58 Psyche [April 
England States, the percentage of parasitism has been well over 
50 per cent. At times, as many as five maggots have matured 
within an individual host. I have before me a single female of 
this species, reared from Callosamia promethia Drury, May 2, 
1914, by Mr. William Reiff at Forest Hills, Mass. These data 
appear to establish the fact that Compsilura concinnata hibernates _ 
through the winter in New England in the pupa of this host. 
The writer has also reared a male and female of this species, from a 
pupa of Diacrisia virginica Fabr., taken as a larva late in the fall 
of 1915 at West Springfield, Mass., the adult Compsilura issuing 
May 12-15, 1916. The tachinid maggots apparently hibernate in 
the host pupa until just before they are ready to pupate, whence, 
they leave the host pupa, probably in early April, and pupate 
within the cocoon of their host. 
Exoristoides slossone Coq.! 
Three males of this species before me, taken at Bennington, Vt.’ 
June 18, 1915, by Mr. C. W. Johnson. One male with setule 
present upon the first longitudinal vein agrees in detail with Co- 
quillett’s description of slossonze. The remaining two specimens 
without the presence of setule upon the first longitudinal vein, 
agree with the description of Exorista spinipennis Coq.,” yet it is 
evident that all three specimens are conspecific. The character 
of setulze being present upon the first longitudinal vein, within the 
limits of E. slossona, is a variable one. With the exception of this 
character the descriptions of Exorista spinipennis and E. slossone 
are almost identical. I consider Exorista spinipennis Coq. a 
synonym of Exoristoides slossone Coq. 
1 Rey. N. Amer. Tach., p. 90-91. 
2Rev. N. Amer. Tach., p. 95. 
