46 Bulletin of the Brooklyn Entomological Society. Vol. XIV 
of the Massachusetts Agricultural College is one specimen bear- 
ing the following label: “From maggots in a crab (sea spider), 
Harpswell, Maine.” At Laurel, Montana, in 1914, the author 
reared this fly from decaying fish. A few specimens were reared 
by J. R. Parker of the Montana Experiment Station, from dead 
grasshoppers collected in the Flathead Reservation in the summer 
of 1917. Others were reared from similar material collected in 
early September by J. R. Parker and the author. 
S. dux subspecies a (exuberans ?).—A single specimen of this 
subspecies emerged early in February of 1918 from a dead grass- 
hopper collected by the persons above-mentioned near Ronan, 
Montana, on September 5, 1917. 
EXPLANATION OF FIGURES. 
Fic. 1. Profile view of tip of forceps prong of S. dux luzonensis. 
Fic. 2. Profile view of tip of forceps prong of S. dux harpax. 
Fic. 3. Profile view of tip of forceps prong of S. dux tuberosa. 
Fic. 4. Profile view of tip of forceps prong of S. dux dux. 
Fic. 5. Profile view of tip of forceps prong of S. dux sarracenoides. 
Fic. 6. Profile view of tip of forceps prong of S. dux subspecies b. 
Fic. 7. Distal portion of penis of S. dux luzonensis. 
Fic. 8. Distal portion of penis of S. dux harpax. 
Fic. 9. Distal portion of penis of S. dux subspecies a (exuberans ?).* 
Fic.10. Distal portion of penis of S. dux tuberosa. 
Fic. 11. Distal portion of penis of S. dux dux. 
Fic.12. Distal portion of penis of S. dux sarracenoides. 
Fic. 13. Distal portion of penis of S. dux subspecies 0. 
* The genital segments of the single specimen of this species examined 
were in such condition that it was impossible to figure the forceps prong 
or to complete the figure of the penis. i 
