330 POLYPLOCA. By W. Warren. 



darker terminal border; in the darker grey examples the narrow pale median area becomes as dark as the bands, 

 hlimedia. which are not filled in with brown, forming a broad dark median fascia edged by pale lines, = ab. latimedia 

 nubilata. ab. nov. (56 b); these grey forms are all from Herculesbad, Hungary; in the ab. nubilata Tutt from the 

 North of England the usual bands and the base are dark chocolate bro\vii. Occurs iia South and Central Europe, 

 in Belgium, Denmark, Britain, N. Germany, Italy; and in Pontus, Asia Minor. Larva pale yellowish, greyer at 

 the sides; dorsal line grey; spiracular pale yellow; tubercles black; head fuscous; feeding between united leaves 

 of oak. 



flavicortiis. P. flavicornis L. (= cinerea Atiriv.) (49 h). Forewing greenish grey densely black scaled; costa in 



median area broadly pale; the subbasal and double inner lines obliquely curved outwards, indented on sub- 

 median fold, the subbasal followed by a pale space, the two inner blacker with a grey line between them; outer 

 line black, indented on each fold, and elbowed outwards at vein 4, followed closely by a hght and at a distance 

 by a dark grey dentate line ; subterminal line pale grey followed by a blackish waved line and meeting a black 

 oblique streak from apex; orbicular stigma large and roundish, whitish or greenish white, or yellowish white, 

 sometimes coalescing with the smaller whitish reniform; hindwing didl grey with a brownish fuscous ter- 

 galbatius. minal border and pure white fringe; a darker outer line is sometimes marked; ab. galbanus TuU (56 c), from 

 the South of England, has the ground colour pale green, with the markings not so prominent, the stigmata 

 scolica. whitish; in ab. scotica Tutt, from Scotland and? E. Siberia, (56c) the ground colour is dark grey with the 

 I inmarchica. casta, at middle and the stigmata pale; in finmarchica Schoyen (56 c) from Lapland and Norway, the whole 

 wing is blackish and the hindwing dark grey. North and Central Europe, N. Italy, S. E. Russia. Larv^a greenisli 

 grey below, darker, more grey brown, above; subdorsal and spiracular series of black spots; tubercles white; 

 head reddish bro\ni; in rolled leaves of birch when young, afterwards between united leaves. 



ridens. P. rldens F. (= erythrocephala Esp.) (49 i (J, 56 c $). Forewing very dark fuscous green on a whitish 



ground ; the inner, outer, and subterminal lines greenish white ; the inner excurved above and below median and 

 preceded on costa by an irregiilar white patch ; outer line less distinct ; the subterminal strongly dentate ; the 

 stigmata whitish, often suffused and hidden; a grey median line sometimes evident; a deep lunulate terminal 

 line, tlio lunules filled with greenish white; fringe grey with greenish white tips, rayed throughout with black; 

 hindwing whitish clouded with grey; a broad greyish bro\\ii terminal border beyond a curved whitish outer 

 xanihoceros. band; the veins dark; in the form xanthoceros Hhn. (56 c) the extreme black scahng is absent and the white 

 interrupta. lines are replaced by brownish grey; this latter is the usual form in Britain; in interrupta Tutt (56 c) the ground 

 colour is paler grey throughout, and the central fascia is intei'nipted by a grey space across wing; in the ab. 

 concinna. coticinna ah. nov. (56 c) the basal area and the whole space beyond median fascia to termen is pale bluish green ; 

 the extreme base with some olive and fuscous scales; the median area olive fuscous, with the two lines and the 

 veins black, the stigmata marked with pale green scales; the subterminal line sagittate, interrupted on vein 5; 

 the terminal line lunulate, and the fringe white intersected by black wedge shaped marks beyond veins : hind- 

 wing white with termen narrowly grey; the example, a $, is of English origin, being low set, and evidently bred, 

 but without exact locahty. Occurs throughout Central Eiu-ope, in Britain, Northern France, Spain, Denmark, 

 and Livonia. Larva yellow ; dorsal and spiracular hnes green ; subdorsal green, but usually interrupted; lateral 

 and subspiracular series of small black spots; tubercles white; head orange ochreous; between spun together 

 leaves of oak. 



ruficollis. P. ruficollis F. (49 i). Forewing dull greenish cinereous; inner band consisting of two diffuse dark 



grey shades, preceded by an obliquelj' curved grey hne and followed by a fine black hne, this last vertical and 

 slightly outbent below costa ; outer line double, filled in with dark grey, excurved from vein 6 to 2, then vertical; 

 subterminal line very faint, slightly darker, meeting a fine oblique apical streak; terminal line black; fringe con- 

 colorous; reniform stigma of the ground colour with black outline, touching outer line; hindwing dull pale grey, 

 ■with paler fringe and a rather large discal spot. The (J, which is rather larger than the 9. li^s the pale bands 

 before and after the median fascia tinged with rufous bro%vn, the vertex of head and the tegulae also bro^ni; 

 the antennae of the ^ have short clavate pectinations. Restricted to the South of Europe, France, Switzer- 

 land, Italy, Greece, Carniola, Austria and Hungary. 



arctipentiis. P. arctipenilis Biitl (49 i). Forewing pale grey, dusted and banded with darker; basal area darker 



grey, with a black spot at base of submedian fold ; inner band fornied of two black lines elbowed outwards on 

 each fold, preceded by a diffuse dark grey band separated from basal patch by a pale line ; outer line double, 

 the inner arm blacker, angled outwards on vein 4, and again less strongly at vein 1 ; a double dark grey line forming 

 a kind of band before the pale subterminal, which is externally bounded by a row of black lunules, met by an 



