548 HOWARD 



breeding in excrement. Neither the beetles nor the Hymenop- 

 tera, however, have any importance from the disease transfer 

 standpoint. The Diptera alone were the insects of significance 

 in this connection. Of Diptera there were studied in all 77 

 species, of which 36 were found to breed in human faeces, while 

 the remaining 41 were captured upon such excrement. The 

 following list indicates the exact species arranged under their 

 proper families. The parenthetical remarks after each species 

 should be estimated in the following order, from 'scarce' to 

 'extremely abundant': scarce, rather scarce, not abundant, 

 moderately abundant, abundant, ver}?^ abundant, extremely abun- 

 dant. 



REARED (USUALLY ALSO CAPTURED). 



Family Chironomid.e. 



1. Ceratopogon sp. (scarce). 



Family Bibionid.e. 



2. Scatopse pulicaria Loew (moderately abundant). 



Family Empidid^. 



3. Tachydromia sp. (rather scarce) . 



Family Dolichopodid^. 



4. Diaphorus leucostomus Loew (scarce). 



5. Diaphorus sodalis Loew (not abundant). 



Family Sarcophagid^. 



6. Lucilia caesar L. (abundantly captured ; one reared). 



7. Sarcophaga sarraceniae Riley (abundant). 



8. Sarcophaga assidua Walker (abundant). 



9. Sarcophaga trivialis V. d. W. (abundant). 



10. Helicobia quadrisetosa Coq. (very abundant). 



Family Muscid^. 



11. Musca domestica L. (abundant). 



12. MorelHa micans Macq. (abundant). 



13. Muscina stabulans Fall, (abundant). 



14. Myospila meditabunda Fabr. (abundant). 



Family ANTnoMYiiDuE. 



15. Ilomalomyia brevis Rondani (very abundant). 



16. Homalomyia canicularis L. (moderately abundant). 



