554 Mr. John Srott's 3Ioiior/rn]ih vf the 



posterior portion, placed one in a line with each extremity 

 of the scutellifonn process, and another generally broader 

 than the last nearer the lateral margin. Eli/tra some- 

 what elongate, cleai*, transpai'ent, or sometimes very 

 faintly testaceons ; apex obtuse or sometimes bluntly 

 rounded ; nerves ]mle yellow ; radius at the base about 

 equidistant from the costal margin and the cubitus, its 

 apical half slightly convex towards the anterior margin. 

 jA'gs fuscous-yellow. TliUjlia yellow, with a broad black 

 longitudinal line somewhat on the inside, near the upper 

 margin, generally extending to the a])ex. TibicB : apex 

 fi"equently brown. Tarsi and claws pitchy brown. 



Abdomen above bro^^ii or black, posterior mai'gin of 

 the segments narrowly greenish or jellowisli-green ; be- 

 neath generally green. 



Length 1;^ — 1| line. 



Var. bicolor, Meyer-Dlir. Head and thorax deep 

 yellow. Abdomen green ; all the other characters as 

 above. Types in my possession. 



Allied to T. albiventris, from which it may be recog- 

 nized by the difference in colour and divergence of the 

 flice-lobes, and more particularly by the radius, Avhich is 

 almost one-half iiu'thcr distant from the costal nerve. 



Perhaps the most common and variable species of the 

 genus, and may be swept from nettles {Urtica dioica, &,-c.) 

 from May to October. 



Species 3. Trioza viridula. 



Chermes viridula, Zett. I. L. 309, 7 ; Psylla simplex, 

 Hartig, Zeits. iii. 374, 6 ? Trioza apicalis, Forst. 

 Verh. Ver. Rheinl. v. 82, 2 ; Trioza viridula, Flor, 

 llhyn. Livl. ii. 499, 3. 



Pale green. Elytra clear, with a glassy or crystalline 

 transparence. 



Head pale green. Face : lobes at the apex brown or 

 black, shorter than the crown down the centre, moderately 

 divergent; apex acuminate. Antennoi v;\\\i\%\\ or yellowish- 

 white ; apex of the 8th joint and 9 — 10 entirely black ; 

 3rd twice as long as the 4th. 



Thorax pale green. Elytra clear, Avitli a glassy or 

 crystal transparence ; costal margin convex, somewhat 

 abruptly cur\ed from and at the greatest breadth of the 

 corium, which lies a little before the apex of the radius, to 

 the stumpy, almost acute apex ; nerves clear. J.egs pale 



