INSECT FAUNA OF HUMAN EXCREMENT 



587 



minimum duration of the early stages in this case 23 days. 

 From the same lot it was also reared on the 23d of May and was 

 collected upon excrement on May 13 and May 16. A little 

 later in the season, with warmer weather, it was reared, on June 

 10 after a period of immature existence of 14 days, and on the 

 23d of June was reared from a deposit of unknown age. 



Fig. 32. Sepsis violacea -. adult with enlarged antenna, at right ; puparium 

 at left — enlarged (original). 



On September 11 it issued in swarms from a deposit col- 

 lected August 18, and on the same day issued in great numbers 

 from an old deposit collected on the Potomac Flats August 25. 

 They also issued on this day in swarms from old excrement 

 collected August 31. 



Nemo^oda mmuta Wied. 



The larvae of one species of this genus {N. cylindrica^Qsv .) 

 has been found in Europe in human excrement. Therefore, 

 the similar occurrence of the present species in this country was 

 quite to be expected. iV, minuta is an American species and 

 was originally described from New York. It is superficially 

 much like the preceding species but can at once be distinguished 

 by the lack of the dusky spot near the tip of the wings. It has 

 been taken in outdoor privies at Snickers Gap, Virginia (July 



