1935] Larva and Puparium of Physocephala sagittaria 143 
As reported, the species are parasitic upon various genera 
of bees, wasps, ants, termites, and grasshoppers. Brauer 
(1. c.) gives a list of the genera from which these parasitic 
flies had been reported and very little has been added since. 
Brauer’s list of host genera was copied by Williston (1. c.). 
The genus Stylogaster is probably parasitic upon ants of 
the genus Eciton. Aldrich (1930) gives information re- 
ceived from Dr. Wm. Mann and Dr. C. H. Curran concern- 
ing the habits of adults with reference to armies of moving 
ants in Central America. Only one genus ( CEdipoda ) of 
Orthoptera has been reported as parasitized by the Con- 
opidse. The termite record of Silvestri is the only au- 
thentic one available. Bates (1863) has been credited with 
saying in his Naturalist on the River Amazons (vol. 1) 
that these larvae attack termites but Aldrich (1. c.) states 
that he could find no such reference in any of Bates’ works. 
Frison (1926) reported the rearing of Physocephala sagit- 
taria (Say) (det. J. R. Malloch) from the abdomen of dead 
workers of Bremus auricomus (Robts.). The same author 
(1930) recorded this parasite from Bremus americanorum 
(Fabr.). 
The material upon which this paper is based was reared 
from workers of B. auricomus (Robts.) by Dr. T. H. Frison, 
Chief of the Illinois State Natural History Survey, and to 
him the writer expresses sincere thanks for being permitted 
to describe it. The writer wishes also to thank Dr. C. 0. 
Mohr, Associate Entomologist, Illinois State Natural His- 
tory Survey, who drew figures 1, 4, 5, and 6. 
Mature larva. — The larva (fig. 4) has a broad, some- 
what rounded body. The cephalic portion, or head and 
thoracic region, is much narrowed and being somewhat 
extensible, projects from the body much as a snout. This 
portion can be varied in thickness by the larva. The larva 
can be described as being typically pyriform. Relaxed and 
extended it measures approximately 13 mm. in length and 
5 mm. in breadth at the widest portion. The narrowest 
cephalic portion is approximately 1 mm. wide. The body 
narrows to approximately 3 mm. at the location of the pos- 
terior spiracles. 
The color is yellowish white. No attempt has been made 
