246 DIPTERA- 
Austr. Vol. 1, p. 85 (1862); Lioy, Atti. Instit, Ven. 1864, p. 722 (1864); Róder, Wien. Ent. 
Zeitschr. Vol. 6, p. 169 (1887); Coquillett, Proc. U. S. Nat. Mus. Vol. 18, p. 389 (1895); Willis- 
ton, Man. N. Amer. Dipt. p. 75 (1896); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 238 
(1902); Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 246 (1903); Proc. U. S. Nat. Mus. Vol. 37, 
P. 509 (1910). 
Leptosceles, Haliday, Ent. Mag. London, Vol. r, p. 160 (1838); Coquillett, Proc. Ent. Soc. Wash. 
Vol. 5, p. 252 (1903); Proc. U. S. Nat. Mus. Vol. 37, p. 560 (1910). 
Characters. — Small, slender, delicate, dark colored, rather shining species with brown wings 
marked with hyaline spots, with strong bristles and with simple legs. Head produced downward, the 
neck attachment located high up on the occiput so that the head is borne projecting obliquely forward, 
the mouth-opening at the end of the head and not on the lower side as in Hemerodromia, | Occiput with 
radiating bristles, those above long, one pair of proclinate frontoorbitals, ocellar bristles strong, curving 
upward and spaced apart as much as the posterior ocelli, no lesser or postvertical bristles; front very 
short and broad, the ocelli on a large prominent tubercle, face tapering beneath, cheeks narrow ; eyes 
large and ovate, the emargination at the antennz small, facets uniform, densely short-hairy ; antennze 
not quite touching, short and three-jointed, the second and third joints globular, the thickened arista 
not hairy, bending downward, two-jointed but the basal segment minute; proboscis very short, thick, 
palpi minute, curving forward. Thorax elongate, the prothorax visible from above, the prosternum 
rather long but not flared out around the base of the coxe and not sulcate medially; bristles long, 
comprising one humeral, one posthumeral, no notopleural, one supraalar, one small postalar, five 
dorsocentral and two scutellar; metapleurz with a group of upturned hairs, sparse in irrorata. Abdomen 
depressed, shining, more or less hairy, pygidium rather small but robust, turned back over the small 
last two segments, comprising a ventral hood-shaped piece, two lateral valves and two chitinized 
superior forcipate valves, the penis with thickened base and circularly curved end; no ovipositor, the 
end of the female abdomen blunt. Legs unarmed, the front coxze half as long as their femora, no 
bristles or tibial spurs but the front and hind tibiz tipped with a pecten of close fitting setule, pulvilli 
small, empodium linear. Wings cuneate, no anal angle, costa encompassing the entire margin, a 
strong basal costal bristle, costal setulaee minute, fringe of the hind margin longer than the anterior 
crossvein; auxiliary vein complete, ending by a gentle curve in the costa, first vein ending before the 
middle of the wing, no stigma, longitudinal veins more or less undulating, three submarginal cells, 
the fork of the third vein angulate and there connected with the second vein by an adventitious 
crossvein, second basal cell small, the fourth vein originating near the middle of the anal cell, discal 
cell long, complete, emitting three separate posterior veins, anal cell a little shorter than the second 
basal, apically round, no anal vein. 
Type species : D. irrorata, Fallen (Pl. 3, Fig. 24). Macquart gave a very clear description of 
Dolichocephala with its single species, maculata, which in the same paper he determined as a synonym of 
irrorata, Later he redescribed the genus as Ardoftera. The species of this genus are delicate little flies 
that frequent damp shady woods near water. They are not common, never occurring in swarms. 
Geographical distribution. 
1. D. argus, nov. sp. (1). Washington. 
2. D. combinata, Becker, Ann. Soc. Ent. France, Vol. 83, p. 122 (1914). E. Africa. 
(1) Dolichocephala argus, nov. sp. — Male and female. Length2 mm, Shining, bronzed black, wings with 
numerous round white spots, discal cell long, halteres black, Vertex lightly dusted with brown pollen and marked with a 
cinereous Y-shaped spot which starts at the neck and includes the ocellar prominence ; frontoorbital bristles proclinate, the 
