The remarkable antennae of this insect, which are alike in both 

 sexes, will distinguish it from all others that are related to it ; 

 and the idea that was once entertained of its affinity to Hispa, 

 was a very mistaken notion, which could only have had its 

 origin for want of knowledge of their structure ; for although 

 Sarrotrium is tetramerous, the penultimate joints are not bi- 

 lobed ; the antennae are remote and only ten-jointed, and the 

 trophi are evidently those of Latreille's Heteromera, and in 

 the mandibles we recognise an important character which be- 

 longs to that tribe, an inner margin notched and producing 

 a fleshy lobe. 



The labrum in the specimen dissected is not symmetrica], 

 probably from its having been injured when the insect was 

 first excluded ; but as I had not another that could be spared 

 for the purpose, I was obliged to make use of it. 



Mons. Latreille having adopted Illiger's generic name in 

 his " Families Naturelles," I have only followed him in giving 

 the preference to it, although there is no doubt that Ortho- 

 cerus has the right of priority. 



Sarrotrium muticum is by no means a common insect in this 

 country, although it has been taken in various parts of the 

 kingdom, always in gravel-pits or on sand-hills, generally on 

 the coast ; and it is said to be found at the roots of Peltidea 

 canina (Plate 319). In Norfolk it has been captured by the 

 Rev. T. Skrimshire, near Burnham; and the late Mr. Joseph 

 Hooker met with it in January, on Mousehold heath near 

 Norwich. Mr. Millard discovered it near Swansea, where 

 Mr. Jeffreys has since taken it very plentifully in summer, 

 and Mr. Davis the middle of last April on Crwmlyn Burrows. 

 Mr. Samouelle states that it has been found near Hampstead 

 in June and July; and in the former month Mr. R. Wood of 

 Manchester has met with it at Crosby or Formby near Liver- 

 pool. Mr. Newman also captured 3 or 4 on Blackheath the 

 beginning of last May. 



The plant is Picris {Helminthia Juss.) echioides (Bristly 

 Ox-tongue). 



