British species of Psyllidce. 553 



Taken by ]\Ir. Douglas and myself somewhat abun- 

 dantly on blackthorn {Prunus spinosus), on INlickleliam 

 Downs in August, and by Dr. Power on the spindle 

 tree {Euonyrmis eiiropaus), near Addington, in October. 

 Dr. Flor has taken it on the common buckthorn (^Rliammis 

 cathai'iicus). 



In the collection of Mr. B. Cooke are two 5 examples 

 of a remarkable variety of this species, in which the elytra 

 are entirely pale, almost white, with only a few fuscous 

 atoms scattered across the middle of the disk, and for 

 which I propose the name albipcnnis. They were taken 

 by him at the same time and place as the others. 



Species 2. Trioza urticcc. 



Chermes Urtica, Lin, F. S. 263, 1006; S. N. ii. 738, 



8 ; De Geer, Mem. iii. 87, 1, t. 9, %. 17—26, and 



t. 10, fig. 1—7; Zett. I. L. 308, ^i^Psj/Ua Urtica, 



Burm. Handb. ii. 08, 3; Psylla eupoda, Hartig, 



Zeits. iii. 374, 8 ; Trioza UrticcB, eupoda, protensa 



vind forcipata, Forst. Verb. Ver. Rlieinl. v. 82, 1, 3, 



4 and 84, 10; Trioza Urtica;, Flor, llhyn. Livl. ii. 



505, 7 ; Trioza bicolor, Meyer, Mitth. schw. ent. 



Ges. iii. 391. 



Fuscous-yellow, yellow, orange, red or black, with 



brown or black streaks on the mesonotum in the first and 



third forms. Face : lobes black ; base more or less broadly 



pale, longer than the crown down the centre. Elytra 



somewhat elongate, clear, transparent or sometimes very 



faintly testaceous ; apex obtuse ; nerves pale yellow ; 



distance of the radius at its base from the costal nerve 



about equal to that from the cubitus. 



Head: crown yellow or dark brown; in the latter case 

 generally with the anterior margin pale or fuscous-yellow ; 

 posterior margin almost straight. Face: lobes black, 

 base more or less broadly yellow, rarely entirely black, or 

 sometimes yellow Avith the apex black, longer than the 

 crown down the centre, acuminate, considerably divergent 

 at the apex. Antennce. black; 2 — 3 joints white, 4th 

 brownish, base white ; 4th barely half the length of the 

 3rd. 



Thorax : pronotum fuscous-yellow or yellow ; meso- 

 notum fuscous-yellow, yellow, orange, red or black ; in the 

 last case with the sides broadly red; in the 1st and 3rd 

 with four brown or black longitudinal streaks on the 



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



