220 The Inheritance of Wing Colour in Lepidoptera 



were sent to me, and the colour was measured in the usual way. In 

 the other cases, although the colour could not be determined, it is clear 

 from the description whether the insect was a homozygous yellow, but 

 it is not always so clear whether it was a hybrid or a type. In these 

 circumstances the probable constitution of the insect has been indicated 

 by the symbol, and a note of interrogation has been added to show that 

 the question is doubtful. The pedigree of six families of set insects, 

 kindly given to me by Dr Doncaster, has been inset on Table II. 



IV. Description of certain Varieties. 



" As is well known, A. grossulariata is an extraordinarily variable 

 species, and Mr Raynor has named and described a number of its 

 aberrations^ His nomenclature therefore has been used whenever 

 possible, but in two cases I have been reluctantly forced to adopt 

 new names to denote slight variations for which no published name 

 could be found. The following descriptions include all the variations 

 which have been met with in the course of the experiments, but it is 

 by no means a complete list. 



Var. chrysostrota. 



(See Plate IX, Nos. 31 to 42.) This name is given to the variety 

 oi lacticolor, which is entirely suffused with yellow. 



Na.r.flavi- or albipalliata. 



(See Plate IX, Nos. 1, 7 and 19.) The black markings are absent 

 from a broad area between the black basal blotch and the discoidal 

 spot, which gives a white (or yellow) mantle about that area of the 

 insect. This variety only occurred among the parents of my strain, 

 and not much information could be derived from Mr Raynor's records 

 as to the nature of the inheritance of this character. In four families 

 both parents of which were flavi- or albipalliata less than 7 per cent, of 

 the offspring showed the variation. 



Var. fulvapicata. 



(See Plate IX, Nos. 3 and 28.) The orange colour of the central 

 band is continued to the apex of the wing, and the black marking at the 

 apex is obsolete. The incomplete development of the scales at the 

 apex, occasionally the result of inbreeding, may cause a superficial 

 resemblance to this variety. 



^ ''Notes on Abraxas Grossulariata and how to rear it," Entomologist's Record, Vol. xiv. 

 p. 321, 1902 and Vol. xv. p. 8, 1903. 



