6 



MISC. PUBLICATION 631, U. S. DEPT. OF AGRICULTURE 



The third, or accidental, myiasis-producing group (table 3) consists 

 of an assemblage of more or less unrelated Diptera, the larvae of which 

 occasionally find their way into the human body, usually the gastro- 

 intestinal tract. For the most part this group contains species which 

 breed in various substances, including some used by man as food, and 

 which occasionally are taken with the food into the human digestive 

 tract, where they survive with varied success. Certain members of 

 this group may even enter the urinary passages and bladder. More 

 rarely, others attack wounds or the cavities of the head, but such in- 

 vasions seem purely accidental and -are usually unsuccessful. Some 

 members of this group are of moderate importance as myiasis 

 producers. 



The division betwee nthe first and the other two groups is clear-cut, 

 the only question being the specificity of the fly larva on living human 

 or other mammalian tissue. The second and third groups cannot be 

 separated so definitely. A real question might arise, for example, as 

 to the position of the species of Musca, Muscina, Fannia, Megaselia, 

 and certain Sarcophaga. These species might be considered inter- 

 mediate between the true semispecific and the purely accidental myiasis 

 producers. 



Table 1. — Specific myiasis-producing 



Diptera 









Cutaneous or subcutaneous 



Cavity 



Family and species 



Trau- 

 matic 



Creep- 

 ing 



Furun- 

 cular 



Nose, 

 mouth, 



and 

 sinuses 



Eyes 



Ears 



Anus, 



vagina, 



etc. 



SARCOPHAGIDAE 



X 







X 



X 



X 









X 

 X 



X 





Wohlfahrtia opaca . 















CALLIPHORIDAE 



X 

 X 





X 

 X 



X 

 X 



X 



X 





Chrysomya bezziana 





X 



Auchmeromyia luteola i__ 









Cordylobia anthropophaga . .. 







X 

 X 

























GASTEROPHILIDAE 



Gasterophilus intestinalis 2 





X 



X 



? 



X 

 X 

 X 





X 







Gasterophilus haemorrhoidalis. _ 













Gasterophilus nasalis 















HYPODERMATIDAE 



Hypoderma diana 





X 



X 

 X 





X 

 X 

 X 







Hypoderma bovis 











Hypoderma lineatum ___ 











CUTEREBRIDAE 



Cuterebra sp- ._ . _ . . __ 





X 







Cuterebra buccata _ _ 







X 

 X 









Dermatobia hominis... 















Cephenemyia sp. . 







? 



X 









OESTRIDAE 



Oestrus ovis 









X - 

 X 



X 





Rhinoestrus purpureus 

























1 Bloodsucking maggot. 



2 Undetermined species of Gasterophilus are also recorded in enteric myiasis. 



