288 Mr. C. H. T. Townsend on Diptera 
It seems probable that Wulp’s X. dorsalis, and perhaps 
some of his other species, are either identical with or con- 
stitute but varieties of atripennis and arcuata. 
Jote.—On the underside, at extreme base of abdomen, in 
both sexes, apparently on first segment, there is to be distin- 
guished, sometimes plainly, sometimes with much difficulty, 
a transverse swelling or prominence of the yellow integument 
clothed with some rather conspicuous black hairs. This has 
nothing whatever to do with the ventral peculiarities of the 
second segment of female in Besserta, which are very different. 
And while on this subject I may here confirm Mr. Coquillett’s 
maintenance of his genus Ce/atoria as distinct from Besseria. 
The ventral process of the second segment of male in Cela- 
torta is wholly different, «as are all the other characters. 
This can at once be seen by comparing the figure of Celatoria 
in ‘Insect Life,’ ii. p. 234, with that of Besserta given by 
Brauer and Bergenstamm in the ‘ Muscaria Schizometopa,’ 
i. figs. 288 (head and abdomen of female), and by Coquillett’s 
notes on the characters in ‘ Psyche,’ June 1895, p. 252. 
Celatoria does not belong in the Phaniide at all, but in 
some as yet undetermined and undescribed group of the 
Tachinide. 
It may be pointed out that Wahlbergia brevipennis, Lw., 
from Nebraska, is not a Nanthomelanodes. Neither is it a 
Besserta. 1 have had figures drawn of the head and wing 
of this species, as well as of several other of Loew’s un- 
recognized North-American Tachinide, made from the type 
specimens in the Cambridge Museum, which will be pub- 
lished later in a separate paper. But it may be mentioned 
here that Hyalomyia triangulifera, Lw., which is one of these 
species, is not a Hyalomy7a, but is identical with Hyalomyodes 
Weedit, Towns., which thus becomes a synonym. ‘The species 
will be known as Hyalomyodes triangulifera, Lw. (see 
‘ Psyche,’ April 1893, pp. 429-430). Loew’s Euthera tenta- 
triz | have taken in New Mexico, on the Jornada del Muerto, 
in July; it belongs somewhere in the body of the ‘Tachi- 
nidex, s. str. Xysta didyma, Lw., and Himantostoma sugens, 
Lw., also belong in the body of the 'Tachinide. 
N.B.—I may be accused by some persons of taking up 
valuable space with useless data in giving the dates of speci- 
mens, male and female, separately and in such detail as 
appears in this paper; but I believe that such data, when 
exact, taken in connexion with the prevailing meteorological 
conditions, may indicate much with regard to the life- 
histories of such insects, concerning which so little is at 
