1910] Thompson—Notes on Diptera 211 
looked the fact that what is apparently the same form has been 
described already by Mr. Coquillett in the “Revision of the Tach- 
inide,” pp. 97-98, as Exorista amplera. An examination of the 
series of specimens referred by Mr. Coquillett in the “Revision,” 
to griseomicans v. d. Wulp, of those described by him as amplexa, 
and of the specimens included by Mr. Townsend under hemero- 
campe, has disclosed the fact that the number of post-sutural 
macrocheetze is variable within the species, many specimens 
having three post-suturals on one side and four on the other. 
No other differences between the three forms are perceptible and 
consequently they must be referred to one and the same species. 
It is doubtful if the species is the one described by van der Wulp 
in the Biologia as griseomicans. His description omits several 
of the important characters but the legs are described as “black”’ 
whereas in all of the specimens of this form which I have examined, 
the tibize and often the femora as well, are reddish-yellow. Until 
it can be positively determined by an examination of van der 
Wulp’s type that the species are not distinct the synonomy must 
stand as follows: 
Exorista amplexa Coqt. 
1897. E. amplexa Coqt., in Revision of the Tachinide, pp. 97-98. 
E. griseomicans Coqt. (non van der Wulp), loc. cit., p. 98. 
1909. Sisyropa hemerovampe Towns., in Ann. Am. Ent. Soc., Vol. II, no. 4, 
p. 248. 
Mr. Townsend gives no reasons for referring the species to the 
genus Sisyropa and until such reasons are forthcoming it must 
remain in the genus Exorista. 
Eumasicera coccidella Towns. 
The type of this species, which is a single female from Massa- 
chusetts, agrees perfectly with types and co-types of Stwrmia 
sternalis Coqt., described from Missouri, and the forms seem to 
be without doubt identical. The genus Eumasicera certainly 
cannot stand since the species runs to the genus Sturmia in Mr. 
Townsend’s own key to the genus Argyrophylax and its allies, 
in the “Taxonomy of the Muscoidean Flies,” p. 98. 
Rileyella Towns. 
