174 G. P. DEELEY ON THREE WATER-MITES NEW TO BRITAIN. 



hairs. The integument on the ventral side is covered with fine 

 circular markings. 



Only one specimen taken, a female. 



Locality. Himley Park, Staffs. 



The genus Thyopsis has not hitherto been recorded for Great 

 Britain. 



Sperchon glandulosus, Koen. 



In Science Gossip for January, 1900, Mr. C. D. Soar describes 

 two species of the genus Sperchon (Kramer). In May, 1903, 

 I took another species of the same genus, namely, Sperchon 

 glandulosus, not previously recorded for Great Britain. 



This mite is of a pale red colour with a deeper red spot in 

 centre of epimeral plates. The latter are in four groups, and 

 covered with fine green markings. The skin is covered on dorsal 

 and ventral surfaces w T ith a number of very conspicuous dermal 

 glands varying a little in size. In one specimen the number of 

 glands counted was sixteen on the dorsal side and twelve on the 

 ventral side. The rostrum extends some distance in front of 

 the first pair of epimeral plates. 



Length about l'O mm. Breadth 0*84 mm. 



Legs supplied with a number of short hairs, but no long 

 swimming hairs ; colour pale green. Claws to all feet. Palpi 

 about '33 mm. long. Second segment thick, and furnished with 

 a strong peg, close to which there is a stiff bristle. On the outer 

 edge are four stiff bristles. The last segment but one has two 

 fine hairs on the outer edge. Last segment has two small pegs 

 on inner edge, with three fine hairs at extremity. Genital area 

 composed of two plates ; on the inner edge of each are three 

 acetabula, the first two pairs being elongated, and the last pair 

 nearly circular. The mite is not a vigorous swimmer, preferring 



