INSECT FAUNA OF HUMAN EXCREMENT 551 



Family Borborid.-e. 



31. Borborus equinus Fall, (very abundant, undoubtedly breeds 



here also). 



32. Borborus geniculatus Macq. (moderately abundant). 



33. Limosina crassimana Hal. (abundant). 



Family Syrpiiid^. 



34. Syritta pipicns L. (scarce). 



Family Piiorid^. 



35. Phora femorata Meig. (scarce). 



Family Scatophagid^e. 



36. Scatophaga stercoraria L. (moderately abundant). 



37. Fucellia fucorum Fall, (rather scarce). 



Family Micropezid^. 



38. Calobata fasciata Fabr. (rather scarce). 



39. Calobata antennipes Say (moderately abundant). 



Family Helomyzid^. 



40. Leria pectinata Loew (scarce). 



41. Tephrochlamys rufiventris Meig. (scarce). 



The details not only of our observations but of what was 

 previously known concerning each species, together with some 

 account of the habits of each genus and family will be given 

 later. It should be stated here that this list, containing as it 

 does only a record of actual observations, should by no means 

 be considered as indicating definitely the habits of the species 

 or their relative abundance under other conditions. Thus, 

 some of the species here indicated as scarce in connection with 

 excrement, may be very common under other conditions, which 

 would indicate that their occurrence upon excrement was more 

 or less accidental. Moreover, certain of the species which 

 have been captured on excrement but not reared from it are 

 nevertheless undoubtedly excrement breeders as will be proved 

 by future observations. Thus, we have in several cases certain 

 species which have been reared while congeneric species have 

 simply been captured, as, for example, Nos. 7 and 8 of the 

 captured species are congeneric with 7, 8 and 9 of the reared 

 series; 11 and 12 of the captured series are congeneric with 13 



