Key to species of the Schistostoma albopilosum group

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

– Female .................................................................................................................. 5

2 Hind tibia somewhat tapered toward apex, bearing 1 row of dorsal bristles on apical half with 3 or 4 subapicals long and strong. Mid tibia with dorsal subapical spinule-like setae, tuft of similar ventral setae before excision and ventral spinules at apex (Knersvlakte, Namaqualand) ........................................................... kalkgat sp. n.

– Hind tibia slender, with ordinary setation. Mid tibia with different armature ...... 3

3 Proboscis half as long as head height. Acrostichals biserial throughout. Mid tibia with some spinules beyond excision (Brandberg Massif) ...................................... ............................................................................................ brandbergensis sp. n.

– Proboscis as long as head height.Acrostichals 3- or 4-serial in middle part of scutum. Mid tibia with different armature beyond excision .............................................. 4

4 Style about twice as long as postpedicel. Mid tibia with 2 short flattened bristles beyond excision (Kamiesberg, Namaqualand) ...................... stuckenbergi Chvála

– Style about as long as postpedicel (usually somewhat longer). Mid tibia with 3 strong brownish bristles beyond excision (Mediterranean) .................................... ............................................................................................. albopilosum (Becker)

5 Acrostichals biserial ............................................................................................. 6

– Acrostichals 3- or 4-serial ..................................................................................... 7

6 Proboscis somewhat longer than head height .................................. kalkgat sp. n.

– Proboscis half as long as head is high ................................ brandbergensis sp. n.

7 Abdomen with black setation ................................................ stuckenbergi Chvála

– Abdomen with whitish setation ........................................... albopilosum (Becker)