Key to Charissa (Pterygnophos) species: female genitalia structures

(Abbreviations in brackets refer to Fig. 1b)

The structure of the female genitalia is not basically different from some species of Charissa, subgenus Dysgnophos Wehrli, 1951 . Occasionally, it can be difficult to judge whether a specimen under examination is a female of Pterygnophos or of Dysgnophos . For this reason, using the provided key assumes that the female in question actually belongs to Pterygnophos.

1 Postvaginal plate (pvp) posteriorly almost not extending the antrum......................... C. (P.) beljaevi spec. nov.

- Postvaginal plate strongly extending the antrum............................................................ 2

2 Antrum comparatively short (1.57–1.83 mm) and broadly funnel-shaped (antrum width: 0.87–1.00 mm)... C. (P.) creperaria

- Antrum longer (1.77–2.91 mm) and slender (antrum width: <0.82 mm)......................................... 3

3 Antrum length> 2.2 mm and length of spined longitudinal folding (slf)> 1.3 mm ..................... C. (P.) agnitaria

- Antrum length 1.8–2.3 mm and length of spined longitudinal folding (slf) 1.1–1.3 mm ................................................................................................... C. (P.) agnitaria or C. (P.) ochrofasciata Shape and measured values of genitalia structures are too similar and widely overlapping, making a diagnosis ambiguous. Fur- ther information, for example origin of the specimen, should be taken into account and, if possible, comparative material should be used.