82 
Psyche 
[April 
The second antennal joint is about one-half the length of the 
third. There are three or four black setae on the lower part of 
the front coxae. 
This is the form mentioned in Bulletin 143 of the Washing- 
ton State Agricultural Experiment Station, page 56, as super- 
ficially resembling Piophila affinis. Insamuch as I have taken 
seventeen specimens all constant in the correlation of characters 
given above the form may be given specific rank. The localities 
represented are Yellowstone Park, several places, Flathead 
Lake, Montana, and Chicago, Illinois; all captured in July or 
August. 
P. xanthostoma has the front entirely black and plane or 
convex to the lunule. In only one specimen is there any yellow 
color above the antennae. The second antennal joint is extremely 
variable but always is longer in proportion to the third joint 
than in this brachycerous form. The coxal setae are present in 
the male but are undeveloped in the female. In Piophila affinis 
the venter of the male is shaggy with black hair, which is not 
the case in Prochyliza. 
Subgenera of Piophila. 
The genus Piophila was based on P. casei as genotype but 
the inclusion of many subsequently described species has caused 
it to become heterogeneous. In line with the present tendency 
to recognize finer distinctions Hendel in 1917 segregated the 
genus Allopiophila from the group, basing it entirely on chaeto- 
tactic characters. Piophila casei and a few of its congeners are 
markedly different from the majority of the species left in ^Pio- 
phila. Removal of the species grouped with P. casei and the 
separation of those in Allopiophila makes it necessary to revive 
Lioy’s name Stearihia, founded on foveolata Mg.=nigriceps Mg. 
As the size of bristles is quite variable the diagnostic characters 
have only relative and not absolute value. Hence it is premature 
to assign more than subgeneric rank to these names. 
In order to show the relationships of the species of Piophila 
with reference to the divisions into subgenera and to facilitate 
identification of several new forms the following table is presented. 
