TERRESTRIAL ACARI OF THE TYNE PROVINCE 38^ 



7. Dorsum without humeral projections 



Cepheits. 



Dorsum with humeral projections ... ... ... Tritegeus. 



S. Lamellae large pale upright ... . .. ... Tegeocranus. 



Lamella? dark horizontal, or ... ... ... ... 9 



9. Dorsum projecting far over the cephalothorax ... Tectocepheus. 



Dorsum not so projecting ... ... ... ... 10 



[O. Abdomen with a projecting lateral pore ... ... HermanicUa. 



No lateral pores ... ... ... ... ... ... 11 



[I. Dorsum elongate, with appressed setae... ... ... Odontecepheus. 



Dorsum broad (rather quadrate) setae erect ... ... Carabodzs. 



SERRARIUS, Mich. 



1. Serrarius microcephalus, Nic. 



Essex, Cornwall, Dorset (B.O.). 



LIACARUS, Mich. 

 The three British species at present known represent 

 three distinct groups which may be indicated as follows : — 

 Liacarus (type nitens Gerv.) — translamella represented 



by a forward-pointing mucro. 

 Adoristes (type ovatus K.) — no trace of translamella or 



mucro. 

 Astegistes (type bicomis P. & W.) — site of translamella 

 grooved. 



2. Liacarus coracinus, K. 



Leiosoma simile, Nic. (B.O.). 66, 67, 68. 



General in Britain. Xylophilous. 



3. Liacarus ovatus, K. 



Leiosoma ovatum, K. (B.O.). 66, 67, 68. 



General in Britain; much more frequent than the 

 preceding. Xylophilous. 



4. Liacarus bicor/iis, P. & W. (P. Z.S., 1905). 



Yorkshire and Cambridgeshire (P. & W.). Cumber- 

 land and Westmoreland (J. C. Varty-Smith.) 

 Scotland. 



PHYLLOTEGEUS, Berl. 



5. Phyllotegevs palmicinctus, Mich. 



Leiosoma palmicinctum (B.O.). 

 Cornwall (B.O.). Mycophilous. 



I 



