312 DR. JOHNSTON ON THE ACARIDE3 OP BERWICKSHIRE. 



either they wove not one and the same, or that the painter 

 was much in fault. The hitter I found to be the case, accord- 

 ing to Mons. A. Dugtis. He tells us that in the figure of Her- 

 mann, of which Griffith's is evidently a copy, the legs are repre- 

 sented too long, the corselet or thorax too narrow, its lateral 

 apophyes too much detached, and that the hairs on the back 

 are erroneously represented arranged in a circle instead of 

 in two lines. Assuming these criticisms to be correct, I think 

 that so altered as to meet them, the figure would suit our insect 

 well ; and so I conclude the mite to be the Notaspis clavipes of 

 Hermann. 



Now, according to M. Gervais, this Notaspis is synonymous 

 with the Acarus geniculatus of Linnaeus, and the descriptions 

 will not allow a dispute on this point Hence we were 

 brought back to our first conclusion, and willingly, for we 

 do love to look upon a Linnaean species. Latreille's Oribata 

 geniculata is of course a different species. 



18. Acarus baccarum, Lin. 



Acarus arboreus ruber distentus, lateribus obscurioribus, 

 Lin. Faun. Suec. p. 349, no. 1201. — Acarus hsLCcarum, Lin. Syst. 

 1025. Faun. Suec. 2d edit 483. Mull. Zool. Dan. prod. 187, 

 no. 2225. Turt. Gmel. iii. 705. Stew. Elem. ii. 322. 



Desc. Mite of a reddish- orange colour darker on the 

 sides, with legs similarly coloured, and longer than the body : 

 Bod^ ventricose, broadly ovate or purse-shaped, widest be- 

 hind and almost truncate, very slightly sinuated on the 

 sides at the middle, where there is a fixint and false appear- 

 ance of a transverse division ; the 'certex swollen and paler 

 with a darker spot in front of it ; mnter convex, of the same 

 colour as the back with a deeper fascia, smooth, furnished 

 with some short bristles ; the hack armed with pale bristles 

 arranged in four longitudinal series : Eyes 2, placed one on 

 each side anteriorly, dark-brown, very distinct : Bostrum 

 conical, porrect, bristled : Palpi two, pediform, longer than 

 the rostrum, upper half bent downwards, bristly, 4-jointed, 

 1st joint short, 2d large, 3d small, 4th elongate, slenderer, 

 cylindric, furnished towards the extremity with long bristles : 

 Legs 8, equidistant, originating anteriorly and close together, 

 homologous, hirsute and bristled, pellucid, paler on the up- 

 per half, the distal of the colour of the body ; 1st and 2d 

 pairs nearly of the same length ; 3d shorter, and the 4th 



