INSECT FAUNA OF HUMAN EXCREMENT 567 



several specimens were captured on a fresh deposit exposed 

 only fifteen minutes on the grounds of the Department of Ag- 

 riculture. It was also captured during the summer upon fcTcces 

 of varying ages at Travilah, Maryland ; Snickers Gap, Vir- 

 ginia ; Cabin John Bridge, Maryland ; Marshall Hall, Mary- 

 land, and at Leesburg, Virginia, the latter specimens at the 

 militia camp previously mentioned. It was also bred from this 

 material in the northeast Washington experiments, six speci- 

 mens issuing July i8 to 26, from a child's fasces exposed in a 

 back yard, July 9. September 9 it was reared from a deposit 

 taken"^ August 25 on the Potomac Flats and which was ap- 

 parently about six days old when taken. 



Sarcofhaga lambens Wiedeman. 

 This fly, which is recorded from the West Indies and from 

 Brazil, was taken from human excrement in Porto Rico by Mr. 

 Busck in the spring of 1899. 



Sarcophaga flinthofyga Wiedeman. 



This species, which has been taken in Brazil, Dutch Guiana, 

 West Indies and Nova Scotia, was also captured by Mr. Busck 

 in Porto Rico in the spring of 1899. 



Sarcophaga trivialis v. d. Wulp. 



This species, originally described from Mexico, was captured 

 on human excrement and bred from it at Travilah, Maryland ; 

 Washington, D. C, and at Snickers Gap, Virginia, in May, 

 June and July, 1899, and was also captured during the summer 

 at Cabin John Bridge, Maryland. 



Cynomyia cadaver ina Desv. 



The flies of this genus live in the larval condition in foul 

 animal matter and decaying flesh. The European Cynomyia 

 mortuorum seems to be exclusively a carrion feeder, since larvae 

 transferred by Porchinsky from meat to cow dung and rotten 

 fungi grew very slowly and finally perished. Several species 

 are found in this country and the one under consideration was 

 originally described from North or South Carolina. It has been 

 captured at Washington, D. C, on exposed excrement. 



