1632 THE MYIASES AND ALLIED CONDITIONS 



Traumatic Dermal Myiasis, 



Definition. — Traumatic dermal myiasis is the invasion of wounds 

 or ulcers of the skin by the larvae of dipterous insects, principally 

 belonging to the Muscidae and Sarcophagidse. 



Historical. — One of the earliest pubhcations with references to 

 this is Joseph in his ' Myiasis Externa Dermatosa,' published in 

 Hamburg in 1800, but a large number of observations have been 

 published since then. 



etiology. — The larvae which have been recognized so far are: — 



MuscidcB (Subfamily: Muscinae) : — 

 Chrysomyia macellaria Fabricius. 

 Chrysomyia viridula Robineau-Desvoidy. 

 Calliphora, sp. ? 



Lucilia argyrocephala Macquart. 

 Lucilia, sp. ? 



Cordylobia anthropophaga. 

 Musca putrida. 

 SarcophagidcB :— 



Sarcophaga carnaria Linnaeus, 1758. 

 ,, magnificaSchmox ,1^62. 

 ,, ruficornis. 



chrysostoma Wiedemann. 

 „ plinthopegga Wiedemann. (The adult is one 

 of the ' yaws flies ' of Dominica.) 

 sp. ? 



Symptomatology.- — The larvae accentuate the putrid condition of 

 the sores and the sufferings of the patient. 



Treatment. — Antiseptic douches, syringing, with removal of the 

 larvae, and subsequent antiseptic dressing. 



Prophylaxis. — The myiasis can, of course, be prevented by simply 

 applying aseptic dressings to wounds. 



Subcutaneous Myiasis. 



Synonyms. — Cutaneous myiasis. French, Myase cutanee, Myase furon- 

 culeuse, Myase rampante sous-cutanee; Italian, Myasis cutanea; German, 

 Myasis. 



Definition. — Dermal myiasis is the invasion of the skin by the 

 larvae of species of the (Estridae, especially by Dermatohia cyani- 

 ventris Macquart, 1843, and by those of the Muscidae, especially 

 Cordylobia anthropophaga Blanchard. 



Remarks. — It is necessary to be careful to consider the zoological 

 region when determining the species of the fly to which a maggot 

 found in a case of dermal myiasis belongs, as it is unlikely that a 

 species known to occur in Africa will be found in America, and vice 

 versa. Further, it is desirable to determine definitely the nature 

 of the fly causing the myiasis, and therefore this should be bred out 

 as described in the opening sections of this chapter. 



