552 INIr. John Scott's Monograph of the 



lets, the cubitus Avitliout a petiole, and the short antenna', 

 snthciently indicate the difference between this genus and 

 that of Psi/lla. 



Species 1. Trioza Walkeri. 



Trioza Walkeri, Forst. Verb. Ver. liheinl. v. 88, 23 ; 

 Flor, Rhyn. Livl. ii. 496, 1. 



Long and narrow, entirely brown, or more frequently 

 with a more or less inten-uptcd white band across the 

 middle of the elytra, and before the apex a somewhat 

 triangular white patch. 



Head pale or dark brown, clothed with short, serai- 

 erect pale hairs. Croion less deflected than ordinary. 

 Face : lobes dark broAvn, not so long as the crown down 

 the centre ; base broad ; apex stumpy ; exterior margin 

 convex, only slightly divergent at the apex. Antennee 

 yelloAv ; 1st joint entirely, 2nd at the base dark brown ; 4tli 

 and 6th, apex narrowly black ; 9 — 10, or sometimes 8 — 10, 

 black, 4th about three-fourths the length of the 3rd. 



Thorax : j)ronotum generally pale broAvn ; mesonoUim 

 dark brown, clothed with short, semi-erect, pale hairs; 

 anterior portion generally with a central longitudinal line, 

 and the lateral margins pale ; posterior portion with four 

 pale longitudinal lines, placed one on each side of the 

 centre, somewhat broad, and one narroAver, a little more 

 remote. Elytra brown, semi-transparent, Avrinkled trans- 

 versely, and thickly powdered with dark-brown atoms; 

 across the middle a more or less interrupted irregular 

 white band, very broad on the costal margin, sometimes 

 almost obsolete betw^een the radius and cubitus, but always 

 distinct between the nerves adjoining the apex of the 

 claviis, sometimes the entire elytra are brown ; costal 

 margin very convex from the base to almost the apex of 

 the radius, where it is suddenly cut oft" obliquely to the 

 acute apex, before which is a somewhat triangular white 

 patch. Legs yellow. Tiiighs generally dark brown at 

 the base. Tarsi: 2nd joint sometimes at the apex red, 

 Claics brown. 



Ahdoynen above black ; posterior margin of the seg- 

 ments very narrowly and sides red. 



Length 1| — 2 lines. 



The colour and peculiar manner in which the costal 

 margin is rut oft' towards the apex is sufficient to separate 

 the above from all other species. 



