196 BRITISH TYEOGLYPHID^:. 



they would be known from them. No hypopial nymph 

 is known. 



Habitat. The known species, as before stated, are 

 fonnd on marine or brackish water algse. 



It is quite probable that if more species are discovered 

 it may be found that some of the above particulars are 

 rather specific than generic. 



There is only one known British species, L. algivo- 

 rans. The only other species, L. fusca, Lohmann, 

 from Heligoland and the North Sea, may be known 

 from L. algivorans (should it be found here) by its 

 larger size (length "53 mm.), darker and evener colour ; 

 by having the rostrum hidden by a hood-like projection 

 on the remainder of the cephalo thorax, by a small 

 chitinous plate on the anterior margin of the cephalo- 

 thorax, and by its palpus of only two free joints. 



LENTUNGULA ALGIVORANS,* Michael. Plate I. 



Lentungula algivorans, 1893, Michael. " On a New Genus and 

 Species of Acari found in Cornwall," 

 in 'P. Zool. Soc. London,' March 14th, 

 1893, pp. 262 267, pi. xviii. 



Length without mandible, about . 

 Greatest breadth, about . 

 Length of legs, first pair, about . 

 second pair, about 



third and fourth pairs, about 



38 mm. 

 20 

 13 

 14 

 15 



Colour. The actual colour of the creature, if it had 

 been fasting for a long time, would probably be almost 

 entirely light yellow, but as ordinarily seen it is dark 

 olive-brown with very numerous light yellowish spots 

 and markings. The yellowish colour is chiefly in 

 spots and spaces surrounded by the olive, but the 

 spots are not arranged in any definite pattern ; although 

 a few spots on the cephalothorax have a tendency to 

 be constant, yet the markings as a whole are most 

 irregular and varying. The olive-brown colour greatly 



* Algae, seaweeds, etc. ; voro, I devour. 



