482 MI9S O. C. LODGE OX THE 



most common at the Zoological Gardens during the early summer, 

 viz. : — 



(a) Calliphora erythrocephcda and 1 r^j^^ Blue-bottles. 



,, vomitora J 



(b) LuciUa ccesar The Green-bottle. 



(c) ProtocalUphora groenlandica (released from breeding-cage). 



(d) Musca domestica The House- Hy (scarce) *. 



(e) Fannia canicidaris The Lesser House-fly. 



, , scalaris The Latrine-fly. 



(f ) Fiophila casei The Cheese-fly. 



(g) Sarcophaga carnaria , The Flesh-fly. 



I. Methods and account of experiments ivith various 

 organic compounds. 



In these experiments the usvial method adopted was to soak 

 pieces of blotting-paper in the dijfferent substances to be tested, 

 and to place them inside or outside the wire gauze breeding-cage 

 (in which F. groenlandica were bred). At the same time, controls 

 consisting of similar pieces of blotting-paper soaked in water 

 were placed beside each. The resvilts were compared, and a note 

 made as to whether the number of flies (if any) which came to 

 the chemicals was equal to, greater, or fewer than the number 

 which came to the controls. 



The various substances used, classified according to their 

 attractiveness, are given below (A-E). 



A. Substances found to he attractive to P. groenlandica. 



Honey. Fructose (solution in water). 



Cane-Sugar molasses. L«vulose „ „ 



Beet „ „ Cane-Sugar „ „ 



Lactose (solution in water). Urine (6 daN's old). 

 Maltose „ „ „ (16 days old). 



Glucose „ „ Uric acid. 



B. Substances fotind to be decidedly repellent. 



Pipendine. Oil of Cinnamon leaf, 

 ffinanthol (weak). „ ;, bark. 



Xylol. „ Sassafras. 



Oil of Thyme. „ Cloves. 



., Cassia. Camphor. 



„ Java Citronella. Amy! acetate. 



„ Ceylon Citronella. Methyl salicylate. 



„ Palma rosa. Anisole. 



„ Bay. Citral (strong). 



„ Heliotrope. Ethyl sulphocyanide. 



,, Lavender. 



* Very few house-flies were seen in the Zoological Gardens during these experi- 

 ments, pro'nably because it was still early in the season for them ; although they 

 were never at all abundant there, even in August and September. 



