1881.] 173 



position of it in the two forms, offering prima facie evidence that there 

 are two species, and not merely different stages of development in one 

 species as has been stated. (1). In one type the upper surface is 

 smooth, almost flat within the border (which also is regular, compact, 

 and smooth), and destitute of imbrication, the segments being dis- 

 tinctly visible from side to side, only divided in the middle by a 

 continuous, longitudinal, impressed line. (2). In the other type the 

 border is less regular and more flaky, especially in the adult, and the 

 whole dorsal surface is covered with protuberant, overlapping, scale- 

 like or flaky lamellae in two longitudinal rows or ridges, whereby the 

 segmentation of the body is quite hidden. 



(1.) In the first type there are, in the adult ? , other specialities : 

 —the broad, short-oval form, the pale cream-white colour, the tes- 

 taceous colour of the legs and antennae, the tarsus as long as the tibia ; 

 :the antennae short, stout throughout ; the broad caudal lamination 

 projecting beyond the border to a comparatively short extent, its ex- 

 tremity broadly rounded, its surface longitudinally crenate (not 

 lamellate). This caudal projection arises below the circumferential 

 border of the body, which remains entire : it forms the covering part 

 of the tnarsupiwm, which contains at first the eggs, and then the young 

 larvae. (The same kind of structure, but of larger dimensions, exists 

 in 0. urtica?) To this type belong, as one distinct species (O. 

 catapliracta) , — 



Coccus cataphr actus, Shaw, Nat. Misc., v, pi. 182 (1791), Gren. Zool., vi, 194, pi. 

 62 (1806). 



? . Dortkesia cataphr acta, West., Intr. Mod. Class. Ins., ii, 443, fig. 118, 20 (1840). 

 ? . Dorthesia chiton, Zett., Ins. Lap., 314 (1840). 



$ . Orthezia urticce, Sign. syn. partim, Essai sur les Cochinelles, 423 (1875). 

 ? . Orthezia Sigvoreti, R B. White, Scot. Nat., iv, 160, pi. 2, fig. 1, antenna} (1877). 



In the Scotch examples, for which I am indebted to Dr. P. 

 Buchanan "White, there is, on the middle line of each of three anterior 

 i (thoracic) segments, a very small scutelloid process or appendage: 

 these are represented in Shaw's figure, but are exaggerated. 



The adult $ has not been observed, but Dr. Buchanan White says 

 (I. c.) : " I have only seen one <$ larva, and that not in good condition, 

 but, as far as I could judge, the antennae resemble in structure that of 

 the larva of urticce." 



The species appears to have been found only in northern regions 

 — Lapland, Greenland, Norway, Scotland, Ireland, and the north of 

 England. 



(2.) In the second type, in the adult $ , the other characters to 

 be noted are : — the long-oval form ; snow-white colour ; the piceous 



