Hi THE entomologist's RECORD. 



presence of interneural combined markings on the hindwings as 

 common, but to an extent approaching unmarked specimens rather 

 than complete development. 



Note. — Of the 126 set upperside, at least 27 were collected purposely for 

 presence of interneural markings, and 10 set purposely to show their absence. Of 

 the 60 ( + 8) set underside, all were collected without reference to interneural 

 markings. 



Female uppersides. — I. Pathological tendencies. — In certain 

 seasons, under the influence of cold (?), frosts, etc., 2 s occur in which 

 the upperwings have grey apical wedges approaching those which 

 are so markedly noticeable in Poh/oDiiiiatus icanifi 9 s. Grey scales 

 may, in some instances, mark the costal area, or specially the nervures 

 also, as well as replace the orange chevrons. Sometimes these grey 

 scales may even alter the general colour of the upperwing, and render 

 prominent the submarginal black spots. 



II. Chevrons of a primrose colour = ab. flavescens, Tutt. — In 

 the paper in which my remarks on this character occurs, only a very 

 cursory mention of A. thetis aberrations in this direction was made. 

 I should have added that I have seen this colour only in specimens 

 Avhere some bleaching has taken place or is present. 



Dark 5 ab. urania, Gerh. — On pp. 344-5, when reference is made 

 to ab. urania, the character, the absence of the orange chevrons on the 

 upperside is given, but no mention is made of other forms which lack 

 these markings. I possess a 5 almost plain, with only traces of blue, 

 and sub-uranial forms without orange scales. A marked aberration 

 occurs at Folkestone (Sidebotham), and has been found in the same 

 spot in Surrey for two years running. In this the blue entirely replaces 

 the orange and other markings above the white-edged black spot ; the 

 rest of the upperwing may be either with or without blue. In most 

 of these, eight or ten specimens, no orange scale was visible. 



Nervures. — Two specimens of the brown female, one from Folke- 

 stone, have distinctly paler nervures. Two specimens, one from 

 Folkestone, have grey nervures over the upper wings for the most part. 

 Two or three specimens have nervures largely indicated by blue scaling 

 (Cf. ab. of P. icariit>). 



Measurements. 



Largest. Smallest. 



? s. > 38mm. = (2 examples) \ All in June, 1907, 

 38mm. = (4) I except one in 1904 



37mm. = (1 ab. nigra) \ and one in 1906. 



Mr. Grosvenor's coll. 

 just < 22mm. 



Largest. 



> 39mm. =2 (1 ab. parvipttncta). 

 39mm. = 1 

 38mm. = 4 (1 advanced obsoleta). 



Undersides (series of 98). — I note a recurrent variation in dis- 

 placements of the submedian series of ocelli, observed in 1904, 1905, 

 1906, 1908, and 1909. A remark on one form of this occurs 

 incidentally in the work with reference to a mixed form. This 

 peculiarity is the displacement of the ocelli outwards towards the 

 submarginal row. As a rule they are very fairly constant in position 



