376 LEPIDOPTERA. 



and the hind marginal dots elongated into streaks. These 

 forms, which seem especially to be found among ^cahioMi 

 columbaria, form the variety (or supposed species) called 

 plagiodadyluft, Stn. which was believed to be distinct, till it 

 was found that o,raong>iaihiosct, snccixn. in the Fens another form 

 existed, of the full size of J/. jilc^'J^odndybix, with considerable 

 variation in colour, and the precise markings of the typical 

 form. This was found completely to bridge over the differ- 

 ences, and to unite these forms as one species. 



On the wing from June till October; but apjjarently in two 

 generations. 



Larva about five liues in length, of moderate proportions, 

 neither stout nor slender, tolerably cylindrical, tapering a little 

 behind: head i-ounded, rather smaller than the second segment, 

 of a very pale brownish-yellow colour and shining ; body 

 very pale olive-yellow, with a conspicuous brown dorsal line 

 attenuated at each end, and with two faint lines along the 

 side a little deeper in tint than the ground colour ; on the 

 lowest line are the black spiracles, each on a slight swelling ; 

 raised dots of the ground colour and furnished with rather 

 long curved whitish hairs ; the head and other parts of the 

 body emit short hairs. (W. Buckler.) 



Of the second generation Eossler writes " spindle-shaped, 

 verdigris-green, with a broad dull red dorsal line margined 

 on both sides with whitish-green as far as the usual position 

 of the subdorsal line. Head, legs, and sj^iracles brown- 

 black." 



May and .June, and a second generation in August and 

 even September, on Scahio-sa tiuccina, S. arvcnsis, and S. 

 culumbaria, the first brood in the young shoots, gnawing a 

 hole in the side and eating out the interior substance, 

 thereby causing the slioot to droop, when it is quickly hiilden 

 by the growing plant ; but in the second generation feeding 

 upon the flowers. The singular variation in colouring has 

 been noticed above. 



