1865.] 207 



A. Elytra not pubescent. 



1. Thorax not contracted before the anterior mar- 

 gin, which is not elevated. 



* Thorax perceptibly longer than its breadth in 



the middle (no British species.) 



** Thorax of the same length as, or shorter 



than, its breadth flavescens. 



2. Thorax having a slight contraction before the an- 

 terior margin, which consequently appears elevated. 



* Forehead and rostrum level, with a longitudi- 

 nal furrow in the middle. Elytra with golden 



or green bands suturalis. 



B. Elytra with rather long pubescence. Forehead with 

 a pit-like excavation, the eyes thereby becoming promi- 

 nent SULCIFKONS. 



Seconb GrROUP. — Thorax very slightly dilated at its sides, which 

 are often nearly straight ; elytra more level on the upper side than in 

 the first group, elongate, and more jjarallel at the sides. Eyes rather 

 prominent. 



A. Insects clothed above with short, silky, depressed pu- 

 bescence. 



1. Sides of the elytra parallel. 



* Forehead level ; and, with the rostrum, scarcely 

 furrowed. Thorax and elytra rather finely 

 punctured tiblilis. 



2. Elytra narrower at the base than in the middle. 



* Forehead rather convex, rostrum furrowed. 



Thorax broader at the base than at the apex ...lineellus. 



B. Hinder part of the elytra set with small erect bristles, 

 of which the majority are white, and planted in series on 

 the interstices. 



1. Interstices convex, unequal Waterhousei. 



2. Interstices level. 



* Colour very pale. 



a. Head and thorax rather strongly punc- 

 tured CRINITUS. 



Thied Group. — Thorax very rounded at the sides ; eyes very 

 prominent. 



A. Elytra very broad, and broader behind than in front. 



1. Elytra not pubescent (no British species.) 



2. Elytra with bristles I'ather long, especially behind. 



* Legs entirely red (no British species.) 



** Femora black regensteinensis. 



B. Elytra with the sides almost parallel, and the ex- 

 tremity regularly rounded. 



1. Vertex of head unifonn. 



* Elytra with scattered pubescence ; black, 



spotted with grey or brown CAMBRicus. 



2. Vertex with two httle rounded elevations, formed 

 of yellow hairs (no British species.) 



