
            -5-
composition of midges was also observed in lakes of larger
dimensions (150 x 80 m) with its banks overgrown with grass
and fluvial oak forest, but the number of larvae and pupae
of midges here was substantially less.

2. The intermittent impounded lakes, drying up at the start
of summer. Such water bodies form in the low-lying plains
and get filled up with flood-water. The vegetation here is
grassy and meadow bog type with some additional moss. These
water bodies are in the open and are well heated by the sun.
In such impounded lakes we found, in not very large quantities,
larvae and pupae of the C. homochrous, C. vexans, C. reconditus
C. punctatus, C. simulator, C. odibilis and C. fascipennis.

3. Swamped perennial shallow and not very extensive
basins situated on a damp meadow and damp soil.
The vegetation here consists of sedge and it is grassy with
moss. The water gets heated well, but is colder than the
previously described type of biotop as a result of interflow
with subsoil waters. The soil is sandy-silt or silt. In
these biotops we discovered pre-imago phases of the C. salinarius, 
C. circumscriptus, C. manchuriensis, C. vexans,
C. reconditus, C. punctatus, C. ustinovi and C. fascipennis.

4.  Stagnant brook. The flow of water is very poor or
else altogether absent. Heavy growth of magnificent aquatic
vegetation, sedge and in places there are rushes growing.
In summer some portions of such brooks dry up turning the
brook into a chain of small stagnant water bodies. The areas
without water almost always remain moist. We determined
C. salinarius, C. circumscriptus, C. manchurensis, C. punctatus 
and C. odibilis.

5. Pond-excavation. Not very large, the soil is
sandy-silt, the water gets well heated. The bank in
places is overgrown with reeds. There are many stringy algae,
We have discovered, in a mass, larvae and pupae of the group
of nubeculosus and salinarius; a few odd larvae and pupae
of the C. odibilis were also uncovered.

Fluvial of the Kazennyj Toretz river. The main part of
this fluvial, in the area under study, is plowed up and is
under cultivation. Only a meadow approx. 3 km in length
and some 0.5 km in width has been preserved in the lower
contour. In spring this area gets filled with the flood or
melted show [snow] water, which remains till the end of June-
beginning of July. at this stage there are small bodies of
        