14 RRV. J. E. HULL ON 



P. 393. Oribates nervosus, Berl. Has occurred with 

 Formica rufa at Riding Mill and Chopwell (66b, 67b). 



P. 400. In line 5 of the dichotomous table delete " acute." 



P. 408. Hoplodermastricula, K. Has occurred plentifully 

 under stones in West Allendale (67a). 



On page 409, fifth line from the end, read '' spiculate head." 



II.— THROMBI Dl I D/E. 



In extending the local list so as to include all species on 

 record for the British Isles I have had to rely chiefly on the 

 published papers of Dr. C. F. George (Naturalist /«^^/>«) and 

 the Irish list of Mr. J. N. Halbert (Clare Island Survey). I 

 am indebted to Dr. George and the authorities of the Hull 

 Municipal Museum for the privilege of examining Dr. George's 

 mounted specimens — 41 slides in all, including 21 British 

 species. The Irish list enumerates 31. A few other odd 

 records gave me a nucleus of 46 species in all, and I have 

 been able to increase the total to 87. I owe very much to the 

 ample supplies of material which I have received from 

 Dr. Randell Jackson, Mr. R. S. Bagnall, Dr. J. W. H. 

 Harrison, Mr. W. Falconer, Mr. W. P. Winter, Mr. J. C. Varty- 

 Smith, and others. I have also to thank Mr. Wm. Evans for 

 a MS. list of Scotch species. 



What I have said concerning classification, nomenclature, 

 and arrangement in my previous paper on the Oribatidse is 

 equally applicable here and need not be repeated. 



By Dr. Berlese and others the Family is divided into two 

 sections according as the larvae and adults are similar 

 (homomorphous genera) or dissimilar (heteromorphous). The 

 distinction appears to be quite good though based on facts 

 imperfectly known and useless for purposes of identification. 

 The heteromorphous group includes the first two sub-families 

 ' — Thrombidiince and Rhyncholophince — distinguished by the 

 presence of a continuous pubescence on body and legs, and 

 a chitinous crista (median, longitudinal, and usually more or 

 less linear) bearing one or two pairs of sensilli. 



