Dr. Johnston on the Acarides of Berwickshire. 113 



some insect pricking the buds (Hist. Plantes des environs de 

 Paris, 149: Paris, 1698). 



Another alleged production of mites is the white tufts so 

 abundant in some places at the summit of the shoots of wild 

 thyme. I have not had an opportunity of examining them 

 lately ; but young specimens that I brought from Northumber- 

 land in July, afforded no traces of a gall-midge to which they 

 had been ascribed by various writers. 



In conclusion, I may mention, that I shall feel obliged to any 

 member of the Club for fresh specimens of the following galls, 

 should they ever occur during their researches : — 



Smooth galls on the leaves of the beech. 



Smooth galls on the leaves or buds of the lime. 



Galls on the dyer's green weed [Genista tinctoria). 



Galls on the bryony and the box-wood. 



Galls and excrescences on Salix alba, S. purpurea, and S.fragilis. 



Large gall on the stalk oiHieracium sabaudum and Cnicus arvensis. 



The Acarides of Berwickshire specifically described. 

 By George Johnston, M.D. 



[Continued from vol. ii. p. 373.] 

 28. Rhyncholophus errans. 

 R. lavis ruber thorace pedibusque coccineis, dorso foveolis notato setis 

 brevissimis (nee sine speculi auxilio conspicuis) falcatis et ad basim 

 incrassatis velato, setis crurum acutis simplicibus. Long. 1^ lin. 



Bescrip. Mite blood-red with scarlet thorax, legs and palpi^ 

 smooth to the naked eye. Body ovate, rostrate in front, broadest 

 at the shoulders, rounded and entire behind and on the sides, 

 clothed with very short curved spines with a bulbous base (fig. a), 

 to be seen only on the margins under a high magnifier; the 

 back flattened, uneven, marked with a foveolate furrow along each 

 side and with a large depression just above the extremity; the 

 venter convex, even and smooth, of the same colour as the back ; 

 the anus inferior and subterminal ; the generative pore twice as 

 large, mammillary, and nearly central. Thorax distinctly sepa- 

 rated by a transverse line from the body and narrower than it, 

 triangulate, uneven, with a black eye at each side on a mammil- 

 lary swelling. Mandibles porrect, consisting of two parallel, 

 elongated, tapered, smooth shafts, terminated each with a small 

 claw (fig. b), and having a protrusile stylet between them. 

 Palpi (fig. c) large and pediform, hirsute, porrect, the two basal 

 joints short, subequal and narrow; the third large, bulged, and 

 twice as long as the fourth, which tapers gradually into the fifth, 



