274 MR. A. D. MICHAEL ON SOME TJNDE SCRIBED 



cases of Tyroglyphus longior and TyroglypJius (Trichodactylus) 

 anonymus *. In these cases also the duct between the bursa 

 and the receptaculum is extremely short, indeed scarcely marked. 

 In the present species, which belongs to a different genus, the 

 duct is long and slender, as will be seen from PL XXXIV. fig. 14 d, 

 which is drawn from an actual dissection, not from sections ; the 

 duct may however be clearly seen in the living creature when 

 one has become acquainted with its position by dissection. 



The construction of the articulation of the tarsal joint of the 

 two hind pairs of legs of the male in both species is worthy of 

 notice ; it is evidently of use in giving great play to the joint 

 for clasping purposes ; it will be found in the descriptions of O^, 

 platygaster, and in fig. 9, PL XXXIV., and figs. 15, 16, PL XXXV. 

 Lastly, a curious little matter is the existence of a singular hair 

 (PL XXXIV. fig. 12), not above yoW inch long, on the side of the 

 body of the male, between the coxae of the first and second legs ; 

 this minute hair is so branched as to resemble a tuft of fine Alg^; 

 its size and position prevent it from being seen on the whole 

 creature ; I only discovered it on dissections of the exoskeleton. 

 I am not sure whether it exists in the female. A somewhat 

 similar hair, similarly placed, was discovered by Dr. Kramer on 

 Glyciphagus ornatns'f. Dr. Kramer says that the hair in his 

 species stood before a minute opening ; I did not see an opening 

 in the present species, but it may exist. 



It remains to be considered what is the connection between 

 these G-lyciphagi and the Mole, and this is far from an easy pro- 

 blem to solve. I have now been in the habit of examining fresh 

 Moles for some years, whenever I could get them, and have exa- 

 mined a large number. I caught twelve Moles this Christmas, 

 in the same fields from which I dug up the nests as above men- 

 tioned, and at the same time ; and yet I have never seen a sign of 

 one of these Glyciphagi in any stage upon a Mole. 



On the other hand, in all my searches for Acari in moss, 

 grass, and leaves, extending over many years, and continued at 

 the time and place of obtaining the above Moles' nests, I have 

 never seen a specimen of either of the present species ; nor 

 were there any in those nests, which from external appearances 

 I had supposed to be old and abandoned. This subject is one 



* " Die Anatomie der Tyrogiyphen." Sitzgsber. der t. Akad. der Wissenscb. 

 Wien, sc. Bd. 1 Abth. p. 197 (1884) ; ibid. xcii. Ed. 1 Abth. p. 116 (1885). 

 t "Ueber Milben."' Zeitschr. fiir die gesammten Naturw., lir. Ed. (1881). 



