Occasional Notes. 137 



along the higher part of the Demerara river, and 

 referable to species of Lampyrt'dx. Through the kind- 

 ness of Mr. W. F. Bridges, who forwarded me a 

 specimen from the Berbice river, I have been enabled 

 to examine another luminous larva, referable to the 

 Elateridse or spring beetles, and commonly known as the 

 Labarria Seh or Labarria worm among the Indians, who 

 are said to consider it as being as venomous as the 

 labarria snake, though the little grub is reallv a perfeftly 

 harmless obje6l. The same, or a closely allied species 

 has already been briefly referred to in the pages of this 

 Journal (Timehri, 188S, p. jrgj by Mr. H. I. Perkins, 

 who found it in association with the large " three lights" 

 fire-fly (Pyrophorus) in the Puruni distri6l. The 

 luminosity of this form, when it is observed in a dark 

 place, is singularly striking and beautiful. The light is 

 emitted along the whole length of the body — the head, 

 the front part of the anterior segment, and the last 

 segment of the body, being altogether luminous, while 

 each intermediate segment gleams from a small area on 

 each side of the back, two regularly arranged rows of 

 golden brilliants being thus observable. The light is 

 continuous, and very bright, but it is intensified when 

 the little creature is irritated. At intervals, one or more 

 of the dorsal lights will be observed to be very dull 

 or nearly extinguished, but apparently they are never 

 quite put out. 



» 



Presentation to Charles Edmonstone. — I am indebted 

 to Mr. Rod WAY for the fafts of the following note, 

 which will be of interest in relation to the article on 

 Waterton and his Demerara friend. When Edmon- 



S 



