Manchester Memoirs, Vol. xlvii. (1903), No. 4. 7 



/^/jf. 5.— a.— OldneSt >„ , 



/;.-New nest ) °" "^^'^^^7 ground. 



f, f. — Bolt-runs. 



Fig. 6. — View from above of Fis^. 5. 



Fig. 7- 



Tunnels to heap earth over the nest. 

 Tunnels from nest. 



