TRiciioriiYA. 233 



yellow-ltvoM'ii. Head triiuigular, thorax twice as broad as 

 long. L. 1^ 1. Not uiicommou. T. jnlicornis, Gjll. 



Comirus. 



A. Length 2 lines. 



(I. Elytra black-hrown, with a red-yellow spot at Ijase. 



Black-brown ; posterior angles of thorax, an oblique spot 

 at base of each elytron, base and apex of antennae and the 

 legs red- yellow ; margins of abdominal segments red- 

 brown. Punctuation extremely close and fine ; posterior 

 angles of thorax sharp right angles, somewhat prominent ; 

 elytra half as long again as thorax ; penultimate joints of 

 antennae distinctly longer than broad. Common. 



C. littoreus, Lin. 



h. Elytra unicolorous black-brown or dark red-brown. 



Black-brown ; elytra sometimes dark red-brown ; basal 

 margin of tliorax and margins of abdominal segments red- 

 brown ; base and apex of antennae and the legs red-yellow. 

 Punctuation not so close as in C. littoreus ; sides of thorax 

 more strongly rounded ; elytra one-third longer than thorax ; 

 penultimate joints of antennae scarcely longer than broad. 

 Conmion. G. pithescens, Gr. 



J?. Length 1 — 1| line. 



(I, Elytra unicolorous. 



I. Elytra distinctly longer than thorax. 



1. Thorax black-brown. 



Similar in form, colour and punctuation to 0. 2yuhescens, 

 but with penultimate joints of antennae generally distinctly 

 broader than long and posterior angles of thorax rather more 

 pointed and more strongly produced. L. 1| 1. Eather 

 common. C. iiiimacidatiis, Steph. 



2. Thorax yellow-brown. 



Unicolorous yellow-brown. Punctuation as in G. 2mlicu- 



lariiis, but antennae rather more slender, posterior angles of 



thorax less distinctly prominent and elytra distinctly longer. 



L. 1 1. Common. G. livid us, Er. 



II. Elytra almost shorter than thorax. 



Pitch-black ; posterior margin of thorax, the elytra and 

 margins of abdominal segments generally red-brown ; an- 



