British species of PsyllidcE. 533 



Dougla?. It occurs on alders (^Alnus glutinosd) in 

 August. 



Species 3. Psylla spartio])]iila. 



Psylla spartiopliila, Forst. Verb. Ver. liheinl. v. 75, 18; 

 Psylla torifrons, Flor, Kennt. llhyn. 30, 2. 



Orange yellow or somewhat reddish, Avith red-brown 

 streaks on the niesonotum more or less distinct in different 

 individuals. Face: lobes extremely short. Antenn(S 

 yellow or slightly reddish, reaching beyond the apex of 

 the external basal cell; 4th joint, apex broadly black, 

 5 — 10 black. Elytra faintly testaceous, darker towards 

 the apex, transparent ; base generally clear as far as the 

 apex of the external basal cell; nerves yellow; costal 

 stigma almost obsolete, sometimes the nerves are finely 

 dark brown, and apparently very narrowly margined with 

 brownish-testaceous. 



Head orange yellow or reddish. Crown between 

 the eyes more than twice the length down the centre; 

 posterior margin concave, foveas dark brown. Face: lobes 

 very short, about half the length of the crown down the 

 centre ; base very broad ; apex bluntly rounded. AntenncB 

 yellow or slightly reddish, long, reaching beyond the apex 

 of the external basal cell ; 4th joint, apex broadly black, 

 5 — 10 black, 4th about three-quarters the length of the 3rd. 



Thorax: pronotum generally pale yellowish-white, 

 foveas dark brown ; inesonotum orange yellow or reddish, 

 posterior portion Avith a broad yellowish-white stripe 

 down the centre, or with four red-broAvn longitudinal 

 streaks, more or less distinct, or partly or entirely Avanting 

 in different individuals. Elytra faintly testaceous, darker 

 towards the apex, moderately rounded, transparent ; base 

 generally clear as far as the apex of the external basal 

 cell ; nerves yellow, stoutish, sometimes slightly darker 

 toAvards the apex ; distance betAveen the apices of the 

 nerves of the loAver or dorsal bifurcation of the arm of the 

 cubitus almost equal to tAvice the length of the inner 

 branch of the same ; costal stigma almost obsolete. Legs 

 yellow or somcAvhat orange. Tarsi: 2nd joint and c/aiys 

 black. 



Abdomen above generally black, posterior margin of 

 the segments more or less broadly yellow ; $ genital 

 segments yellow ; ]irocesscs long, yellow ; apex broAvn, 

 exteriorly clothed with very short, fine, pale hairs. 



Length 1| line. 



