INSECT FAUNA OF HUMAN EXCREM1':NT 585 



lected June 6 at Washington, District of Columbia, and was 

 found by Mr. Pratt in a privy at Oxen Hill, Maryland. 



HydrotcBa mctatarsata Stein. 

 This species was captured upon a deposit at Travilah, Mary- 

 land, by Mr. Pratt. 



Ccenosta palltpes Stein. 

 The larvae of this genus live in fungi, cow dung, and de- 

 caying vegetable material. The present species was captured 

 in a door-yard privy in Alexandria, Virginia, September 13, 

 1899, by Mr. Pratt. 



MydcBa -palposa Walk. 

 This species was captured at Travilah, Maryland, in June, 

 1899, upon an old deposit. 



Family ORTALID^. 



A group of flies with usually spotted or banded wings and 

 frequently of metallic colors. The larvae of one species occurs 

 under the bark of pine and poplar and the larvae of another 

 work in the stalks of sugar cane and corn, either following 

 damage by another insect or on healthy stalks. 



Euxesta notata Wied. 

 This fly occurs throughout the eastern United States. It is a 

 small shining species of somewhat coppery tinge, the wings 

 bearing a brown spot at the tip. It has previously been reared 

 from onions, cotton bolls, osage orange fruit and apples pre- 

 viously infested by Codling Moth ; probably only follows work 

 of other insects in such cases. It was reared in Washington, 

 District of Columbia, June 8, 1899, from feeces exposed May 

 12 for six hours. It was also collected May 16 on a fresh de- 

 posit exposed for 15 minutes. 



Rivelha pallida Loew. 

 The metamorphoses of the insects of this genus are recorded 

 as unknown. R. pallida, originally described from the Dis- 

 trict of Columbia, was captured upon excrement at Rosslyn, 

 Virginia, by Mr. Pratt. 



