156 
JOUKNA.L OF THE PLYMOUTH INSTITUTION 
forwards, each hair slightly curved, the caterpillar having the 
appearance of being enclosed in a beautiful delicate silk-like cocoon, 
the head thereby concealed as much as the anal segment. 
With reference to the flight of Locusts, Acridium peregrinum, 
mentioned by Mr. Rowe {Journal, vol iv. p. 8), it is worthy of 
note that they occurred sparingly from Burton-on-Trent to Pen- 
zance, and I believe no record has been found of their previous 
occurrence in England. Their native home is Asia and Northern 
Africa. They arrived in England during the night of the 8th 
or morning of the 9th Oct., 1869. The prevailing wind around 
the British Isles and North of Erance was for some days easterly, 
and at Plymouth on the evening of the 8th it was south, and by 
the next morning S.E., the wind evidently in favour of the 
insects landing on this coast. The heat in the shade on the 8th 
and 9th was 74° and 76° Eahr. May not the temperature have 
influenced the migration?" 
J. Beooking Eowe. 
