Ceratostigma Li, 2002

Jie, Lulan, Liang, Feiyang & Liu, Xingyue, 2022, Revision of the bark louse genus Ceratostigma Li, 2002 (Psocodea: Psocidae: Psocinae) with description of a new species from China, Zootaxa 5168 (2), pp. 196-206 : 197

Ceratostigma Li, 2002

Ceratostigma Li, 2002: 1595 .

Type species: Ceratostigma gracilis Li, 2002: 1595 , by original designation.

Diagnosis. Forewing with veins on basal two-thirds yellowish or grayish white; Sc usually ending free; Rs and M meeting in a point or fused for a short distance; CuA 1-2 and M+CuA 1 nearly in a line. Male genitalia: Hypandrium of asymmetrical, simple plate, medially with a ridge. Female genitalia: Epiproct subtriangular. Paraproct subtriangular. Subgenital plate with a short and distally rounded egg guide; pigmented area slightly sclerotized, roughly T-shaped, stem of T-shaped marking more than two times as long as basal width. Dorsal valve of gonapophyses broad, pointed at tip, inner margin with a strongly sclerotized area at base; external valve with a triangular posterior lobe.

Distribution. China, Indonesia.

Key to species of Ceratostigma

1 Male ............................................................................................... 2

- Female............................................................................................. 5

2 Radial fork with branches diverging at an angle less than 90°................................................... 3

- Radial fork with branches diverging at an angle more than 90° ( Fig. 23 ).................... Ceratostigma stagona sp. n.

3 Radial fork with branches diverging at an angle of about 60°; epiproct distally pointed.............................. 4

- Radial fork with branches diverging at an angle of about 30°; epiproct distally rounded (New et al. 2002: figs 124, 128).................................................................... Ceratostigma lisae ( Thornton, 1984) comb. n.

4 Hypandrium distally narrowed ( Figs 20–21 )........................ Ceratostigma macrostigmatum ( Li & Yang, 1987)

- Hypandrium distally not narrowed ( Figs 5–6 )....................................... Ceratostigma gracilis Li, 2002

5 Cells r3 and r5 almost hyaline; radial fork with branches diverging at an angle less than 90° ( Thornton 1984: fig. 154)..................................................................... Ceratostigma lisae ( Thornton, 1984) comb. n.

- Cells r3 and r5 brown; radial fork with branches diverging at an angle of about 90°................................. 6

6 Basal one-fifth of the forewings with a slightly curved grayish white stripe; pigmented area in egg guide flatted at tip ( Figs 8, 14–15 )...................................................................... Ceratostigma gracilis Li, 2002

- Basal one-fifth of the forewings with a V-shaped grayish white marking; pigmented area in egg guide pointed at tip ( Figs 34 , 43–44 )........................................................................ Ceratostigma stagona sp. n.

Figures

FIGURES 23–27. Ceratostigma stagona sp. n., paratype male. 23. Forewing; 24. Hindwing; 25. Head, frontal view; 26. Habitus, lateral view; 27. Habitus, dorsal view.

FIGURES 16–22. Ceratostigma macrostigmatum (Li & Yang, 1987), holotype male. 16. Forewing; 17. Hindwing; 18–19. Epiproct and paraproct, dorsal view; 20–21. Hypandrium; 22. Phallosome. ep: epiproct; pp: paraproct.

FIGURES 1–7. Ceratostigma gracile Li, 2002, holotype male. 1. Forewing; 2. Hindwing; 3. Genitalia, dorsal view; 4. Epiproct and paraproct, dorsal view; 5–6. Hypandrium; 7. Phallosome. ep: epiproct; pp: paraproct.

FIGURES 8–15. Ceratostigma gracile Li, 2002, paratype female. 8. Forewing; 9. Hindwing; 10–11. Epiproct and paraproct, dorsal view; 12–13. Gonapophyses, ventral view; 14–15. Subgenital plate, ventral view. ep: epiproct; pp: paraproct; vv: ventral valve; dv: dorsal valve; ev: external valve.

FIGURES 34–38. Ceratostigma stagona sp. n., holotype female. 34. Forewing; 35. Hindwing; 36. Head, frontal view; 37. Habitus, lateral view; 38. Habitus, dorsal view.

FIGURES 39–44. Ceratostigma stagona sp. n., holotype female. 39. Genitalia, dorsal view; 40. Epiproct and paraproct, dorsal view; 41. Genitalia, lateral view; 42. Gonapophyses, ventral view; 43–44. Subgenital plate, ventral view. ep: epiproct; pp: paraproct; vv: ventral valve; dv: dorsal valve; ev: external valve.