1893.] 131 



having 13 — 15, the anterior laterals each 24 — 33, usually the latter, the posterior 

 laterals 19 — 26. Of the posterior marginal lobes, the median two, lying close to- 

 gether, have parallel sides, are very much prolonged inwardly, but at little more than 

 half their length are narrowed suddenly from the inner side, thence they are 

 extended, somewhat divergently, each to a sharp point, the base of the prolongation 

 having a short, sharply toothed, projection ; the extensions of the two lobes resembling 

 a two-pronged fork : exterior to the two median lobes are on each side of them four 

 narrower ones, also similarly extending inwards ; the first of these reaches nearly 

 to the level of the base of the median furcation, and has a deep apical cleft, so that 

 it presents two long acute points ; the second is much longer, and has one acute 

 point ; the third is nearly as long, and has two very long sharp points ; the fourth 

 small, about the length of the first, and, like it, has a bifid termination ; on each of 

 the lobes posteriorly is an elongated pore ; except the fourth lobe, which has its base 

 on the margin, the external end of each lobe projects a little beyond the marginal 

 line, is suddenly gradate on each side, and is then extended in a short rounded pro- 

 jection : beyond the lobes the margin is an almost regular curve, the limits of the 

 marginal plates being scarcely indicated, but about half way along the curve is a long 

 projecting marginal spine, and near the junction with the next segment are four 

 short, stout, contiguous spines well within the mai'gin, but extending beyond it. 

 The ventral surface only has oval or rounded pores. (Fig. 2 represents the marginal 

 structures more enlarged). Length, H — 2 mm. 



(J scale clear white, of the usual form, i. e., elongate, parallel sided, end 

 rounded ; tricarinate, the median keel distinct, the side keels slight ; the larva 

 exuvise at the anterior end also white. Length, 1 mm. 



This species, in respect of the ? , seems to approach Gh.furfurus 

 Fitch (Comstock, Eeport for 1880, p. 315, pi. vi, xvi and xvii), but it 

 differs greatly in the number and form of the lobes and in the number 

 of the marginal spines of the last segment, and also in the dorsal 

 spinnerets. It is a very distinct species, and does not appear to have 

 been described. 



In September, 1892, Dr. O. M. Eeuter sent from Abo, Finland, a 

 number of the scales with the following information : — 



" I herewith send you a piece of bark from Mountain Ash {Sorhus aucwparia). 

 The whole stem of the tree and all its branches, even up to the leaf-stalks, were 

 covered with the little red scales, which, when crushed, made a blood-red stain ; and 

 there were also numerous small white ones. I should be very much obliged if you 

 would kindly tell me the name of this species. It was found on June 26th in the 

 parish of Ilmola, 63° north latitude ; some of the red scales (? larvae) were then 

 creeping about." 



Mr. E. Newstead had the kindness to mount fourteen specimens 

 of the ? , all of which exhibited the foregoing characters, and also to 

 make a drawing, which is here reproduced. 



153, Lewisham Road, S.E. : 1892. 



