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, aflforded 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. Icevis ruber thorace pedibusque coccineis, dorso foveolis notato setts 

 hrevissimis {nee sine speculi atuvilio conspicuis) falcatis et ad basim 

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



Descrip. 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, mammillaiy, 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 swelhng. Mandibles porrect, consisting of two parallel, 

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

 claw (fig. /;), 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, 



