HERMANNIA NANUS. 455 



the progaster, and running backward about half the 

 length of the abdomen, and the arms running outward 

 to the lateral margin. I cannot, however, say for 

 certain that this nymph is not a variety of that of H. 

 reticulata. 



Distribution. — This species, like H. histriata^ appears 

 to be amphibious. I found it at the Land's End, Corn- 

 wall, and my cousin, Mr. M. J. Michael, found it in 

 Gower, South Wales,bothof us in moss or lichen on land. 

 Mr. Bostock found it in Puffin Island, North Wales, on 

 fresh-water algae, where the water was trickling over 

 the rocks in company with Scutovertex corrugatus. 



Mr. Bostock and I also found a creature in consid- 

 erable numbers on the lichen growing in a sand-stone 

 cavern near Stone, in Staffordshire, which seems to 

 agree with this species in all respects except that the 

 abdomen is rather longer and is more oblong than 

 that of other specimens of H. nodosa, and the legs 

 seem shorter in proportion ; this may possibly turn 

 out to be a distinct species, but at present, not being 

 acquainted with their life-histories, I think it best to 

 treat it as a variety. I am not aware of the species 

 being hitherto recorded. 



Heemannia nanus* {Nic). PI. XLIII, figs. 1 — 7. 



Nothrus nanus, Nic. P. 458, pi. vii, fig. 5. 



Hermannia nana, Berlese. Acari, &c., Ital. Notes, fasc. iii. 



Average length about '51 mm. 

 Average breadth about "26 mm. 

 Average length of legs (first and third pairs) about 

 •28 mm. 



Average length of legs (second pair) about '20 mm. 

 Average length of legs (fourth pair) about "27 mm. 



* Nanus, a dwarf. As this is a noun it would appear to be correct 

 not to make tbe gender agree with that of the genus, although there is 

 some authority for the use of the word as an adjective. 



