532 ]\rr. John Scott's Moiioi/rapli of the 



it may be (Hstinn;uis1ied l>y tlie want of tlic black spot at 

 the base of the tibia^ and the faintly-coloui-od elytra, as well 

 as the difference in the form of the o-onitalia. 



Exceedin<>;ly abundant on alders [Alnus f/lntinosd), from 

 June to the end of October. 



Species 2. Psf/Ila nhii. 



Chcnnes Alni, Lin. F. S. 2G2, 1008; S. N. ii. 738, 10; 

 Fab. E. S. iv. 222, 12; Scop. Ent. Carn. 140, 417; 

 De Geer, Mem. iii. 96, 3, t. 10, fig. 8 ; Psijlla Alni, 

 Burrn. Ildb. ii. 98, 1; Flor, Khyn. Livl. i'i. 460, 3; 

 Loth. Hem. Nord, ed. ii. 90,8; Psj/lla fiiscincrvis 

 and Heijdcni, Forst. Verii. Ver. llheinl. v. 20, 2 & 

 81, 32. 



Green, yellowish, red or reddish. Face: lo1)es short, 

 stumpy, conical, diverging" toAvards the apex. JMcsonntiim 

 frequently with two longitudinal, oval, light or dark-brown 

 ]iatches on the posterior portion ; costal stigma narrow, 

 somewhat short. Tihicc with a small black spot exteriorly 

 at the base. 



Head: face, lobes conical, short, stumpy, base broad, 

 about equal to the length, divergence at the apex about 

 equal to the base of either. Antenna', yellow, I'caching almost 

 to the base of the stigma; 1st joint broadly black at the 

 base, 3 — 7 brown at the apex, 8 — 10 brown, 3rd and 7tli 

 almost equal in length, 4 — 6 subcqual. 



Thorax: mesonotum in yellow or green examples with 

 or without two light-brown, oval patches on the posterior 

 ])ortion ; in red or reddish cxam])les these characters are 

 darker. Khjtra. clear, transparent or slightly dinnned, as 

 if having been breathed upon; nerves dark broAvn or 

 black from the base of the cubitus to the apex; costal 

 nerve bright green, ciliate, the hairs very minute; stigma 

 green, narrow, somewhat short. Leys yellowish or green. 

 Tliighs: 1st and 2nd pairs frequently with a short, 

 more or less distinct, brown streak on the iqiper side 

 before the apex. Tibia with a small black spot exteriorly 

 at the base. 



Abdomen generally green. 



Length 2^ lines. 



One of the largest European species and most easily 

 recognized by the black spot on the tibia?. 



Not common. The only examples I have seen, in 

 addition to my own, wore taken by Di-. Power and Mr. 



