Key to female Physokermes species found in the western Palaearctic Region.

1. Multilocular disc pores scattered on mid-venter but not forming transverse bands or rows; multilocular disc pores present in a large group on dorsum of each anal lobe...................................... P. hellenicus Kozár & Gounari, sp. n.

- Multilocular disc pores on mid-venter forming transverse bands or rows; multilocular disc pores absent from dorsum of each anal lobe........................................................................................... 2

2. Posterior spiracles with fewer than 10 multilocular pores in each posterior spiracular furrow; multilocular disc pores forming a longitudinal mediolateral band on abdomen and thorax................................... P. hemicryphus (Dalman)

- Posterior spiracles with 20 or more multilocular disc pores in a row or band in each posterior spiracular furrow; multilocular disc pores not forming longitudinal mediolateral band on abdomen and thorax..................................... 3

3. Posterior spiracles with 20–25 multilocular disc pore in a row in each posterior spiracular furrow; multilocular disc pores present mid-ventrally on posterior 5 abdominal segments; hair-like setae forming a band on each anal lobe............................................................................................. P. inopinatus Danzig and Kozár

- Posterior spiracles with 30 or more multilocular disc pores in a band in each posterior spiracular furrow; multilocular disc pores present mid-ventrally on last 7 abdominal segments; hair-like setae in a small group on each anal lobes................................................................................................... P. piceae (Schrank)