Dr. Johnston on the Acarides of Berwickshire. 115 



remarkable for their hookedness and the large sheath at their 

 base. The eyes appear to be supported on a very 8hoi*t pedicle ; 

 and there is a pair on the summit of each pedicle. 



The specimen from which this description is made was taken 

 during the walk of the Club, May 1, 1850, near Twizel Castle. 

 The mite is not a characteristic Rhi/ncholophus, but stands, as it 

 were, between that genus and Trombidium. Of those species 

 figured by Hermann, it approaches very near to Trombidium 

 quisquiliarum ; but I am afraid to identify it with that species, 

 because, in the figure, the thoracic portion of the body is not 

 represented as separated from the abdominal, but continuous with 

 it ; and the tarsal joint of all the legs is figured as being ellip- 

 tical and enlarged, and much shorter than the penultimate, 

 which is a state of parts far otherwise in our insect. 



29. Bryobia haustor. 



Rhi/ncholophus ? haustor, Hardy in Ann. and Mag. Nat. Hist. 



Ser. 2. vi. 187. 

 R. atro-sanffuineus fronti vittd dorsali pedibusque coccineis, cor- 



pore nudo,pedibus anticis gracilibus extensis posterioribus duplo 



lon^ioribus. 



Desc, Mite small, of a dusky brownish-red colour with a scarlet 

 vitta along the centre of the back, and scarlet front and legs. 

 Body ovate, rather depressed, triangulate in front and broadest 

 at the shoulders, rounded and entire behind, roughish but naked ; 

 the venter coloured like the back, with a large scarlet spot round 

 the anal pore, rather convex; the posterior half beautifully marked 

 with undulated cutaneous plaits when subjected to pressure. 

 Thorax scarlet, separate by a raised line from the abdomen. 

 Eyes sessile, forming a round dark spot on each shoulder, and 

 almost marginal. Palpi short, very thick at the base, conoid 

 and tapered, armed with a stout claw, and under the claw there 

 is a small oblong setigerous appendage scarcely larger than the 

 claw itself. Legs eight, gracile, filiform ; the anterior longer 

 than the body, porrect and slender ; the fourth and second pairs 

 half as long, and the third pair shortest, all a little stouter than 

 the first ; first pair with the first joint short and bulged ; second 

 equally short but smaller ; third greatly elongated ; fourth about 

 half as long; fifth considerably longer than the fourth, and 

 thickened outwards; sixth about the length of the fourth, a 

 shade thicker than the penultimate and more setose, cyhndric, 

 oblique at the end, and armed with two pedunculated curved 

 claws, provided with short bristles on their inferior aspect. 

 Bristles of the legs' basal joints distant, short, thick and roughish, 

 but those of the distal joints (particularly of the tarsal joint) are 

 longer, simple and sharp. The joints of the other legs are pro- 



