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NEW YORK STATE MUSEUM 
to Loew at the time the genus was erected. Furthermore, he pro- 
posed Angelinia for the species with males possessing twice as many 
antennal segments as the females. This latter is evidently true 
or nearly true of the type species of Hormomyia. It is to be noticed 
that Loew described the antennae of the female H. dubitata 
as having the flagellate segments plainly double, though Rubsaamen 
illustrates these segments as sessile, cylindric, with a length about 
four times the diameter and with very little or no indication of a 
median constriction. 
Typical species of Hormomyia are easily recognized by their large 
size, relatively heavy structure and in particular by the mesonotum 

Fig. 39 Hormomyia americana, side view of body of male showing in par- 
ticular the greatly produced mesonotum (enlarged, original) 
being greatly produced over the head (fig. 39). The antennae of 
our American forms, some of which are provisionally placed here, 
have from fourteen to twenty-seven segments, those of the male 
binodose and provided with three low though distinctly looped, 
frequently somewhat irregular, yet very characteristic circumfila 
(fig. 40). The antennal segments of the female are equally variable 
in number, may be distinctly binodose or cylindrical and mostly 
with two rarely with three circumfila. These latter are in some forms 
at least very nearly as well developed as in the male. ‘The species 
referable to this genus vary so greatly in structure and both sexes 
