24 



those of the male ; coxa 2 with two spurs, one forward and one 

 backward; coxa 3 with two spurs, turned backward. Mandibles 

 chelate, without teeth ; movable finger as long as the iinmovable 

 one, provided ventrally with a transparent membrane which projects 

 beyond the finger's top, and gives to the finger the shape of a 

 rasor (Fig. 25). 



Habitat: Talpa europaea, Vespertilio serotinus, Vespertilio dasy- 

 cneme, Vespertilio murinus, Vesperugo noctula, Mus musculus, Mus 

 rattus, Paludicola ampliibius, Putorius erminea. 



Patria: Germany, Italy, Netherlands, Russia. 



4. Liponyssus albato-affinis Oudras., nov. sp. 



With Plate II, fig. 26-31. 



Nymph (Fig. 26 and 27). — Length from 360—460 (a. — 

 The differences between this nymph and that of L. albatus (O. L. 

 Koch) lie in the absence of tubercles on the femur 1, the wider 

 dorsal shield, the arrangement of the minute hairs on it, which 

 is more of the usual type, the smaller number of hairs between 

 the sternal and anal shields, the absence of a posterior thorn on 

 coxa 2, and the absence of posterior thorns on coxa 3. 



Male (Fig. 28 and 29). — Length about 430 p. — It differs 

 from that of L. albatus (C. L. Koch), in the epistoma, which ends 

 in three points or cusps, and which is laterally bent downward, 

 so as to enclose the mandibles — indeed a curious feature. — 

 Further the hairs on the dorsal shield are minute; there is a 

 distinct praesternal shield ; the ventral part of the sterni-geniti- 

 ventri-anal shield is distinct and almost circular. The coxa 2 bears 

 only one spine or thorn directed forward, and the coxa '6 only 

 two spines, directed backward. 



Female (Fig. 30 and 31). Length about 465 p. The dorsal 

 shield is not so wide as that of L. albatus (C. L. Koch), and has 

 almost parallel lateral margins. Fosteriorly its edges are sinuated 

 a little inward, leaving at the right and at the left a part of the 

 dorsum unprotected. The hairs are smaller than in the related 



