British species of Psyllida. 541 



Species 1 1 . Psijlla Lowii. 

 Red or somewhat brownish-red, generally with pale 

 streaks on the mesonotum. Face: lobes as long as the 

 crown down the centre ; base broad, rapidly narrowing to 

 the middle, from thence to the apex almost parallel, where 

 they become somewhat divergent. AntenncB short, baiely 

 reaching to the base of the stigma. Elytra smoky testa- 

 ceous, ov almost clear, transparent; neiwes, m fresh ex- 

 amples, yellow, inclining to orange, m o^l^^f/^^^.^^^^"' 

 sti-ma moderate, almost regularly narrowed from the base 

 to the apex; upper arm of the cubitus long, very convex 



Head: c;..^ red, posterior margm distinctly concave. 

 Face: lobes reddish or yellowish; base broad, rapidly 

 narrowing to the middle, from thence to the apex almost 

 r)arallel- apex rounded or slightly acute, somewhat di- 

 ^™t. l.^..n« reddish-yellow, short, barely reachmg 

 to the base of the stigma; 3rd joint short, scarcely 1^^^^^^^^^ 

 than the 1st and 2nd together; 4th about four -fifths ot 

 the 3rd; Istfi-equently black, or base of 1-2 black; 4-8 

 at the apex narroAvly brown ; 9— 10 black. 



Thorax: pronoLn generally yellowish; mesonotum 

 red or brownish-red; in the latter case the posterior por- 

 tion with four slightly indistinct pale longitudinal Imes, 

 the t^" exterior curvfng round and enclosmg the inner, 

 which are on each side of the centre. Elytra smoky tes- 

 taceous, or almost clear, transparent; greatest breadth 

 S?e he apex of the stigma, length equal to abou two 

 and a half times the breadth ; nerves yellow, inclining o 

 orange or dark brown ; stigma moderate, almost regulai4y 

 narrowed from the base to the apex ; upper arm ol the 

 cXus long, twice the length of tl- />ifurca ion, very 

 convex and approaching the base of the radius. Legs 

 leddish-yellow!' r/.^A.: 3rd i^air sometimes brown at 

 the base. TihicB yellowish. Tarsi: apex of the 2nd 

 ioint very narrowly and claios dark brown. 

 ^ Abdoler. above, in both sexes, deep pitchy-brown 

 shinino- ; posterior margin of the segments very narroAjdy 

 red or^^metimes the $ ?eddish, with a daij. band across the 

 segments; ^ genitalia pale chestnut ; ? frequently green. 

 ^Leno-th 14- — iHine nearly. , . • r at 



T^ken abundantly by Mr. Douglas beginning o| No- 

 vember, at Addington, on fir and birch, and by Dr Fo^^ei 

 [n February, at Esher. The latter are, no doubt, over- 

 wintered examples. 



