J. R. MALLOCH 231 



In the group treated in this paper I use the pleural characters 

 just cited as of specific value, though in a few cases I am inclined 

 to believe that they do not even admit of that interpretation. 



There are some minor characters which I have introduced in 

 the present paper, such as the structure and hairing of the fore 

 tarsus, and especially that of the basal segment. The presence 

 or absence of fine hairs adjacent to the bases of the notopleural 

 bristles has some value as a character for the differentiation of 

 species and even groups, but whether it is possible to use it 

 successfully for species from a larger faunal area than is included 

 in this paper I am unable to say. 



In ])ut few cases are there hairs on the prosternum in North 

 American Phaoniinae, onty one or two such occurring within the 

 group under consideration, but many African and other exotic 

 forms have hairs on this part of the thorax, as do all the species 

 of the genus Limyioj)hora R.-D., which is of cosmopolitan 

 occurrence. 



A few genera of Phaoniinae have the declivitous posterolateral 

 portion of the mesonotum, caudad of wing l:)ase and extending 

 to anterior margin of scutellum, with setulose hairs. I have 

 found this character present in some Sarcophagidae and allied 

 groups, and in a few exotic Phaoniinae. 



There is very little variation in the wing-venation in Phaoni- 

 inae, though in a few cases the fourth vein is curved more or less 

 forward. In no case i? it angularly bent as in Musca and allied 

 genera. 



The hj'popygia of closely allied species in Phaoniinae are 

 usually very similar and, as a study of these would entail the 

 expenditure of too much time and the number of species available 

 now is far from the total of those occurring in this country, I 

 have not attempted to use this character in the present paper. 



Key to (xcnera and Subgenera 



1. The declivitous portion of mcsonotum immediately in front of scutellum 

 and above calyptrae with some hairs in center; first and third wing- 

 veins setulose 2 



— The declivitous portion of mesonoturu in front of scutellum and above 

 calyjitrae bare; at least the first wing- vein bare 4 



TRAXS. AM. EXT. SOC, XLVHI. 



