294 DR. JOHNSTON ON THE ACAKIDES OF BERWICKSHIRE. 



Borders. Hence I have advisedly omitted all references to 

 foreign authors in relation to our Leptus phalangii, which 

 there can be scarce a doubt, from the structure of its bristles, 

 is the larva of the true Trombidium holosericeum. 



9. ERYTHR.EUS RUPESTRIS. 



Acarus lapidarius fuscus, linea dorsali bicolori, Lin. Faun. 

 Suec. 349, no. 1202. — Acarus rupestris, Lin. Syst. 1026. 

 Faun. Suec. 2d edit. 484. Mull. Zool. Dan. prod. 187, no. 

 2224. Turt Gmel. iii. 706. Stew. Elera. ii. 323.— Ery- 

 thrasus phalangioides, Latr. Gen. Crust, et Ins. i, 146. Leach 

 in Edin. Encyclop. vii. 416. Stark Elem. ii. 205. Lam. 

 An. s. Vert. v. 61 ; 2de edit. v. 80. Griffith's Cuvier, xiii. 

 pi. 11, fig. 5 (not good). — Rhyncholophus De Geer, Duges in 

 Ann. des Sc. Nat. (1884) i. 30. — R. phalangioides, Koch. 

 Uebers. 51. — Trombidium phalangioides, Gervais in Walck. 

 Insect. Apt. iii. 176. 



Desc. Mite two lines in length, depressed, of a purplish- 

 red colour, with a paler or yellowish-orange fascia down the 

 back enlarged into a roundish patch at both ends or one 

 only ; the legs much longer than the body, filiform, purplish- 

 red or scarlet : Bod?/ quadrangular, narrowed in front, with 

 swollen shoulders, behind which the sides are widely but not 

 deeply sinuated, the posterior end obtusely rounded, the whole 

 covered with short stifi" black hairs : Back flattened, uneven, 

 marked between the shoulders with a pale roundish spot, 

 continued down the middle as a narrow fascia into another 

 spot placed above the anal region, which is suddenly and 

 obliquely depressed : Venter somewhat convex, of the same 

 colour as the back, with a large yellowish patch behind : Ros- 

 trum declivous, setaceous, acute, shorter than the palpi : Palpi 

 porrect, tapered, of a uniform red or scarlet colour, hirsute, 

 1st joint minute, 2d large, 3d smaller, the fourth unquiculate, 

 slightly curved at the apex with three or four acute serra- 

 tures beneath it, and a pear- shaped bristled appendage hangs 

 underneath from the articulation : Legs 8, homologous, fili- 

 form, hirsute, all of them longer than the body, of a fine red 

 colour variable in its intensity, the last joint usually paler, 

 and the two basal joints often of a fine lemon yellow; 6-jointed, 

 Ist joint small and subglobose ; 2d longer, oval ; 3d elliptical, 

 twice as long as the second ; 4th rather longer than the third, 

 swollen on the inner edge ; 5th longer than the fourth, fili- 

 form and narrow ; 6th ovato-elliptical, heavy, and enlarged, 

 truncate or obtuse at the end, and furnished with two small 



