78 DIPTERA 
Finl. tváv. Ins. Dipt. Vol. z, p. 157 [1861] (Cyrtoma) ; Siebke, Nyt. Mag. 
Naturvid. Vol. 12, p. 108 [1864] (Cyrtoma). 
nigra, Macquart, Mém. Soc. Sc. Lille, 1823, p. 156 (1823) ; Coquillett, Proc. 
Ent. Soc. Wash. Vol. 5, p. 246 (1903). 
19. B. ? tibialis, Roser, Correspondenzbl. Landw. Ver. Würtenb. Stuttgart, C. Europe. 
Vol. 1, p. 55 [1840] (Cyrtoma).. 
20. B. uvens, nov. sp. — PI. 8, Fig. 72f. Hudson Straits. 
14. GENUS HOPLOCYRTOMA, NOV. GEN. 
Characters. — Similar to Bicellaria in general structure and in neuration but differing in the 
possession of stout and spinose hind femora and correspondingly strong hind tibie. The hind femora 
are swollen and abundantly armed beneath with a mixture of spines and thorns. The hind tibiz are 
much shorter than the femora, not clavate but nearly straight and cylindrical, geniculate at the knee and 
carinate along the flexor edge. Apically they are somewhat obliquely truncate and closely fimbriate, 
The tines of the ventral piece of the pygidium are thick and bluntly rounded, the one on the right longer 
than the one on the left. 
Genotype : Bicellaria $rocera, Loew (Pl. 2, Fig. 1l). The two American species, frocera and 
femorata, are closely related, differing from the species of Bicellaría in the same leg specialization that has 
been repeatedly developed in various groups of the Emfidida. 
Geographical distribution. ; 
1. H. femorata, Loew, Berl. Ent. Zeitschr. Vol. 8, p. 84: Cent. 5, No. 69 E. United States. 
[1864] (Cyrtoma); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 335 
[1902] (Cyrtoma). 
2. H. procera, Loew, Berl. Ent. Zeitschr. Vol. 8, p. 85 : Cent. 5, No. 7o Alaska; Washington. 
[1864] (Cyrtoma); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 335 
[1902] (Cyrtoma). — PI. 2, Fig. Il. 
SusgBFAMILY EMPIDINZE 
Characters. — Head globular, occiput little convex, in Xanthempis drawn out to a sort of cone ; 
eyes bare except in Parathalassius and Microphorella, males dichoptic or holoptic, in the former case the 
facets are uniform or the anterior middle ones slightly enlarged, in the latter case the upper facets are 
more or less enlarged, eyes of the females always separated ; face broad, often short and receding and 
then with the oral margin arched, in specialized forms of Em?is and Rhamphomyia the face becomes 
narrow : front quadrate, often with small orbitals ; antennze three-jointed, the first joint usually as long 
as or longer than the globular second joint, in Hormofesa the basal joints fused, in Ragas the basal joints 
small, third joint conical and cylindrical, or (Gloma) reniform, or (Hormofesa) orbicular, or (Afalocnemis, 
Opeatocerata) oval, tipped with a style of two to four joints, usually the style with a quadrate basal piece 
ending in a short bristle, sometimes the end piece of the style is longer and tapers, sometimes (Gloma, 
etc.) the antenna is furnished with a long thin arista; proboscis usually fitted for piercing, corneous, 
variable in length and direction, sometimes shorter than the head, sometimes in the flower-sucking 
species nearly as long as the body, palpi single-jointed. Thorax never greatly convex, usually the 
humeral, posthumeral and supra-alar and almost always the notopleural and scutellar bristles present. 
the acrostichals and dorsocentrals variable, the former almost never pronounced, the latter usually weak; 
