56 First Report on Economic Zoology, 



Lucilia cccsar, Linn., also lays its eggs on wounds ; probably the 

 sheep-fly, L. sericata, Meig., does the same. 



The Senegal or Cayor Fly (Ochromyia anthrojMphaga, Blanchard). 

 The larva} or Cayor worms de^^elop beneath the skins of man and 

 animals and often produce serious Myiasis in Senegal. Dermatohia 

 noxialis, Goudot, also lives beneath the skin of man as well as 

 animals, occuiTing from Mexico to Brazil. It is known under a 

 rariety of names, such as the Macaw worm in Cayenne, the Ura in 

 Brazil, the Torcel at Costa Eica, the IMozoquil worm in Mexico. 



The Maggot Fly of Xatal {Auclimeroyia {Bengcdia) deprssa, 

 Walker), also produces serious cutaneous Myiasis ; this pest is one of 

 the Sarcophagidfe. It is not restricted to l^atal, but occurs further 

 up the coast, having been recorded from Delagoa Bay. The range of 

 this serious cutaneous parasite seems to be limited to the coast and 

 no further inland than 1000 feet elevation. It is common from the 

 Tugela downwards (;vidc Agri. Journal, Xatal Dept. Agii. and jMines, 

 vol. iv. p. 606, 1901. C. Fuller). Vide also note on Screw Worm 

 (p. 131), 



Correspondence on the Mosquito Annoyance at 



Blackheath. 



The following letter was received on November the 6th, 1901, 

 from the Public Health Department, Borough of Greenwich : — 



Dear Sir, — Complaints have been made to my Committee respecting 

 the inconvenience caused to tlie inhabitants in this neighbourhood by the 

 bite or sting of insects found in the neighbourhood of Greenwich Park and 

 Blackheath, popularly supposed to be mosquitoes. I shall esteem it a 

 favour if you can give me any information you may have respecting this 

 class of insect found in that immediate neighbourhood. 



I am, etc., 



Erxest George Axxis, M.R.C.S., etc., etc.. 



Medical Officer of Hecdth. 

 To F. V. Theobald, Esq., 



Natural History Museum. 



To Dr. Ernest George Axxis, M.Pi.C.S., etc., 



Medical Officer of Health, Greenwich. 



Dear Sir, — It is somewhat difficult to answer the questions in your 

 letter re the annoyance caused by biting insects reported to your Com- 

 mittee without seeing actual specimens of the pests. 



