314 Mr. H. T. Stainton's Synopsis 



47. Elach'ista Cerusella, Hiibner. 



Not very closely allied to any other species ; the darker colour 

 of the two fasciae, and the first fascia not being angulated, suffi- 

 ciently distinguish it from Ulonella and Rhynchosporella. 



Expansion of the wings 5 lines. Head whitish ; anterior wings 

 whitish, with some scattered fuscous scales ; beyond the middle is 

 an interrupted fuscous fascia, broadest on the inner margin, and 

 internally with a black spot on the fold, and towards the apex is 

 another fuscous fascia, with a minute black spot internally ; some- 

 times there is a blackish spot on the inner margin, not far from the 

 base. 



The larva, which is pale primrose yellow, mines the leaves of 

 the reed {Arundo Phragmites), making broad white mines, in 

 April and July. 



The perfect insect appears in May and August, and seems very 

 widely distributed. 



48. Elachista Utonella, Frey. 



Closely allied to Contaminatella and Rhynchosporella. From 

 the former it is distinguished by the broader, more obtuse an- 

 terior wings, and more distinct fasciae ; and the black scales at 

 the angulation of the first fascia are much less developed. From 

 Rhynchosporella it is distinguished by its whiter ground colour, 

 and by the much more distinct hinder-marginal line in the cilia. 



Expansion of the wings 4 — 4^ lines. Head white ; anterior 

 wings white, tinged with pale fuscous along the costa towards the 

 base, and sometimes, though slightly, towards the inner margin. 

 In the middle of the fold is an oblong black spot, beyond it is a 

 brownish angulated fascia, which meets a paler brownish fascia, 

 which is almost parallel to the hind margin ; cilia greyish, inter- 

 sected by a distinct blackish hinder-marginal line. 



The yellow-green larva, which has a black head, makes broad 

 flat mines in the leaves of Carex glauca in May. 



The perfect insect appears at the end of June and beginning of 

 July; it occurs near Ziirich. 



49. Elach'ista Contaminatella, Zeller. 



Closely allied to the preceding, and perhaps not truly speci- 

 fically distinct, but the fasciae are much less distinct, and the 

 small scales at the angulation of the first fascia are far more con- 

 spicuous. 



