196 THE entomologist's record. 



(;-}), The best marked specimens from Unst and Perth show equally 

 well defined fasci;e Avith penziana, in fact, the basal fascia is in them 

 often more distinctly defined, and fulfils better than many speciinens 

 of the pcnziana form Stainton's emphasised diagnosis, " the outer edge 

 of the basal patch forms an angulated fascia, reachimi to the inner 

 mairiin,'" (4). " It is an inhabitant of sea-side localities," Mr. Barrett 

 considers. This may be, but it is no more confined to them than is 

 jirnziana, unless Kinnoull Hill in Perthshire, the Cogne Valley in 

 Piedmont, and the Val d'Ampezzo in the Tyrol, are to be so considered. 

 In the Cogne Valley, at 7,000 ft. elevation, I found both forms side by 

 side on the same rocks. Of the Unst specimens, Mr. King writes : — 

 " The moths varied considerably, some specimens being almost white 

 with dull markings, while others were almost of an unicolorous dark 

 leaden-blue with the markings just discernible." 



There appear to be three distinct forms of the species : — 



1. Ground colour pure white, with distinct fasciae, although but little irrorated 

 with black dots = hdlatia. Curt. [In my collection from various British localities, 

 Cogne Valley, Mendel Pass, Val Bigontina]. 



2. Ground colour pure white, with equally distinct fascia3, but thickly irrorated 

 with black dots = pciizidiin, Becklin. [Perth, Unst, Val d'Ampezzo]. 



3. Ground colour dark grey, absorbing irrorations, but fascioe distinct = 

 (■(ilqidioitiKiiKi, Sta. (MS.), Barrt. [Kincardine, Unst, Cogne Valley]. 



'6i\. Ground colour very dark, almost unicolorous leaden-grey or leadcn-bluc, 

 largely absorbing fascife. [Unst]. 



Summarising, therefore, we get the intermediate form (2) as the 

 type (earliest described form), and the synonymy appears to work out 

 as follows :-- 



Pi'iiziaiia (Beckl.), Thunb., Diss., iii., pp. .50-7, PI. v., tig. 1 (1791) ; [(?) Hiibu., 

 Tortr., 85(1799); Hiibn., IV;-. bek. Sclim., 390 (1826)]; Ht., Zool, 215o-7; Sta., 

 x¥«H., ii., p. 2.59; Wilk., Tort., p. 256. Cknispersaiia, Schift'., Verz Tort. K., 14 

 Bellana, Curt., lir. Ent., pi. 100; Barr., Knt. Mo. Maq., xx., p. 244; Meyr., 

 Brit. Lep., p .540. Colquhoiiuaiia, Stn. (MS.) ; Dbl., Cat., 2nd Edition., 23 (1866), 

 Harr., Eut. Mo. Mug., xx., 244 (1884). 



Barrett (/''.^/..V., XX., p. 244) is pu/zling. He received a single speci- 

 men of a species, captured in the Alps, from IMons. Ragonot, which he con- 

 sidered was not jirjiziaiia, but which agreed fairly well with Hiibner's 

 figure. He also discovered that Mr. Doubleday "heard many years 

 ago," from Dr. Wocke, that this figure did not represent jwuziana; 

 therefore he sinks Becklin's (not Hiibner's) name (1791) for hcUana, 

 (Uirt., the reason for which is certainly not clear. 



Taking the varietal forms into account, we get the following : — 



Pmziana, Thunb. (Beck.), Hb. (?), Sta. (in part). 



(I. var. luilana, Curt., Sta. (in part)., Barr. (in part). 



/'. var. n)l<jult()}(nana, Sta. (MS.), Dblday., Lixt (2nd Edn.), Barr. 



c. ab. sujf'usa, n. ab. [Extremely dark form oi VAv. cohju/iounana] . 



Wilkinson, I observe, who evidently knew both the pale and dark 

 forms intimately, correctly refers the species to junziana, Thunb., and 

 says of the two forms known to him : " In the typical insect {ride, 

 Curt., Ilrit. Knt., pi. 100) the ground-coloui- is white. There is a 

 beautiful variety taken plenteously by ]^r. Colquhoun, at Ardrossan, 

 which has the ground-colour grey, but the markings are the same." 



Mr. Home, who has kindly sent me two very typical specimens of 

 what he terms pcnziana and cnlquliounana, both correctly named, and 

 representing the white Jwllana and dark cohjuhounana forms, writes : — 

 " It is quite possible that these are one and the same species; both 

 occur at the same time of the year, The great contrast in the nature 



