540 Mr. John Scott's Monograph of the 



very fine transverse black line before the pale posterior 

 margin ; genital segments yelloNv ; processes yellow ; 

 extreme apex brown. 



Length $ \\, ? U line. 



The sexes are alike in colouring in every respect. It 

 differs from P. pnini in being larger and ])aler than that 

 s])ccies, difterence in the shape of the frontal lobes and 

 colouration of the elytra. 



I have one specimen, taken either at Eltham or Bexley, 

 in May, 1863; and Dr. Power has taken a few specimens 

 at Weybridge on birch {Befula verrucosti). M. Lethierry 

 has seen the msect, and determined it to be his species. 



Species 10. Psyllu pruni. 



Chermes Pnini,'^co^. Ent. Car. 140, 14; Psj/Ud fumi- 

 pennis and Pruni, Forst. Verh. Ver. Kheinl. v. 76, 

 22, and 77, 23; Flor, Kennt. lihyn. 40, 8. 



Dark red, somewhat dusky. Face: lobes shorter than 

 the crown down the centre ; base broad, exterior margin 

 sloping to the somewhat narrow apex more rapidly than 

 the inner one, divergence moderate. Antennce short, 

 bro^\mish-yellow ; 5 — 6 joints at the apex very narrowly 

 black, 9 — 10 black. Elt/tra semitransparent, brown, ex- 

 ternal basal cell pale ; costal stigma wide, long, gradually 

 tapering from the base to the apex. 



Head dark red. Croicn : posterior margin slightly 

 concave. Face : lobes dark red, shorter than the crown 

 down the centre; base broad, exterior margin sloping to 

 the somewhat narrow apex more rapidly than the inner 

 one, divergence moderate. Antennce short, brownish-yel- 

 low, reaching to or a little beyond the middle of the external 

 basal cell, 5 — 6 joints at the apex very narrowly black, 

 9 — 10 black ; 4th about three-fourths the length of the 3rd. 



Thorax: pro- and meso-notiun dark red, somewhat dusky. 

 Elytra semitransparent, brown, external basal cell pale ; 

 nerves stout ; costal stigma wide, long, gradually taj^ering 

 from the base to the apex. Legs brownish-yellow. Thighs 

 black, apex brownish-yellow. Tihice brownish-yellow, 

 apex sometimes darker. 



Abdomen black, side margins narrowly red. 



Length 1:1^ line barely. 



Apparently a very scarce species, as I have only seen a 

 specimen taken by Dr. Power at Esher, May 19th. It 

 is said by Forster to live on the black thorn {Primus 

 spinas a). 



