NEPTICULA WOOLHOPIELLA. 293 



pale green," whereas it is yellow — indeed, a deep yellow — the greater 

 part of its life, but becoming paler when practically adult ; it borrows 

 something of a greenish tinge from its surroundings, though its true 

 colour is still yellow, as can be ascertained by removing it from the 

 mine. The larva of this species feeds up much more quickly than 

 that of N. argentipedella, and is always to be found with its head at 

 the margin of the mine, either actually eating or just ready to eat. 



Cocoon. — The cocoon, which is spun up beneath the soil, is very 

 roughly oval in outline, flattened, but raised considerably in the central 

 area of the upper part, so that the base bends considerably beyond 

 the somewhat flattened dome that surmounts it. The cocoon is made 

 of closely woven black silk, the outside in contact with several small 

 pieces of earth. The inside of the cocoon is rather smooth, and very 

 shiny, but of the same colour and texture as the outer part. [De- 

 scribed under a two-thirds lens, June 7th, 1898, from cocoons sent 

 by Dr. Wood.] Wood supplied the larva; with earth in which to pupate. 

 The pot containing them was kept out of doors, and the treatment 

 proved most successful. Length of cocoon 2-75 mm., breadth 2 mm. 



Food-plant. — Betula alba. 



Time of appearance. — The species is single-brooded, imagines 

 appearing in May-June from larvas that feed up in August and 

 September. Threlfall bred imagines in May and June, 1888, from 

 larvae obtained on July 25th and in August, 1887, at Witherslack. 



Localities. — Hereford : Woolhope (Wood). Lancashire : Grange (Threl- 

 fall). Westmorland : Arnside (Hodgkinson), Witherslack (Threlfall). 



NEPTICULA LAPPONICA, Wocke. 



Synonymy. — Species: Lapponica, Wocke, " Stett. Ent. Zeit.," 1862, p. 251; 

 Staud. and Wocke, " Cat.," p. 339 (1871) ; Wallgrn., " Ent. Tids.," ii., p. 130 (1881) ; 

 Wood, "Ent. Mo. Mag.," xxix., p. 272 (1893); Ibid., xxx., p. 95 (1894); Meyr., 

 " Handbook," etc., p. 724 (1895). Lapponicella, Porritt, " List of Yorks. Lep.," p. 170 

 (1886). 



Original description. — Capillis sordide ferrugineis, antennarum 

 conchula parva flavescente-albida. Alis anter. griseis obsolete rubes- 

 centi-violaceo-micantibus, apice leviter violaceo-tincto, fascia obliqua 

 postica exalbida, ciliis griseis. Exp. alar. 6^-7 mm. Mit keiner 

 verwandten Art zu verwechseln, am ahnlichsten noch blassen 

 Exemplaren von N. salicis, doch durch bedeutendere Grosse, andere 

 Farbung der Kopfhaare etc. leicht zu unterscheiden. In der Grosse 

 iibertrifft sie um ein Geringes die N. argentipedella, ihre Gestalt ist aber 

 weit schlanker, der Korper diinn, die Fliigel gestreckt und ziemlich 

 schmal. Kopfhaar schmutzig rostgelb, nach hinten meist etwas heller 

 als vorn. Fvihler hellgelbgrau, nach der Spitze zu am dunkelsten, an der 

 Basis gelblich, die Muschel klein, gelblichweiss. Riicken gelblich- 

 grau, griinlich oder rothlich schimmernd. Beine gelbgrau glanzend. 

 Hinterleib des $ einfarbig dunkel gelbgrau, der des 2 heller, oben 

 mit eingemengten einzelnen opalisirenden Schuppen, unten seiden- 

 glanzend. Vorderflugel auf gelblichem Grunde grob dunkelgelbgrau 

 beschuppt, von der Seite betrachtet rothlich, in der Spitze violett 

 schimmernd. Am Anfang des letzten Flugeldrittels liegt eine grade, 

 ziemlich breite Querbinde von blassgelblicher Farbe, ihre Bichtung ist 

 etwas schrag, indem ihr Vorderrandende mehr nach innen liegt, als 

 das dicht am Hinterwinkel befindliche Innenrandende, bei den meisten 

 Exemplaren ist diese Binde tiberall von gleicher Breite, bei einigen 



