SINODENDRON CYLINDRICUM, L. 53 



together at will ; in a small number of species the movement 

 of the leaves of the antennae is limited or absent. 



There are two Families of Lamellicornia, viz. Lucanid.x and 

 Scarabcneidre, distinguished thus: — 



LucANiD.B (the Stag-Horned Beetles). 



Antennae distinctly kneed, comb-like at the apex ; the 

 apical extensions of the antenna cannot be brought close 

 together. On the underside of the abdomen 5 sternites can 

 be counted. 



ScARAB.EiD.E (the Chafers). 



Antenni^ scarcely kneed ; the leaf-life extensions at the apex 

 can be separated and brought together like the leaves of a book 

 or like a fan ; on the under surface of the abdomen 6 sternites 

 can be counted. 



Family Lucanid.e. 



Key to the three British Genera. 



A. Eyes more or less divided by a groove or channel on the 



side of the head ; antenniie kneed. 



1. The tibiffi of the front legs are without grooves or 



channels (use a lens) on the upper surface {Lucanus 

 cervus)} The larvae of L. cervus live in the stems and 

 roots of decaying broad-leaved trees, e.g. CupulifercC 

 and ash. 



2. The tibiae of the front legs have several grooves on their 



upper surface {Dorcus parallelipipedus). 



B. Eyes not divided ; antennae straight ; head with a small horn 



{Sinodendron cylindricum). 



Key for Larvce. 



In this key, in addition to the Lucanidae larvi^, I include the 

 larvae of three beetles of the Family Scarabaeidae which the 

 forester may find, and which are the likeliest to be confused 

 with the Lucanid species, viz. Melolontha vulgaris, the cock- 

 chafer, Cetonia aurata, the green rose chafer, and Gnorimus 

 Hobilis. The larva of the cockchafer does not live in galleries 



' In July 1909 one of our members, Mr James M 'Galium, sent me this 

 beetle for determination, from Dorset. Mr M 'Galium found the beetle on 

 the road. 



