584 



HOWARD 



exposed faeces in southwest Washington and was reared June 

 i6 from miscellaneous faeces collected June 13. Numbers were 

 reared from excrement brought from the District of Columbia 



Militia camp at Leesburg, 

 >* /^ Virginia, to Washington, and 



it was also captured in a privy- 

 near Washington. 



Phorbia /usciceps Zett. 

 This species, also common 

 to Europeand North America, 

 has been reared from pupae 

 of Lepidoptera and egg-cases 

 of grasshoppers. It is also 

 said to injure seed corn and 

 Fig. 31. Phorbia cinerella, with eu- beans in the ground. This 

 larged antenna at right- enlarged (orig- gpecies was reared at Wash- 

 ington, District of Columbia, 

 in June and also at Travilah, Maryland, by Mr. Pratt. It was 

 also collected in a privy at Falls Church, Virginia, by Mr. 

 Banks. 



Hylemyia juvenalis Stein. 



The larvae of this genus are found in decaying vegetable 

 material, in cow dung, and similar substances. The present 

 species was captured upon human excrement at Marshall Hall, 

 Maryland, September 17, 1899, by Mr. Pratt. 



Hydrotcea dentipes Meig. 

 The larva of the flies of the genus HydrotcBa are found in 

 cow dung and in decaying vegetables and according to Zetter- 

 stedt one European species has been found in human excre- 

 ment. It is mentioned in works on internal myiasis. The 

 present species is common to Europe and North America and 

 is a small dark-colored fly superficially resembling the house 

 fly. It was captured May 12, 1899, upon faeces exposed for six 

 hours at Washington, District of Columbia, and again on de- 

 posits from three to six days old on the grounds of the U. S. 

 Department of Agriculture. It was reared from a deposit col- 



