30 THE entomologist's record. 



compHred with the description on p. 177, quite a faihire. The artist 

 does not give a light-grey variety but one with hght reddish-grey 

 ground colour, as Wernebarg remarks in his Beitrdgen zur SchinetterUn(/s- 

 kunde, vol. ii. (1864), p. 22. They belong to quite different groups of 

 A. populi, the one corresponding with the description belongs to the 

 cinerea group, the other corresponding with the figure to the 

 ferriii/inea group. In my " Uebersicht der von E. Busack bei Schwerin 

 und Waren gefangenen Gross- Schmett." {Archiv d. Ver. d. Fr. d. 

 Naturg. in Meckl., vol. 58, 1904, p. 69), I called the first form trevndae 

 Borkh. (the mark "«5." is missing by mistake), the second form ab. 

 fi>,rrn<jinea, Gillmer. One cannot find out exactly which of the two 

 corresponds with Jung's specimen, the one described by Esper or the 

 one painted at his command." ISorkhausen does not seem to have 

 noticed the contradiction existing between Esper 's description and 

 the painting. He follows the description and does not seem to have 

 considered the figure. Koch (1856) was the first who drew attention to 

 the difference between the two. On p. 62 of his work [Schmett. d. 

 iiildirestl. Deutschlands), he says that Esper has given a far too reddish- 

 coloured figure whilst describing the aberration as being of a light- 

 grey colour. Even Koch prefers the description to the figure. The 

 following is my description of Esper's figure : 



The upperside of the forewing is of a reddish-grey ground colour, nervures and 

 hind margin brown. The hindwing shows a yellow-grey ground colour, the basal 

 spot is of a slight rusty-red tint, nervures and margin are brown, whilst the cells 

 between the nervures appear slight grey-blue. On the underside, the f Brewing is 

 yellow-greyish the cells between the nervures are violet-grey, the nervures, margin 

 and costa brown, whilst the underside of the hindwing shows a light brownish- 

 yellow ground colour and greyish tinged cells between the nervures. The thorax 

 above light yellow-brownish with a bluish-grey shading ; the light-brown abdomen 

 shows dark-brown shading ; antennse yellow-brown. 



It is therefore a reddish-yellow form with a slight lavender-blue 

 tinge, which in my opinion belongs to the ferruginea group. 



In his Xaturgeschichte d. europ. Schmett., ii., p. 181, and in his 

 RJieiniscJies Magazin, p. 649, Borkhausen does not say anything new 

 respecting the description of Esper's aberration ; but, yet, he still 

 tries to support the staggering opinion of its distinctness by the 

 quotation of certain data relating to the caterpillar (half size, slender 

 figure, only living on aspens), and names this so-called aberration Sphinx 

 tremulae, but Ochsenheimer has definitely cast aside this opinion in 

 the second volume of his Schmett. von Europa (1808), p. 254, 

 Meigen also does not mention anything new of this aberration of 

 Esper in his System.. Beschr. der europ. Schmett., vol ii. (1830), 

 p. 150 ; nor do we observe anything of importance in his lithograph 

 copy. 



In 1853, Dr. L. Glaser describes, in his " Schmett. des Grossherzog- 

 thums Hessen " (Berichte der Oberhess. Ges. f. Natur-und Heilkunde, 3 

 Ber., i853, p. 53), a new form of A. populi as var. tremulae, Borkh., 

 which is " smaller, lighter than populi, white-grey mixed with a weak 

 rusty -yellow colour," and which often appears as a constant variety of 



* As far as I was able to find out, the collection of Jung (died 1816) fell 

 into the hands of a certain Mr. Kramer in Uffenheim. This gentleman divided 

 the collection between schoolboys, as his son, banker Ottomar Ertemer, wrote 



