364? DR. JOHNSTON ON THE ACARIDES OF BERWICKSHIRE. 



and shouldered in front, rounded behind, the sides sinuated 

 at the shoulders and more widely in the middle, the back un- 

 even with a longitudinal furrow (distinguished by its darker 

 hue) on each side, beginning behind the eye and extended 

 beyond the insertions of the posterior legs terminating in a 

 deeper fovea, and with a foveola near the centre and two 

 others situated far backwards : Vente?' plane, of the colour of 

 the back with a paler patch towards the anus : ^y^5 distinct, 

 glistening, reddish-brown, placed on each side of the vertex 

 in a line with the shoulders, sessile : Rostrum triangular, 

 armed with some simple sharp bristles on the sides below the 

 apex which is truncate, and furnished Avith a very long ex- 

 trusile sharp-pointed stylette: Falpi very obvious, clothed 

 with hirsuties like the legs, 4-jointed, the first minute, the 

 second large and elliptical, the third much slenderer and of 

 about equal length, the ultimate small, ovate-acute with a 

 single claw and an elliptical appendage underneath : Legs 8, 

 homologous, filiform, densely clothed with appressed short 

 rough sjunes, the 1st pair as long or nearly as long as the 

 4th and as long as the body, the 2d shortest, and the third 

 only a little longer, all of about the same thickness and 7- 

 jointed ; 1st and 2d joints small, 8d and 4th twice the length 

 of the second and equal, 5th and 6th rather longer and also 

 nearly equal, 7th equal to the 6th in length, elliptic-oblong, 

 obtuse, armed with two small claws almost hidden in the hir- 

 suties ; this joint is as it were enlarged and heavy, and is 

 covered with a thicker and denser hirsuties, and is shortly- 

 ovate and truncate in the second and third legs : Bristles of 

 the back short, thick, elliptical, and barbed with minute spi- 

 nules ; those of the limbs only differ in being somewhat more 

 acutely pointed, and some at the articulations are longer than 

 the rest. 



I have made this description from a specimen sent to me 

 by Mr. James Hardy, Dec. 15th, 1848. It is nearly of the 

 size of Trombidium holosericeum, but not distinctly divided 

 into two portions by any transverse fold. The eyes appear to 

 be sessile and resemble those of a spider. There are two 

 ocelli in each group. The stylette with which the mouth is 

 armed reminds one of the tongue of the humble bee, and con- 

 sists of two pieces which have a motion independent of each 

 other. When protruded together they form an instrument 

 well fitted to pierce the bodies of other insects. The bristles 

 are not nearly so evidently barbed as those of Trombidium 

 liolosericeum, and indeed it is difficult to discover that they 



