1890.] 



THE YOUNG NATURALIST. 



23 



anticis ochroleucis, nebulis aliquot saturatioribus. Expansio alarum 

 I unc. Alae anticae bifidae : posticae tripartitae fusco-ochraceae " 

 (" Lepidoptera Britannica," p. 478). I have used the name bertrami 

 throughout my description, die, as it would appear to be ridiculous 

 not to use so well-known a name in these papers, which are essentially 

 to bring our actual knowledge up to date. I shall however, have 

 more to say of this synonymy later. 



Imago — This is a paler and less strongly marked species than the 

 last, the apex of the anterior wing in the male angular, as in gonodac- 

 tyla, in the female more pointed. The markings are almost identical 

 in position with those of the last, but much less intense in depth of 

 colour. Stainton describes it, under the name of ochrodactylus in the 

 " Manual" p. 440 as :-"(i" — 1". 1"') F-w. ochreous, slightly clouded with 

 darker, especially along the costa ; the tip of the anterior lobe produced, 

 pointed." " Larva in shoots of yarrow." Mr. Stainton also says :- 

 "Anterior wings less falcate than in dichrodactylus ; the tibiae are 

 slightly browned, but the tarsi are spotless whitish " (" Entomologist's 

 Monthly Magazine," Vol. II., p. 138). Heinemann says of this species:- 

 " Very close to the former species, but the fore- wings less sharply 

 pointed, all the brownish -red dusting paler, the spots before the 

 division pale, often entirely wanting, the lines at the hind border finer ; 

 on the third feather of the hind-wing the black scales behind the 

 middle are either less or wanting. The legs are yellowish-white, the 

 tibiae of the fore-legs are brown at the end, in the hind tibiae the red- 

 dish-brown colour is equally spread from the middle to the end" (" Die 

 Schmetterlinge Deutschlands," clc, Vol. II., p. 784) Mr. Sang writes of 

 bertrami ; — " the colour of Bertrami is shades of fawn-colour and brown, 

 the darker shades indistinctly margined, mere washes of colour, not 

 sharply laid on like those of dichrodactyla. The spot near the fissure, 

 when present at all, is exceedingly faint." "The hooked apex, which 

 in some specimens of Bertrami — probably females — is well marked, 

 will be found on close examination, to have a different shape in the 

 two insects. In dichrodactyla the hook is much more emarginate 

 on the lower side, so that it comes to a much finer point than in 

 Bertrami " ("Entomologist's Monthly Magazine," Vol. XVIII., p. 144). 



Time op Appearance — This species is, in a state of nature, 

 much earlier than the last. I have taken it from June 26th to July 

 16th, in different years. It occurred at Maidenhead on June 26th. 

 1889, at Deal on July 4th. 1883, at Westcombe Park, from July 



