16 DIPTERA 
in the middle of the wing, emitting two posterior veins of which the anterior is furcate in two of the 
genera, in the aberrant Tasmanian genera Ironomyia and Sciadocera there are three posterior veins and 
the basal cells are small, otherwise the basal cells long, nearly equal in extent as the anterior crossvein - 
is placed well toward the base of the discal cell, anal crossvein never recurved but continuing perpen- 
dicularly to the wing axis toward the hind margin, the anal cell, always formed, is thus longer than the 
second basal and its outer lower angle is acute. A distinct alula is present in Meghyferus. 
This subfamily is the best circumscribed of all. By the earlier writers it was considered as a 
distinct family, the Hybotide, but during the last half century it has been amalgamated with the 
Empidida. In the Hybotinz the anal crossvein, the chief character of the subfamily, continues more 
or less parallel with the hind margin so as to elongate the anal cell, but in Meghyferus it is so curved as 
to meet the anal vein almost at a right angle. 
Meghyperus forms an aberrant genus in the Hybotinz. The presence of a strong M the sepa- 
ration of the auxiliary vein, the forked fourth vein, the broad front of the female and the lack of a long 
arista, are all weighty characters at variance with the other genera and suggestive of the genus: Prorates 
Melander, which is discussed at the conclusion of this fascicle as being removed to the Bombyliidz. 
TABLE OF THE GENERA OF THE HYBOTINZE 
1. Basal cells long, discal cell present and emitting 2 posterior veins; fro- : 
boscis projecting forward. . . . . $57 CR SR II ERR REL B. 
Basal cells short, 3 bosterior veins, discal » dris or cdit: arista s 
and filiform; femora simple; Proboscis short; wings broad, costa convex  . . . . . . . . . .-— 12. 
2. Antenna wilh a long filiform arista; eyes contiguous above the antenne : 
in both sexes; hind femora oflen. swollen; discal cell emitting two 
simple posterior veins, auxiliary vein very close to (he first vein, no 
NES 0. 7 . UN NANI CE. T 
Antenne with a slyle, eyes y 9 led Me on the "dis Pe 
without bristles, hind femora slender; fourth vein forked, auxiliary 
vein distinctly separated from the first vein which passes through the 
stigma, alula present; pygidium with lateral valves (Pl. 5, Fig.40) Genus MEGnuvPeRus, Loew. 
3. Pedicel of the second and third veins long, arising before the middle of 
the basal cells; bygidium with lateral valves ; scutellum with several : 
marginal bristles or hairs. .— . "Ug o: qu t 
Pedicel of the second and. third veins sor, arising iind ihe middle 
of the basal cells; bygidium with dorsal and ventral valves; scutellum 
with two or but few marginal bristles, . . Ro Are Ue c Qu E acm) ve 
4. Hind femora slender, nol thicher nor longer than their tíbio, ddger i 
not armed beneath with sele or tubercles ; arista usually subapical ; 
middle tarsi Cf sometimes deformed ; dorsocentral, scutellar and tibíal 
bristles undevloped (Pl. |, Fig. 7). . . . . Genus PanaHYBOS, Kertész. 
Hind femora more or less swollen, thicker and. longer p fheir 
libie, and variously armed. beneath with sele, spines or. lubercles 
(Genus SvNECcHES, Walker) . . . . . Qoo. 6see euin a DE 
5. Third and fourth veins parallel or diverging ; color of ihe lody dedi 
darh or blach and the wings sometimes spotted (Pl. 1, Fig. 4) . . Subgenus SvNEcuss, Walker. 
Third and fourth veins converging, the first poslerior cell narrower at its 
apex than opposite the posterior crossvein ; color often yellow and wings 
soisholltd . 0 0k uta e - * X i. v. Quo. DDR UR E E 
