546 INIr. John Scott's Monograph of the 



in front and forming a n-!^li«ipod character. Elytra clear, 

 transparent ; nerves fine, pale yellow, except where they are 

 intercepted by the fuscous-black mai-kings, when they 

 become black; costal sti«;ma moderate, its inner nerve very 

 finely margined with black exteriorly; dorsal margin at 

 the base with a short black streak, from thence to the apex 

 of the clavus yellow, nerve adjoining the latter margined 

 with fuscous-black on each side ; round the apex a broad, 

 irregular fuscous-black band, frequently more or less 

 interrupted or entirely wanting. Wings clear, transparent ; 

 dorsal margin at the base fuscous-black. Legs yellow. 

 Thighs with a black line along the u|)per margin. Tarsi: 

 2nd joint at the apex and claws black. 



Abdomen black ; })ostcrior margin of the segments more 

 or less bi'oadly yellow. 



Length li line. 



Unlike any other species kno^^^l to me in its markings. 



A common species on ash-trees {Fraxinus excelsior) 

 from June to September. 



Species 17. Psylla ferruginea. 



Psylla ferruginea, Forst. Verli. Ver. Rheinl. v. 79,29. 



Reddish or pale brownish-red, Avith dark red-brown 

 streaks on the mesonotum. Face : lobes nearly as long as 

 the crown down the centre; base broad, exterior and inner 

 margin sloping to the somewhat stumpy apex, where the 

 divergence is about equal to half the base of either of them. 

 Antenn(syc)Xo\\ ; 4 — 7 joints black at the apex, 8th obscure, 

 9 — 10 black. Elytra clear, transj^arent, nerves and costal 

 stigma clear chocolate-brown ; apex of the nerves and the 

 spaces enclosed by them on the pale dorsal margin to 

 round the apex with dark-brown spots. 



//mr/ reddish. Crown: posterior margin concave. Face: 

 lobes dark red, nearly as long as the head, sparingly clothed 

 with pale hairs, base broad, exterior and inner margin 

 sloping to the somewhat stumpy apex, the latter when seen 

 from the side is more acuminate; divergence at the apex 

 about equal to half the base of either of them. AntenncB 

 yellow, reaching to the base of the stigma ; 4 — 7 joints 

 black at the apex, 8th obscure, 9 — 10 black, 4th about 

 two-thirds the length of the 3rd. 



Thorax: pro- and meso-notum pale brownish-i"ed ; poste- 

 rior ])ortion of the latter with four dark I'cd-brown, longi- 

 tudinal streaks, the two interior somewhat oval in shape. 

 Elytra clear, transparent, nerves and costal stigma gene- 



