3 



(dr. a. C. OUDEMANS). notes on ACATII VI. 



5. Key to the species of Thrombidium F. 



Larvae. 



^ Two dorsal shields .... Thr. holosericeum (L.) 



( One dorsal shield 2 



Dors, shield, subquadrangular . 3 

 Dors, shield triangular . . . Thr, novum Oudms. 

 \ On each side one eye . . . Thr. russicum Oudms. 

 ' On each side two eyes ... 4 

 fPsdst. org. filiform .... Thr. gymnopterorum (L.) 

 4. \ Psdst. org. davate (Berl.Tromb. 



Tab. XVI.) Thr. berlesei Oudms. 



6. Tarsonemus soricicola Oudms., nov. sp. 

 (With Plate 1, fig. 20 and 21). 



Of this species only the male is known to me. 



I found it among other parasites collected in Febr. d 898 by 

 Mr. S. A. Poppe on a Sorex vulgaris at Vegesack. 



As to the male (Fig, 20 and 21), Tarsonemus soricicola is close]^ 

 related to T.jloricola G. et F. and T. hrevipes Sicher et Leonardi. 

 Length 150 ^. 



The following characteristics may be mentioned. 



The shape of the body is elongate, like that of T. hrevipes. The 

 abdomen , however , is widest posteriosly , behind the implantations 

 of the hind-legs , whilst the known species are widest before these 

 legs, nay even quite behind the shoulders. The fore-legs are short 

 and slender, and their tibiae bear quite distally a short thick, 

 davate olfactoric hair. The epimera of legs 1 form an Y. Those 

 of legs 2 first bend inward and then obliquely backward and 

 inward ; they do not reach each other and do not meet the Y. The 

 hind-legs are implanted far more forward than in any known 

 species, so that the abdomen projects a good deal above them. 

 The epimera of legs 3 and 4 join anteriorly. The legs 3 are long 

 and slender, but their ambulacra do not extend beyond the claw 



