316 DIPTERA 
Phoroxypha, Rondani, Dipt. Ital. Vol. r, p. 146 (1856); Bezzi, Bull. Soc. Ent. Ital. Vol. 3o, p. 153 
(1899); Bigot. Ann. Soc. Ent. France (6), Vol. 9, p. 124 (1889); Coquillett, Proc. Ent. Soc. Wash. - 
Vol. 5, p. 255, 261 (1903). : 
Tachydromia (of authors), Meigen, Illiger's Mag. Ind. Vol. 2, p. 269 (1803); Syst. Beschr. Vol. 3, p. 67 
(1822); Zetterstedt, Fauna Ins. Lappon. p. 548 (1838); Dipt. Scand. Vol. 1, p. 138(1842); Ron- 
dani, Dipt. Ital. Vol. t, p. 146 (1856); Loew, Zeitschr. Ent. Breslau, Vol. 17, p. 4 (1863); 
Williston, Man. N. Amer. Dipt. p. 75 (1896); Becker, Mitteil. Zool. Mus. Berlin, Vol. 2, p. 42 
(1902); Bezzi, Kat. Palarkt, Dipt. Vol. 2, p. 279 (19093); Frey, Zeitschr. Hym. Dipt. Vol. 7, 
P. 407 (1907); Bezzi, Nova Acta Akad. Naturf. Halle, Vol. 91, p. 30o, 402 (1909); Wahlgren, 
Ent. Tidskr. Vol. 31, p. 45, 112 (1910); Lundbeck, Dipt. Dan. Vol. 3, p. 285 (1910); Brunetti, 
Fauna Brit. Indian Dipt. Vol. 1, p. 374 (1920). : 
Characters. — Usually robust, and with sturdy legs, the middle femora more or less incrassa- 
ted and biseriately setulose or spinose beneath, the middle tibize shorter than their femora, raptorial, 
uniseriately setulose beneath and terminating within in a more or less developed spur : in color usually 
black though some species are testaceous. — Head globular, sometimes a little higher than broad, the 
front broader than the face, but of variable breadth, sometimes with parallel sides sometimes diverging 
above, cheeks linear; eyes reniform, facets uniform; palpi flat and broadly oval, appressed to the 
proboscis, usually with one or two apical setze, the front side with short incumbent hairs, the inner side 
glabrous; proboscis vertical, shorter than the head. — Antennz close together, located near the middle - 
of the head, two- or three-jointed, the second joint globose, with a whorl of minute hairs, the third joint 
compressed, varying from short ovate to subulate, slightly pubescent, and always with a terminal arista 
which is closely but briefly pubescent.  Ocelli three in number, placed on a low tubercle, one pair of 
proclinate ocellar bristles, in back of which are sometimes a pair of minor setule; one or two pairs of 
vertical bristles differentiated, the upper occipital setulze usually dark, the lower more abundant and 
white, Thorax quadrate, the dorsum slightly convex, humeri rather distinct, thorax usually dusted, 
typically with a shining glabrous space on the sterno-pleurz, sometimes the disk of the mesonotum 
devoid of pollen and highly polished, rarely densely pubescent, usually with biseriate acrostichal setulge 
and uniseriate dorsocentral and sparse lateral setulze, the hindmost dorsocentral setiform, chatotaxy 
including one or two humeral bristles, one or several notopleural, one supraalar, one postalar, two or 
four scutellar bristles, the lateral scutellars small. Abdomen with eight segments, shining, rarely with 
pollinose fasciz or lateral markings, the subdorsal and lateral pittings sometimes evident though usually 
not noticeable on the shining integument, hairs sparse but moderately long; ovipositor short, shining 
or pollinose; pygidium more or less globular, asymmetrical, closed, comprising a spherical lower piece, 
covered by a dorsal usually fringed valve. Legs without true bristles, but the middle femora sometimes 
seriately setose along the postero-flexor face and less evidently so along the anterior surface, the front 
femora with more or less developed biseriate flexor cilia, tibize without apical setze, last tarsal joint a 
little flattened, tarsi unusually long in Cleftedromia. | Calypteres fringed with a few cilia; halteres never 
black. Wings hyaline or nearly so, not pictured but sometimes clouded, tip of first vein and costa 
between the first and third veins sometimes thickened, first vein ends beyond the middle of the wing, 
third vein straight or recurved toward the fourth, crossveins approximate, usually when the crossveins 
meet on the fourth vein the posterior crossvein is nearly transverse but when the posterior crossvein is 
located beyond the anterior it is distinctly oblique, anal crossvein angularly projecting from the fifth 
vein, the anal vein always faint but visible for more or less of its course, axillary lobe somewhat 
developed but obtusely rounded. 
