TERRESTRIAL ACARI OF THE TYNE PROVINCE 29 



42. Achorolophus falconerii, sp. nov. 



Of the size, form, and colour of A. norvegt'cus, but 

 distinguished from that and from the rest of the 

 genus by the form of the dorsal trichomes which 

 are short, thick, serrulate, and thinly scattered over 

 the dorsum. (Fig. 49, 52.) 



Yorkshire (W. Falconer), a single specimen. 



C. — Sub-family Erythraeinae. 



Mandibles external, hooked. Epimera contiguous. No 

 post-thoracic furrow ; no crista. Dorsal few, scattered. 



1. All the tarsi many -jointed ... ... ... Tar solar ais. 



Tarsi undivided (except, rarely, tarsus ii) ... 2 



2. Apical joint of palp terminal on the penult ... Anystis. 



,, ,, lateral on the preceding ... Erythrceiis. 



ANYSTIS, Heyden. 



Palp of 4 articles, the last on the apex of the pre- 

 ceding. Tarsi undivided. 



Type : baccarum, L. 



43. Anystis baccarum, L. 66, 67, 68. 



Ubiquitous. The " money-spinner." 

 ERYTHR/EUS, Latr. 



Palp of 5 articles, the last appendiculate — i.e., seated 

 laterally on the base of the preceding. Tarsus ii 

 occasionally of several segments. 



Type : parietinus, Herm. (Type fixed by Heyden, 

 1828). 



44. Erythraeus parietinus, Herm. 66. 



On school walls, Chester-le-Street. 



TARSOLARCUS, S. Thor, 1912. 



Palp appendiculate. All the tarsi of several seg- 

 ments j ambulacrum with two strongly pectinate 

 claws and a pulvillum. 



Type : articulosus, S. Th. 



