ID0L0C0RIDJ3. 369 



upon the disk ; remaining portion pitchy black, apex piceous ; disk 

 pale piceous, palest iu the centre ; Ciineus broadly yellow at the 

 base, apex and inner margin narrowly yellow ; Memhrane blackish, 

 iridescent ; a narrow white streak extends from under the apex of 

 the cells and below the inner margin of the cuneus to the anterior 

 margin, and below the latter a large, triangular dark patch extends 

 to the apex ; inner marginal nerve black at the base ; cell-nerves 

 pitchy black, apex white. Legs yellow ; 3rd pair sometimes reddish- 

 yellow ; thighs at the base yellowish-white, on the upperside with a 

 brownish streak ; tibice ; 3rd pair sometimes piceous at the apex ; 

 tarsi brown. 



Abdomen underneath brown or blaclv. 



Length, 3i lines. 



The following variety of the $ is frequently met wdth : — Pro- 

 notum yellow, callosities black. Elytra orange-yellow, somewhat 

 diaphanous ; Clavus ; between the nerve and the suture white ; 

 Corium ; anterior margin and a broad streak next the claval suture, 

 white ; Cuneus pale yellowish-white, margins orange-yellow ; Mem- 

 brane pale ; cell-nerves yellowish-white. 



Abdomen underneath brown, sides and apex more or less yellow. 



All the other characters as in the foregoing description. 



This is a very common species on birch trees, in June and 

 July. "We have taken it at Darenth Wood and other places in the 

 London district. 



Genus 2. — Systellonotus, Fieb. 

 Elongate, narrow. Elytra contracted before the middle. 



Head vertical in front, a little wider across the eyes than long ; 

 transversely oval, but posteriorly produced into a neck, and dis- 

 tinctly narrowed ; Crown flattish, slightly raised above the upper 

 margin of the eyes and deflected to the base of tlie clypeus ; Clypeus 

 convex ; base in a line with the anterior margin of the eyes ; apex 

 produced, and with the short antenniferous processes in a line with 

 the middle of the lower half of the eyes ; Face long, pointed ; cen- 

 tral lobe long, narrow, convex, prominent ; side lobes short, narrow, 

 somewhat parallel. Antennce almost as long as the body ; 1st joint 

 cylindrical, shorter than the head ; 2nd somewhat stout, 3 times 

 longer than the 1st ; 4th frds the length of the 3rd. Eyes large, 



2J. 



