punctures";"(1) metepisternum covered with punctures or impunctate area less than 1/34 (Fig. 3B).";"(0) dorsal 1/3 of metepisterstum without punctures throughout its length (Fig. 3A) (apomorphy)."
"32. Metathorax, metacoxae, spines on the posterior surface";"(0) 4 or less (Fig. 3C).";"(1) more than 45 (Fig. 3D)."
"34. Metathorax, metatarsi, tarsomere 3, dorsal surface, chaetotaxy";"(1) tarsomeres dorsally setose (setae not restricted to marginal series) (Fig. 3F) (apomorphy).";"(0) developed only at margins, dorsal surface of tarsomeres glabrous (or with 1–2 setae) along midline (Fig. 3E)."