32 CHARLES D. SOAR ON 



Found at Cartron mountains in a bog pool by S. W. Kemp, 

 Tecorded by Halbert ; and near Lydford, Devon, in a bog pool 

 by G. T. Harris. 



The figures bave all been drawn from specimens sent by G. T. 

 Harris, from Dartmoor. 



Description of Figures, Plate 1. 

 Fig. 1. Ventral surface of ?. 



2. Lateral view showing height (diagrammatic), 



3. Distal end of 1st epimeron. 



4. Palp of ?. 



5. Genital area, ?. 



6. Genital area, c?. 



7. One of the acetabula shown in outline. 



8. Provisional genital area (nymph). 

 9-12. The four legs from one side of female showing arrange- 

 ment of spines and swimming hairs. 



,, 13. Ventral surface (nymph). 



Oxus ovalis (Miill.) Koenike. 

 PL 1, figs. 14-15. 



1776. Hydrachna ovalis Miiller. Zool. Dan. Prodr., page 190, 



no. 2264. 

 1781. Hydrachna ovalis Miiller. Hydrach,, page 53, pi. 10,. 



figs. 3-4. 

 1898. Oxus ovalis Koenike. Zool. Anz., vol. xxi. page 71. 

 1899-1900. Oxus strigatus Soar. Sci. Gossip, N.S., vol. vi. 



page 177, figs. 1-3. 



Female. — This mite is smaller than the preceding species, 

 Ibeing about 1-0 mm. long, and about 0-55 mm. broad. Similar 

 in shape to 0. plantaris, a long oval less in width in front than 

 at the posterior end. Colour a reddish yellow with dark -brown 

 markings on dorsal surface. Epimera and appendages a slaty 

 blue. 



The epimera are carried much farther towards the posterior 

 margin on the ventral surface than is the case in 0. plantaris. 

 The epimeral plate is about 0-70 mm. long. The genital area is 

 about 0-18 mm. long, with the acetabula rounded at each end. 



