TRIFURCULA. 355 



to illustrate his diagnosis. This constitutes pallidella the type of the 

 genus. Zeller's diagnosis {Linn. Ent., iii., p. 330) of the genus is as 

 follows : — 



"Caput lanatum, etiam in epistomio. Antennas breviusculae, nudse, conchula 

 modica instructse. Palpi breves, penduli. Alae anteriores grosse squamatse, cellula 

 discoidali nulla ; vena subcostali furcata, mediana arcuata in tres ramos divisa, 

 subdorsali simpliei longa. Posteriores : vena mediana in tres ramos divisa, sub- 

 dorsali (?) longiuseula." 



The main characters of the genus would appear to be as follows : — 



Imago. — Head hairy ; tongue rudimentary ; antennas simple, naked, the basal 

 joint furnished with an eye-cap ; maxillary palpi rather long, filiform and folded ; 

 labial palpi short, filiform ; fore-wings lanceolate, coarsely scaled ; hind-wings 

 lanceolate. 



Pupa. — Unknown. 



Larva. — Practically unknown. Mining leaves and twigs of leguminous 

 herbaceous plants (Glitz). 



Ovum. — Unknown. 



This small genus is unknown outside Europe and Asia Minor. 

 Besides the three British species, only T. serotinella, a species that has 

 been captured in Bavaria and Norway, and T. confertella, Fuchs 

 (Stett. Ent. Zeit., lvi., pp. 47-48, 1895), from Loreley, in June, are 

 known to science. 



TRIFUECULA IMMUNDELLA, Zeller. 



Synonymy. — Species : Immundella, Zell., " Isis f " 1839, p. 215 ; " Schles. 

 Tausch-ber.," iv., p. 21 (1843); Ibid., vi., p. 16 (1845); "Linn. Ent.," iii., p. 332 

 (1848); Sta., "Trans. Ent. Soc. Lond.," v., p. 139 (1848); "Ins. Brit.," p. 307 

 (1854); "Man.," ii., p. 438(1859); "Ent. Ann.," 1862, p. 140; "Ent. Ann.," 

 1874, p. 51 ; H.-Sch., " Sys. Bearb.," pi. 108, fig. 861 (1853) ; v., p. 359 (1855) ; Frey, 

 " Die Tineen," etc., p. 396 (1856) ; " Die Lep. der Schweiz," p. 426 (1880) ; Staud. 

 and Wocke, " Cat.," p. 335 (1871) ; Hein. and Wocke, " Schmett. Deutsch.,"p. 726 

 (1877); Snellen, " De Vlinders," etc., p. 967 (1882) ; Sorhagen, " Die Kleinschmett. 

 Brandbg.," pp. 301 and 344 (1886) ; Meyr., " Handbook," etc., p. 727 (1895). 



Oeiginal description. — Lyonetia immundella, Zell., von L. cristatella 

 dadurch verschieden, dass in die silbergraue Farbe der Vorderflugel 

 grobe, braunliche Schuppen eingemischt und die Kopfhaare braunlich 

 sind ; die Augendeckel schmutzig gelblichweiss. 9 Ex. bei Glogau am 

 8ten Juni Abends an Spartiwn scoparium gefangen (Zeller, Isis, 1839, 

 p. 215). 



Imago. — Head yellowish (sometimes violet, Sta.). Anterior wings 

 7-8 mm., whitish, dusted with grey scales throughout; cilia whitish. 

 Posterior wings pale grey, cilia yellowish. 



Variation.- a. var. squaviatella, Sta., " Cat.," p. 30 (1849) ; " Ins. Brit.," p. 

 307 (1854) ; "Man.," ii., p. 438 (1859) ; H.-Sch., " Sys. Bearb.," v., p. 360 (1855) ; 

 Staud. and Wocke, " Cat.," p. 335 (1871).— Head yellowish. Anterior wings 8 mm. 

 in expanse ; yellowish-white, dusted with coarse dark grey scales ; the costa and 

 inner margin less suffused ; a slender curved line along the disc, uninterruptedly 

 whitish ; cilia yellowish-white. Posterior wings grey, with yellowish cilia. 



Stainton, after describing this insect, notes that " T. immundella 

 is much less than T. squaviatella ; the anterior wings darker ; head 

 purplish-grey ; posterior wings with grey cilia." He further remarks 

 (Ins. Brit., p. 307), that the few known specimens "occurred among 

 broom in August, in company with T. immundella, of which it is per- 

 haps a variety." Bankes has examined Stainton's type specimens, 

 and considers it " certainly only a form of T. imvnindella." The type 

 specimens were captured by Bedell and Sircom, and others by Stainton, 

 on August 9th and 20th, 1849, at Charlton. Sircom's specimens came 

 from Bristol, and Wilkinson afterwards recorded others from 



