British species of PsyllidcB. 537 



appendix blackish. Legs yelloAV or brownish-yellow. 

 Thighs black, apex yellow. Tarsi: 1st and 2nd joints, 

 or the 2nd only, and claws black. 



Abdomen dark brown or black; posterior margin of the 

 segments narrowly reddish or yellow. 



Length 1;^ line. 



The markings on the elytra are a peculiar characteristic 

 of this species. It lives on pear trees, and is to be found 

 from June to October. Of its mode of life, Curtis gives 

 a short account in his B. E. xi. 5Q5, 5. I have only seen 

 old examples taken by the late Mr. J. C. Dale. 



Species 7. Psylla salicicola. 



Psi/lla salicicola, Forst. Verb. Ver. Rheinl. v. 72, 7 ; 

 Flor, Rhyn. Livl. ii. 467, 7 ; Leth. Hem. Nord, ed. 

 ii. 89, 7. 



Green, or yellow intermixed with green, or orange 

 intermixed with streaks of yellowish-white. Face : lobes 

 longish, about equal in length to the crown down the 

 centre ; base very slightly broader than in the middle, 

 where the outer margin runs off obliquely towards the 

 apex, which is more or less broadly rounded. Antennce 

 yellow; 3 — 7 joints black at the apex ; 9 — 10 and some- 

 times the 8th dark brown or black. Elytra clear, trans- 

 parent; nerves, according to the colour of the meso- 

 sternum, pale or dark ; dorsal marginal nerve next the 

 apex of the clavus with a dark brown or black streak ; 

 costal stigma somewhat broad and long. 



Head green or orange. Crown : posterior margin dis- 

 tinctly concave. Pace: lobes longish, about equal in 

 length to the crown down the centre; inner margin almost 

 straight, scarcely diverging ; base very slightly broader 

 than in the middle, where the outer margin nms off 

 obliquely to the apex, Avhich is more or less broadly 

 rounded. AntenncB yellow, reaching to or beyond the 

 base of the stigma; 3 — 7 joints black at the apex, 9 — 10 

 and sometimes the 8th dark brown or black ; 4th about 

 three-fourths the length of the 3rd. 



Thorax : pronotum pale greenish or greenish-white ; 

 mesonotum in yellow examples with the anterior portion 

 more or less pale green ; posterior portion generally with 

 four longitudinal greenish-Avhite lines ; in orange-coloured 

 specimens the anterior portion with a narrow longitudinal 

 central line, and the lateral points pale yelloAvish- white ; 



TRANS. ENT. SOC. 1876. — PART IV. (dEC.) N N 



