SYNOPSIS OF THE BRITISH PSOCID.^. 23 



possibly only a peculiar form of some species of Psocus, in 

 which the wings are undeveloped, and to which I have 

 alluded in my introductory remarks ; in Stephens's collection, 

 there stand under this species a pupa and a larva of a species 

 which cannot be more clearly identified. 



B. Wings developed, longer than the abdomen. 

 Genus Psocus, Latr. 



Eyes very prominent, larger and more approximate in the 

 male than in the female; three small ocelli on the crown; 

 antennae IS-jointed, the two large joints more robust; tarsi 

 tri- or bi-articulate ; wings developed, longer than the ab- 

 domen. 



a. Tarsi tri-articulate. 

 Discoidal cell ojjen ; posterior marginal cell elliptical, free. 



4. Ps. IMMUNIS, Steph. 111. 121, 16 (?) ; Ps. longicornis, 

 Steph. Ill, 121, 15 ( ^ ) ; Ps. vitripefinis, Curt. B. 

 E. 648, 28 ; Ps. naso, Ramb. 



Black ; eyes very widely separated ; head black, with 

 yellow spots ; forehead yellow, with black streaks ; 

 antennae as long as the wings, the basal joints yel- 

 lowish ; thorax and abdomen black, spotted with 

 yellow; legs pale yellow, apex of tibiae and tarsi 

 blackish ; wings hyaline, not spotted ; veins brown ; 

 pterostigma elongate-ovate, narrow, brown. 



Female more strongly spotted with yellow ; antennae 

 more broadly yellow at the base, pterostigma pale. 



Length 3 lin. ; exp. 5 Un. 



Hab. Near London, Suffolk, Clifton, Bristol, June 

 and July, common. 



