EUSTROTIA] PLUSIADAE 165 



18. EUSTROTIA, Hb. 



Characters of Erastria, but abdomen not crested. 



A genus of considerable extent and very general distribution, 

 but absent from New Zealand, and most plentiful within the 

 tropics. Larva with prolegs on 7 and 8 shorter, rudimentary, 

 or absent. Pupa in a cocoon. 



1. Hind wings sharply marked with blackish and 



whitish . . . .2. 



not so marked . . .3. 



2. Forewings with tips of apical cilia white . 3. luctuosa. 



,, fuscous 2. lucida. 



3. Forewings with two straight white fasciae 4. argentula. 



without such fasciae . . .4. 



4. Forewings with two crimson fasciae . 6. viridaria. 



without crimson fasciae . . 5. 



5. Forewings with disc dark brown . . 5. uncula. 



not dark brown . 1. venustula. 



1. E. venustula, ffb. 18-20 mm. Forewings brownish- 

 ochreous, rosy- tinged, suffused with white towards base of 

 dorsum; first and second lines white, first obsolete towards 

 costa; spots partly outlined with white, orbicular and reni- 

 form only on lower ends, between these a blackish spot ; sub- 

 terminal line suffusedly white, more or less interrupted in 

 middle, where there are two or three blackish marks. Hind- 

 wings brassy-grey-whitish. 



Essex (Epping Forest), local; C. Europe, WC. Asia to N. 

 Persia; 6, 7. Larva purplish - brown ; dorsal line pale, indis- 

 tinct ; a pale lateral spot on 5 ; head brown : on flowers of 

 Potentilla reptans ; 8. 



2. E. lucida, Hufn. (solaris, Esp.; albicollis, F.) 25-27 mm. 

 Forewings dark brown, partially tinged with yellowish and 

 purplish ; basal area ochreous-white, more or less spotted with 

 grey ; a large subquadrate ochreous-white spot on costa beyond 

 middle ; second line indicated by a series of blackish marks 

 rising from this spot ; subterminal whitish on dorsal half ; cilia 

 on lower half of termen white. Hindwings varying from yellow- 

 whitish with dark fuscous costal spot and terminal fascia, to 

 dark fuscous with a median row of two or three yellow-whitish 

 spots. 



Once recorded, locality unknown, probably a rare immi- 

 grant ; C. and S. Europe, WC. Asia to Turkestan, N. Africa ; 

 5, 8. Larva without prolegs on 7 and 8 ; brown-grey, reddish- 



