164 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 90 



Biganorosis Waui^ngken, Ent. Tidskr., vol. 2, p. 94, 1881. (Genotype: Phalaetm 

 Tortrix Iwracliana Linnaeus, Systema naturae, ed. 10, p. 532, No. 225, 1758.) 



Head with appressed scales ; tongue developed ; antenna simple or 

 moderately ciliated; basal segment elongate, with pecten. Labial 

 palpus long, recurved ; second segment reaching base of antenna, with 

 rough, projecting scales and furrowed beneath; terminal segment 

 shorter than, or rarely as long as, second, acute. Thorax smooth or 

 crested. Abdomen flattened. 



Fore wing with 12 veins; 2 and 3 separate, 7 and 8 stalked; 7 to 

 costa or apex, 11 from middle. 



Hind wing as broad as or broader than the fore wing; 8 veins, 3 

 and 4 connate or short stalked; 6 and 7 subparallel. 



3Iale genitalia. — Harpe with or without clasper and with or with- 

 out process from base of sacculus. Anellus a well sclerotized plate 

 without long lateral processes. Aedeagus stout with or without 

 cornuti. Gnathos an oval, spined knob. Socii well developed. 



Female genitalia. — Genital plate strongly sclerotized ; ductus bursae 

 frequently sclerotized for a considerable portion of its length; signum 

 present (in all species seen) though frequently weak. 



Larva. — Ninth abdominal segment with setae I and II well sep- 

 arated; seta VI not on the same pinaculum with IV and V, remote 

 from VII. Setal group VII bisetose or trisetose on first abdominal 

 segment, bisetose on seventh and eighth abdominal segments,-^ and 

 unisetose on ninth abdominal segment. Ocelli normal. Submentum 

 without pit. 



Group A : Setal group VII on first abdominal segment &^setose. 

 licracliana 

 juliella 

 dracunouU 



Group B : Setal group VII on first abdominal segment ^Wsetose. 

 multifidae 

 leptotaeniae 

 angustati 



Pupa. — Pubescent. Prothoracic femora exposed. Labial palpi not 

 exposed. Cremaster absent. 



Remarks. — The separation of Depressaria from Agonopterix is dis- 

 cussed under the latter genus. 



In this genus there are five distinct species groups. The first, con- 

 sisting of atrostrigella and dracuncul't., and probably palousella (males 

 not known), is characterized by the process from the costa of the 

 harpe in the male and the broad, somewhat dilated sclerotized band 

 in the ductus bursae of the female. The second group consists of 



** Rarely unisetose on eigbth segment and if so trisetose on first. 



