British Orihatidx. By A. I). Michael. 249 



median line they expand into rounded lumps, which are the most 

 raised, and then become narrower and turn back to meet the lateral 

 expansions : between the two lumps and opposite the termination 

 of the first-named ridges is a narrow depression, not quite down to 

 the level of the cephalothorax ; this communicates with a deep and 

 wide depressed channel between cephalothorax and abdomen : from 

 near the ends of this channel proceeds a smaller one which runs 

 round the abdomen. There is a raised, rough, exterior margin, 

 which is prolonged into small angular corners ; within this channel 

 the abdomen is almost circular, and much raised and marked like 

 morocco leather, whence doubtless Koch's name. Stigmata large, 

 raised, and pointed outward, stigmatic hairs curved forward and 

 thickened towards the ends; two rows of about four rather 

 spatulate white hairs on the back, and some shorter, projecting 

 from posterior margin. First pair of legs inserted in a deej) cleft 

 of cephalothorax, which is open above and below ; second pair 

 supported by a projecting plate. All trochanters, but particularly 

 first pair, very thin where inserted, and greatly and suddenly 

 thickened towards the middle. 



Lives chiefly in fungi growing on old trees. 



38. Tegeocranus labyrinthicus. Mihi, PL XL Fig. 2. 



Average length about * 45 mm. 

 „ breadth „ '25 mm. 



New Sjyecies. 



Found by Mr. George at Kirton Lindsey, and by me at Epping 

 Forest and near Tamworth. 



A small species, of a deep red brown colour, the whole creature 

 covered with raised dots, close together and often coalescing, 

 arranged in winding lines leaving narrow depressions between. 



Cephalothorax triangular, broad, and joined by its whole width 

 to the abdomen. Along whole length of cephalothorax runs a broad, 

 free, raised, reticulated expansion, about equal in width until near 

 its anterior point, but having a semilunar depression in the margin 

 near where it joins the abdomen. Stigmatic hairs with thin stalks 

 and piriform, clubbed ends. First and second pairs of legs set in 

 shallow clefts of cephalothorax; all trochanters enlarged beyond 

 the middle. The abdomen has the sides almost parallel, hind 

 margin rounded, anterior ditto truncated and only slightly curved. 

 The border usually found round the abdomen in this genus is 

 wanting or rudimentary, but the anterior angles are expanded 

 adjoining the cephalothorax. A row of short, straight hau's round 

 the hind margin. 



I believe this species to be unrecorded, and propose to call it 

 labyrinthicus, from the maze-like arrangement of the rows of dots 

 on the back. 



