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4. Sandy quarries. The latter differ by the small
number of midges present there. There we observed a few
odd larvae and pupae of the nubeculosus and salinarius
groups.

5. Brooks originating from springs. Here we found
larvae and pupae of the C. nubeculosus, C. puncticollis and
C. rethi.

Salt lakes. The Rapno, Slepno and Veisovo lakes have
in places sloping banks. In the vicinity of the silty banks
and in accumulated filar algae near the banks we have
collected, in mass, larvae and pupae of the C. riethi. In
Specimens from an area of 200 cm2 (20 x 100 cm) we found
up to 1000 larvae and pupae.

Valleys along the Bakhmut river. In the temporary
water bodies and bogged area we have found larvae of the
nubeculosus group.

IV. The interfluve.

The interfluve of the Severskij Donetz river basin and
its tributary rivers, namely, the Kazennyj Teretz and Bakhmut
are characterised by the absence of large natural basins.
The breeding areas are artificial ponds of various dimensions,
formed from spring and brooks, small pools of stagnant water
along the banks of the brook, and excavations holes.

1. Ponds. The large pond of the Malinovka village.
In certain areas the pond has steep banks alternating with
sloping banks, the soil is silty. The vegetation grassy.
Among specimens found on the sloping banks, we found in large
numbers larvae and pupae of the C. puncticollis, C. nubeculosus
and larvae of the salinarius group. A similar pond
in the Tikhonovka village also proved to be an area of mass
breeding of the larvae and pupae described above.

2. Brooks. From the pond in the Malinovka village
flows out a brook approx. 1.5 m in width. The current is
strong, the bottom of the brook is sandy, banks have
accumulated much silt and in places are overgrown with grass.