Tur CRANE-Fiurrs or New York — Parr II 807 
Elliptera omissa Egg. 
1863 Elliptera omissa Egg. Verh. Zool.-Bot. Ges. Wien, vol. 13, p. 1108. 
Specimens of Elliptera omissa were found by Mik (1886b) along water- 
courses and near falls in mountainous regions. The adult flies were 
noted as late as September 10, swarming about the waterfalls. 
Larvae and pupae were found on July 30 and August 17 near Salzburg, 
upper Austria, living in elongate and somewhat depressed cocoons about 
10 millimeters long and 4 millimeters broad which were arranged in longi- 
tudinal rows with short spaces between. These cocoons, which were 
placed with the current, occurred on the wet walls of wooden chutes or 
runways and also on dripping chalk cliffs. The immature stages spend 
their existence in these small cocoons of mud and silk. When ready to 
emerge as an adult, the pupa makes its way thru the end of the cocoon 
away from the current, leaving the cast skin attached to the opening. The 
margins of the large pronotal breathing horns of the pupa are finely ser- 
rated and are presumably used in making this opening thru the cocoon. 
The young larva probably creeps about on the floor of the runway, feeding 
on algae growing in the same situation. When nearly full-grown, the 
larva crawls to a less exposed place and spins its cocoon. Many larvae 
and pupae are killed by the drying-out of their haunts when the water 
supply becomes insufficient to cover them. 
Larva.— Length, 7 mm. 
Diameter, 1.5 mm. 
Body clearly depressed (Plate XXIII, 72), greenish white, scarcely shiny, with delicate 
appressed grayish hairs which are thicker at the two ends of the body,-especially on last 
segment, where they become almost villous. Integument very transparent, so that intes- 
tine and contents show thru, the intestine narrowing on segment 6 and thru to segment 8, 
where it broadens out and almost entirely fills the ninth and tenth segments. On sides of 
prothorax a delicate, long, pale hair; on remaining segments two such hairs. On each of 
abdominal segments 3 to 9, on dorsum near anterior margin, a low transverse ridge which 
is thickly set with short, blackened points; on sternum of each of same segments, a similar 
welt which is destitute of points. In male larvae, clawlike appendages of genitalia of adults 
showing thru skin on ventral side. 
Head capsule (Plate X XIII, 73 and 74) massive, slightly longer than broad, black, some- 
what shiny, all the sclerites compact and closely united; anterior projecting part of capsule with 
margins transparent, rust-brown; median part with two small knobs, laterad of which are 
two larger projections which are crowned with short points; capsule weakly keeled behind 
on dorsum (Plate X XIII, 74), anterior to which are two swollen elevations; on hinder mar- 
gin of clypeus a styliform, bristly lobe, easily broken off, which is presumably the antenna. 
