﻿THE GENUS ITHYSIA. 



819 



The point of the uncus is very short. The gnathos is much 

 narrower than that of alpina, and instead of being indented at 

 the base proceeds outward in a straight hne until the curved 

 extremity is reached. It is much more strongly squamous than 

 in alpina. In general shape it is not unlike some forms of the 

 shells of the genus Pccten. The cedeagus is short and stout, 

 and the vesica is merely thickened where the cornuti ought to 

 be, for they are absent. The eighth abdominal tergite is not 

 thickened. 



I. iTALiCA var. FLORENTiNA (Stef. nec GRiECARiA, Bdv.-Staud.). 

 — In this form the ground colour is strongly suffused with light 

 brown, whilst the markings and suffusions are much stronger 

 than in the type. The thorax is quite brown. 



I. ITALICA var. CARNioLicA, nov. — In this variety the ground 

 colour is grey heavily suffused with blackish scales, whilst the 

 markings and suffusions are colder in tone and much stronger 

 than in the type. The thorax is dark grey. 



I. GR^CARiA (Bdv.-Staudinger). — This species was erected by 

 Staudinger definitely in 1870, as Boisduval's name was without 

 definite description, although proposed in 1810. 



The ground colour of the wings is a dead grey, slightly mixed 

 with yellow or brownish scales in the type, and in this deadness 

 of the colour we have a contrast to the gloss of alpina and italica. 

 The yellowness of the ground is stronger in the hind wings. On 

 the fore wings the first, median and second lines are all present, 

 as well as the subterminal band. The median line is very near 

 the second one, which, at the fifth vein, takes a rapid inward 

 sweep to strike the costa nearly at right angles. The sub- 

 terminal white band has both of the usual suffusions, and is 

 broader and less prone to be scalloped than in the other two 

 species. The markings on the hind wings have the same 

 characteristics. Both the suffusions and the lines on all the 

 wings are more line-like than in the other species, and this 

 character in the second line of the hind wings is very important. 

 The veins are not outlined in black or brown. 



The shape of the wings in this species is quite different from 

 that of alpina and italica, for the fore wings, in proportion to the 

 hind wings, are much shorter. In the hind wings the inner 

 margin is not markedly less than the costal margin, so that the 

 upper angle of the wing does not project as far as in italica, but 

 is even rounded and turned in toward the base. The termen of 

 the fore wings, too, is more rounded than in italica. 



The thorax is grey, slightly brown mixed, and is not very 

 broad, whilst the abdomen is brown with paler hairs. The 

 antennae are shorter than those of italica, and, while more 

 strongly pectinated than those of alpina, are less strongly so 

 than in italica. The pectinations, too, are thinner. The 



