Didea. 253 



pairs of pale greenish or greenish yellow spots (by the exsiccation 

 they often become more yellow); the first pair are oblique, they are 

 rounded inwards and stretch from here upwards to the side margin, 

 over which they extend; the second pair are connected in the middle, 



Fig. 114. Antenna of D. alneti $, from the inside. X 55. 



thus forming a band, lying close to the front margin and deeply ex- 

 cised behind; it occupies aboiit half the length of the segment; the 

 third pair of spots are cuneiform with the base outwards and the 

 apex towards the middle; they lie close to the front margin of the 

 segment and the hind margin slopes forwards from the base to the 

 apex; the second and third pairs are separated from the side margin; 

 the dull space on the fourth segment forms two oblique spots just 

 behind and along the yellow spots and connected with the dull side margin. 

 Abdomen is clothed with somewhat short, erect hairs, on the hind 

 parts of the segments they are quite short and depressed, they foUow 

 mainly the ground colour; at the side margin the hairs are all black 

 except on the basal spots, where they are white and long, and they 

 are also pale at the basal corners of the fifth segment. Genitalia 

 (eighth segment) bluish shining, but grey pruinose on the left side; 

 they are covered with longish, pale hairs. Venter pale yellow on the 

 basal half, with three velvet black spots on the second and a trans- 

 verse band on the third segment at the hind margin; the fourth seg- 

 ment bluish, with a black band at the hind margin; the venter has 

 long hairs, pale on the basal part, dark on the apical part, Anterior 

 legs reddish, the basal part of femora black, tibiæ with a more or 

 less distinct, dark ring below the middle, tarsi black; hind legs black 

 with the apex of the femora and the basal part of the tibiæ reddish. 

 The legs haired as usual, the hairs black, on anterior tibiæ mixed 

 with yellow hairs; on the anterior femora the hairs dense, but on 

 hind femora they are only few; hind tibiæ with a short fringe above 



