S72 MR. STANLEY HIRST ON 



c? . Male sexual orifice situated well forward on the cephalo- 

 thorax above the first pair of legs ; the minute lobes, etc., round 

 it are exactly as in specimens from cattle. Males are very rare 

 in the slides mounted from the material, and the measurements of 

 the male sex given below are based on very few examples. 



Measurements. $ . Total length 180-238 /.t ; length of cephalo- 

 thorax + capitulum 90-101 /x., of abdomen 90-143 /x ; greatest 

 width of cephalothoi-ax 58-65 p. (rarely 70), of abdomen 53-60/x.. 

 (S . Total length 1 99 ju ; length of cephalothorax + capitulum 

 79 /x, of abdomen 120 /a ; greatest width of cephalothorax 61 ^, 

 of abdomen 64 ^t. 



Host. Material from a deer (species ?) at Ohantilly, France 

 {^Dr. E. Brtbmpt). 



Dbmodbx melesinus Hirst, (Text-fig. 11 D & E.) 



The Bemodex of the badger is of unusual interest, for of all the 



known forms it most closely resembles that present in man [D. 



folliculorum), but is smaller in size and has the capitulum more 



elongated. 



Demodex canis var. erinacei Hirst. 



Since writing my paper on Demodex, I have obtained a number 

 of specimens of this variety from the head of a hedgehog caught 

 by the Museum taxidermist (Mr. A. H. Bishop) at Dymchurch, 

 Kent (3. viii. 1919). They are elongated specimens, agreeing 

 fairly well with those on which my description was based. These 

 additional examples measure as follows : — $ . 312-370 /x, (a large 

 bent example of this sex probably measures about 400 /x). 

 S. 232-292 /x. 



Family Trombidiid^. 



Tetranycopsis horrida C. & F. 



This " Red Spider " has not been recorded from England. I 

 have seen an example collected by Mr. K. G. Blair, on hazels at 

 Shoreham, Kent, and during an excursion to that locality I 

 obtained another specimen myself. The species, apparently, is 

 not very abundant, even where it occurs. ISTumerous specimens 

 of the lime-tree mite (Tetranychus tilim'ium) occurred on the 

 hazels in this locality. 



Genus Psorergates. 



In some details of structure, the immature stages of the mites 

 of the genus Psorergates resemble those of the genus Demodex. 

 For instance, the feet of the larval and nymphal stages are in- 

 complete, consisting of an epimeron, shaped almost exactly as in 

 Demodex, both its ends being angular and supporting a roughly 

 circular disc-shaped segment, bearing processes or claws fur- 

 nished with denticles of a similar type to those present in the 

 immature stages of Demodex. In spite of the diflerenee in shape 



