S66 



HOWARD 



sued on June 17, in all 55 coming from this one deposit. From 

 faeces collected June 13, adults of this species issued on June 26. 

 From a child's faeces, exposed on July 7 in a backyard in north- 

 east Washington, adults issued on July 21. From a similar de- 

 posit exposed July 9, in the same locality, adults of this species 

 issued July 22. From a similar deposit exposed July 24, in the 

 same localit}^, adults issued in numbers August 9 to 11, "about 

 thirty specimens being reared from a single deposit. The same 

 species was also bred from excrement found in the latrines at 

 the camp of the District militia at Leesburg, Virginia, June 19, 

 1899, and it was captured upon faeces at Marshall Hall, Mary- 

 land. It is a common, widespread and dangerous species. 



Sarcophaga assidua Walker. 

 This species which seems to be restricted to the United States, 

 or which, at all events, has not been reported from elsewhere, 

 is a species which also resembles the house fly, having about 

 the same size and being, therefore, considerably smaller than 

 the last named species, Sarcophaga sar)'acenicB. Nothing was 

 definitely known of its breeding habits until the present investi- 

 gations were begun. It was captured May 12, 1899, upon 



Fig. 21. Sarcophaga assidua : puparium at left ; adult in middle, with enlarged 

 antenna; larva with enlarged parts, at right — enlarged (original). 



human fasces exposed six hours, and again on the same day 

 upon older excrement. On July 3, a deposit was found atPiney 

 Branch, Maryland, and was brought to my oflice and on July 

 25 a number of specimens of this species issued. On Ma}' 16, 



