VIII PSIPAYRUS QUADRICOLOR 219 
The 3rd and 5th joints of the antenne are almost 
equal; the 4th is about two-thirds as long as the 5th. 
Length of flagellum 5 mm. 
Armature distinct. 
Parasitic on B. pratorum, and also, according to 
some authors, on L. jonellus. It is widely distri- 
buted, but does not appear to be common in many 
places. At Ripple it is rare. It appears early, the 
females in April and the males in June and July; 
the latter are fond of the flowers of the raspberry. 
In Ireland it has been taken by Mr. Freke at 
Borris, Co. Carlow. 
On the Continent, in addition to the six species of 
Psithyrus found in Britain, there its a species closely 
related to Ps. guadricolor named globosus. This 
species is parasitic on B. sovoénszs, and it is possible 
that it may be found in Britain when the haunts of 
LB. soroénsis are better known. In size and structure 
Ps. globosus closely resembles Ps. guadricolor, but the 
colouring of the coat is like that of Ps. raupestres. 
