THE VARIATION OF SARROTHRIPUS REVAYANA, SCOPOLI. 103 



Original description. — Tortrix dilutana. This aberration was 

 figured and named by Hiibner; there is no description. The 

 following is one I have made from his figure : 



Base of superiors reddish-brown, with darker outer margin ; 

 next to this is a grey transverse band, followed by another 

 (central) transverse reddish-brown band, outlined by dark lines 

 and shaded with longitudinal dark lines. The outer margin has 

 a double dark line. The anal angle is grey, with a waved, trans- 

 verse, dark-brown line in centre. The head is reddish-brown. 

 Thorax reddish-brown with two dark brown spots. The hind 

 wings are light fuscous. 



The Britisli ab. dilutana are usually more evenly coloured 

 than Hu-bner's figure, with the darker bands and lines not so 

 prominent. The form occurs generally wherever S. revayana is 

 found ; it is not uncommon in the New Forest. 



ab. fascidana, Schmid. 



Synonymy. — ab. fuscidana, Schmid., coit. xxxix, p. 75 (1886) ; 

 Wood, Index Ent. fig. 1042 (1839), lathamianus ; Staudinger, Cat. 

 Pal. Lep. i, p. 361 (1901) ; Hoffmann, Schmett. Eur. ii, p. 124 

 (1908). 



Original description. — " Derselben am niichsten {dilutana), 

 doch verschieden durch den schwanzen mit rostroth libergossenen 

 mittelfleck und der schwarzen Itingstrieme von der fiiigelworzel 

 biszu i des innerverandes." (Schmid., 'Corr.,' xxxix, p. 75.) 



The chief characteristic of this form is the black longitudinal 

 streak at the base of the superiors extending along one-third of 

 the inner margin. This streak is not confined to this form, or 

 even to the ab. dilutana group, several of the others possessing it. 

 ah. fuscidana is equally abundant with its near ally ab. dilutana 

 in the New Forest and elsewhere. 



ab. ohsoleta, n. ab. (PI. I, fig. 6.) 



This form is similar in every way to ab. dilutana except that it 

 is without the dark base to the superiors, and the dark, transverse 

 bands are not so well developed. It is not uncommon in the 

 New Forest. The reddish -brown sufl'asion only shows in the 

 figure as a slightly darker cloud extending over portions of 

 the superiors. 



ab. lathamiana, Swederus. 



Synonymy. — ab. lathamiana, Swederus, K. Vet. Acad, nya Hand, 

 torn, viii, p. 276 (1787) ; GmeHn, Linn. S.N. Edn. xiii, p. 2578, 

 No. 1532 (1788) ; Donovan, Brit. Ins. vol. x, p. 85, and pi. ccevii, 

 fig. 2, figured and described as ilicana (1801) ; Haworth, Lep. Britt. 

 p. 407 (1811) ; Curtis, Brit. Ent. No. 29, lathamianus (1824) ; Curtis, 

 Guide, p. 174, lathamianus (1829) ; Eennie, Conspectus, p. 175 (1832), 



