132 (UR. A. e. ÜTJDEMANS). NOTES ON ACARI. 



to both ends, largest in the middle, and with slight sinuation 

 laterally before the hindmost rounded portion. It is provided with 

 lour longitudinal rows of small hairs, two marginal and two 

 broken median ones. Quite posteriorly two longer hairs. The sides 

 of the body are very sinuous. 



Ventral side (Fig. 18). Here we have a nearly triangular ster- 

 nal shield, laterally with shai'p angles between the coxae 1 and 

 2 , with deep posterior rounded excavations to receive the lower 

 genital lip, and with 6 hairs. The genital shield is long and nar- 

 row, longitudinally scaly and gradually passing anteriorly into the 

 striated portion. Anal shield oval, large. Many small hairs around 

 the ventral portion of the genital shield and around the anal one. Perl- 

 trema long, reaching before the coxae 1. Remarkable is, that the 

 peritrema reaches the dorsal side above coxae 1 , 2 and 3 (see 

 fig. 17). 



Epistoma , hyposfoma and palps like in the S. 



Mandibles (Fig. 19) chelate, the movable finger with a hook 

 distally, which is outside provided with two smaller hooks and a 

 little knot. 



Lejs. Compared with the male, the legs ai'e longer, esp. 1 

 and 4. 



Habitat'. Mus rattus , Vespertilio mur'tnus. 



Patria: Netherlands, Russia. 



13. Key the species of Liponyssus. 



NympJis. 



I With 8 intermediate shields L. lepidopeltis (Klti.) 



1. With 6 ditto 2 



' Wih 4 ditto 3 



t) \ Legs slender, esp. 1 and 4. L. rhinolophi Oudms. 



• Legs thick, esp. 1 and 2 . L, ciielophorus Oudms. 



iPost. dors, shield with 6 



bristles L. musculi (C. L. Koch). 



Post. dors, shield with 2 



bristles 4 



