2IO 



NEW YORK STATE MUSEUM 



to L08W 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 



