The human transport of animals across the Northern Atlantic 



179 



FIG. 22. The Bideford-Barnstaple district of North Devon. 



Crosses indicate the author's collecting places; "V a" is "The Crow". 



The broken line is the deepest channel of the rivers Taw and Torridge used by 

 ships. 



Of particular interest are the Lamellicorn beetle Aegialia arenaria F. and the 

 weevil Philopedon plagiatus Schall. (fig. 26). The former has been introduced into 

 Massachusetts (Darlington, 1927), the latter on several localities in the Maritime 

 Provinces of Canada (Brown, 1940, p. 76; 1950, p. 202). 



In the tidal zone north of the tip, on the east side of the peninsula, the soil was 

 heavily mixed with mud. The vegetation consisted of scattered Salicornia sp. and 

 thin crusts of green algae. 



Recorded Coleoptera, all extremely abundant: 



Bembidion (Cillemis) laterale Sam. 

 Dichirotrichus piibescens Payk. 



Bledius spectabilis Kr. 



None of these occurs in North America. 



b — The quarry immediately south of Appledore close to the western bank 

 of River Torridge (fig. 24). Captain Schiller of Appledore, aged 75, told me that 

 sailing-vessels took gravel and stones as ballast from this place. The bottom of the 

 quarry, where the collecting was carried out, is a dry, hard, stony plane, with 

 scattered loose heaps of stones and gravels. The vegetation was discontinuous, 

 rich in species, and had a pronouncedly synanthropous character: 



