52 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



a brown-yellow line is seen to run from each side of the head 

 down the first segment. 



By aid of a lens a spiracle is seen on each side of the first 

 segment, and spiracles on body-rings 4 to 1 1 inclusive. Very 

 characteristic is the view of the hind face of the last segment of 

 the body (using a lens) ; the anal vent is longitudinal in 

 direction, and is flanked on each side by a bulging oval lobe, 

 while above there is a small lobe. 



Dorcns parallelipipedns, L. 



This beetle is very close in relationship to Sifiodendron and 

 Lucanus (the stag-horned beetle), it has similar habits, and 

 is found in broken and decaying stems of ash and elm. It 

 does not occur in Scotland. In January 1914 a member of 

 the Royal Scottish Arboricultural Society sent me, from 

 Lincolnshire, Dorcus and its larvae taken " in large numbers 

 in the decayed heart of an old ash tree." Along with them 

 were found specimens of the ground beetle, Pterostichus vulgaris. 

 Again, in July of this year, Mr Charles Bruce, another of our 

 members, sent me from Oxfordshire for determination a handsome 

 live Dorcus taken from a somewhat decayed walnut tree. 



Lamellicorn Beetles. 



As an assistance to others who may meet with these species, 

 I give below the chief characters of the division of beetles^ 

 to which Lucanus and Dorcus and Sinodetidron belong, and of 

 their larvae.- In the key to the larvs I include some allied 

 species likely to be met with and to be confused. 



Lamellicornia is a division of beetles characterised by 

 a five-jointed tarsus ; antennae kneed or slightly kneed, with 

 the basal joint long or thickened ; the end joints of the antennae 

 broadened out on one side to form a sort of club ; these 

 extensions of the antennae are leaf-like or fan-like or comb-like, 

 and in many species can be spread out or brought close 



^ For a detailed classification of the adult beetles, the reader is referred to 

 Fowler's Cohoptera, vol. iv. page 4. 



- In drawing up the key for the larva", I have been greatly indebted 

 to Perris's Lan'es dc Coleopteres and to Schiudte's De Metamorphosi 

 eleutheratoruiu observationes, adapting their descriptions with slight additions 

 after comnarison of specimens of the larva. 



