DR. JOHNSTON ON THE ACAEIDB8 OF BERWICKSHIRE. 289 



with elongated branching stems, thickly beset with pellucid 

 and veinless, 1, nerved, sessile, whorled or opposite leaves," 

 which, in the specific character, he says are " oblong, ovate 

 or lanceolate, finely serrulate (4 long)." — All this agrees with 

 our Berwickshire plant. Dr. Gray continues, — " The stam- 

 mate flowers break off as in ValUneria^ and float on the sur- 

 face, where they expand and shed their pollen to fertilize 

 the stigmas, which are raised to the surface by the excessively 

 prolonged calyx tube which varies in length according to the 

 depth of the water." — Bot North. Un. States, p. 462. 



The AcARiDES of Berwickshire specifically described. 

 By George Johnston, M.D., &c. (Continued from page 233.) 



7. Trombidium holosericeum. 



Blaine- worm, Mouf. Insect. Theat. c. 19, p. 141. — Ara- 

 neola ruberrima boves mordens, Blain worms, Twings, et in 

 Borealibus, Tings^ quae inter buprestas numeratur, a Mouf 

 141, 9, Merret Pinax, 203. — Araneus exiguus, coccineus, 

 vulgo Anglice a Tant dictus. List. Anim. Aug. 100, tab. fig. 38. 

 — Araneus Anglicus coccineus minimus, Petiv. Mus. p. Q5j 

 no. 701. — A earns terrestris ruber abdomine depresso, Lin. 

 Faun. Suec. p. 348, no. 1200. Geoff. Hist. Insect, ii. 624.— 

 Acarus holosericeus, Lin. Syst. 1025. Faun. Suec. 2d edit. 

 482. Midi. Zool. Dan. prod. 186, no. 2216. Fabric. Faun. 

 Groenl. 222. Turt. Gmel. iii. 709. Stew. Elem. ii. 324.— 

 Scarlet Acarus, Loud. Encyclop. Garden, p. 435, fig. 411 b. — 

 Trombidium holosericeum, Latr. Gen. Crust, et Insect, i. 145. 

 Lam. An. s. vert. v. 63 ; 2de edit. v. 83. Laireille in Cuv. 

 Reg. Anim. iv. 284. Griffith's Cuv. xiii. 503, pi. 17, fig. 2. 

 Bisso I'Europ. merid. v. 179. Orr's Cuv. 470. Leach \n 

 Edin. Encyclop. vii. 416; and in Sarfi. Ent. Com. 131. 

 Wakk. and Gero. Insect. Apt. iii. 179, pl. 36, fig. 1. 



Desc. Mite |th, of a uniform scarlet colour and velvet ap- 

 pearance, with legs about the length of tlie body : ^o(fy quad- 

 rangular with obtusely rounded angles, widest in front, 

 sinuated behind, the back flattened, foveolate, a square space 

 in front circumscribed by an impressed line, and behind it a 

 short mesial line with two lateral foveola?, and a deep im- 



