43 



GENUS 4. Olcthrcutcs, Hb. TYPE arcuclla, Cl. 



The broad head of the valva disappears and is replaced by 

 a long curved valva with almost parallel sides. Uncus 

 sometimes bilobed. Cornuti absent. 



The signa deepen to an extended point. 



Olethreutes pruniana, Hb. 31 



Valva curved, sides parallel spined above, becoming stronger 

 as the sacculus is approached : from the outer edge a patch 

 of specialised hairs in the form of a squared hook at right 

 angles before reaching the point. Uncus narrow, with 5 

 or 6 strong spines at the tip. JMceagus cardinate, short. 

 Ovipositor flattened, narrow. Ostinm deeply cleft with 

 large spined encircling plate. Signa two, produced, 

 scobinate. 



Olethreutes ochroleucana, Hb. 21 



P. Richards. 



Sacculus produced inwardly, terminating with a patch of 

 spines; the outer margin has a large patch of specialised 

 hairs with a curved hook before the point. Uncus bilobed. 

 Ostium rounded with spined encircling plate. 



Olethreutes variegana, Hb. 95 



Sacculus protrudes a small triangular plate, behind which is 

 a small patch of fine minutely barbed spines. Uncus 

 geniculate before the tip, which is considerably widened and 

 bilobed. 



Ostium cleft;, with upright, spined, encircling plate. 



Olethreutes salicella, L. A. Lofthouse. j__i 

 Yalva long, strongly spined below, reaching to the sacculus. 

 Uncus curved. 



Ostium cleft, with upright spined encircling plate. 



