British species of Psyllidce. 539 



curved, more remote; In dark examples these are some- 

 times almost obsolete. Elytra with an extremely faint 

 testaceous tinge, transparent; nerves fine, pale or dark 

 brown ; costal stigma wide, long. Legs yellowish or red- 

 dish, or brownish-yellow. Thiphs pitchy brown; apex 

 pale or frequently reddish, with a pitchy-black line on 

 the inside near the upper margin. Tarsi: 2nd joint and 

 dates brown. 



Abdomen, in pale examples, bright green or reddish- 

 yellow ; in dark ones black ; side margins narrowly bright 

 red. 



Length 1^ line barely. 



Extremely variable in colour on the body ; and according 

 to the colour there, so are all the other portions of the 

 insect. 



Mr. Douglas has taken it somewhat commonly on 

 Scotch fir {Pinus sylvestris), and Dr. Power has also met 

 with it at Holm Bush, iSIickleham, &c., from May to 

 November. 



Species 9. Psylla sylvicola. 



Psylla sylvicola, Leth. Hem. Nord, ed. ii. 90, 11 (1). 



Orange yellow. Face : lobes about as long as the crown 

 down the centre ; apex narrow ; divergence less than the 

 base of either of them. Antenn(B somewhat short,- not 

 reaching to the base of the stigma; 3 — 7 black at the 

 apex; 8 — 10 black. Elytra: pale brownish-testaceous, 

 transparent; nerves yelloAv, somewhat fine: costal stigma 

 wide, gradually tapering to the apex. 



Head orange yellow. Croicn : posterior margin con- 

 cave. Face: lobes orange yellow, or sometimes pale 

 green, abovit as long as the crown down the centre ; base 

 somewhat broad ; exterior and interior margin sloping 

 gradually to the narrow apex; divergence at the latter 

 less than the base of either of them. Antenna somewhat 

 short, not reaching to the base of the stigma ; 3 — 7 at 

 the apex black; 8 — 10 black; 4 — 5 together a little 

 longer than the 3rd. 



Thorax : pro- and meso-notum orange yellow, without 

 paler or darker streaks. 



Elytra pale brownish-testaceous, transparent; nerves 

 yellow, somewhat fine ; costal stigma wide, gradually 

 tapering to the apex. Legs testaceous. Tarsi : 2nd 

 joint and sometimes the 1st also brown. Claics brown. 



Abdomen above yellow; S foxu- basal segments with a 



N N 2 



