FAM. EMPIDID/E 97 
pygidial valves terminated by large quadrate infolding flaps, 
bearing long yellow sete behind which crisscross beneath the 
DIDA UMEN aee vi oeux te hau x crc FE BREVICORNIS, LOOW. 
Geographical distribution. 
. brevicornis, Loew, Berl. Ent. Zeitschr. Vol. 8, p. 83: Cent. 5, No. 65 W. North America. 
(1864); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 273, f. 87 
(1902). — PI. 8, Fig. 76. 
u 
2. H. bullata, Melander, ibidem, Vol. 28, p. 274, f. 88 (1902). Wyoming. 
3. H. copulifera, nov. sp. W. North America. 
4. H. nigricans, Loew, Berl. Ent. Zeitschr. Vol. 8, p. 83: Cent. 5, No. 66 W. North America. 
(1864); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 275 (1902). 
5. H. obliterata, Zetterstedt, Lapp. p. 540 (1838); Dipt. Sc. Vol. r, p. 257 N. Europe. 
(1842), Vol. 8, p. 3ooo (1849); Bonsdorff, Finl. tvàv. Ins. Vol. r, 
p. 145 (1861); Schiner, Fauna Dipt. Austr. Vol. r, p. 111 (1862); 
Wahlgren, Ent. Tidskr. Vol. 3r, p. 65 (1910); Frey, Acta Fenn. 
Vol. 37 (3), p. 45, pl. z, f. 5 (1913); Collin, Ent. Mo. Mag. Vol. 54, 
p. 278 (1918). 
6. H. senator, nov. sp. E. United States, 
7. H. virgator, nov. sp. W. United States. 
5b. GENUS TIMALPHES, NOV. GEN. 
Characters. — Very close to Oreogeton, but the metapleurz are bare and none of the veins is 
setulose. Strongly setose, rather large species. Eyes of the male broadly contiguous on the front, 
facets uniform and bare, face wide but short, receding into the oral cavity almost immediately below 
the antenne; antenna about as long as the head, distinctly three-jointed, the basal joints setose, the 
first joint slightly longer than the second, the third joint conical, a little more than twice as long as 
wide, its sides somewhat concave, arista terminal, longer than the third joint, thickened, geniculate at 
its articulation, the basal segment very minute and the apical seta microscopic; proboscis horizontally 
porrect, thick, palpi likewise porrect, thick and cylindrical and strongly setose; occiput with abundant 
hairs which become biseriate above as the vertical bristles, ocellar bristles four in number and small. 
'Thorax robust, no pubescence, one humeral, one posthumeral, three notopleurals, several supraalars, 
four scutellars, about ten dorsocentrals, the foremost placed outside of the row, acrostichals strong and 
biseriate; pleure entirely bare. Abdomen strongly cylindrical, somewhat bent downward, abundantly 
hairy, the basal segments marked with basal transverse, lateral longitudinal and subdiscal oblique 
series of pittings; pygidium small, the lateral valves with a forcipate pair of posterior prongs, dorsal 
valves small and hairy, penis hidden. Legs simple, hairy and bristly, femora and hind tibiae more or 
less distinctly ciliate with bristles, anterior tibiae with several sets of extensor and apical bristles, pulvilli 
large. Wings with nearly parallel sides, anal lobe rectangular, a distinct axillar angle, costa continuing 
around the entire wing, auxiliary vein complete, ending in the costa at the middle of the wing, third 
vein with a long fork, sections of the fifth vein subequal, basal cells equal and shorter than the blunt 
discal cell, anal crossvein abruptly reflexed, one-third as long as the anal cell, anal vein not continuous 
with the anal cell, extending almost to the margin; alula very weak, calypteres lobose, margined and 
with a prominent fringe. 
Tyne species : T. funosa, Hutton (Pl. 6, Fig. 53), a species described as a Clinocera. It seems 
quite likely that Meunier! s fossil Brachkystoma gracilis from the Lower Oligocene belongs to this genus. 
