PSITHYRUS QUADRICOLOR 219 



The 3rd and 5th joints of the antennae 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 B. jonelhis. 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 is a species closely 

 related to Ps. quadricolor named globosus. This 

 species is parasitic on B. soroensis, and it is possible 

 that it may be found in Britain when the haunts of 

 B. soroensis are better known. In size and structure 

 Ps. globosus closely resembles Ps. qtiadricolor, but the 

 colouring of the coat is like that of Ps. rupestris. 



