Sessional_Paper_1902 — Page 842

N.

Probably a new species.

Wings smoky, owing to thick black scales on veins, unspotted.

Legs black, unbanded.

Antennæ, palpi, and proboscis black.

Thorax black.

Abdomen dark brown. Unbanded

Length, 5 mm.

0.

Probably a new species.

743

Wings unspotted, transparent, with dark scales on veins.

Legs black, with white bands on bases of tarsi.

Antennæ grey.

Thorax brown. Abdomen brown.

Length 4 mm.

Palpi black, and in the male with white band at middle. Proboscis dark brown.

Unbanded.

There is a variety of this insect with a darker thorax and abdomen, greenish-black in colour.

Probably Culex Fuscanus (Wiedemann;.

Wings unspotted. Dark owing to thick covering of large scales on veins.

Legs brown, uubanded.

Antennæ grey. Palpi and proboscis brown.

Thorax brown, with grey tomentum.

Abdomen black, with faint grey bands at bases of segments.

Length, 4 mm.

R.

Under "" I have included two small dark species, which to the naked eye look alike, but show marked differences on examination with a lens. I shall describe them as "r" and "p1.”

R.-Probably a new species.

Wings unspotted. Veins thickly covered with dark scales. Legs dark brown, unbanded.

Antennæ, palpi, and proboscis dark brown.

Thorax very dark brown. Fine linear markings of grey hairs. Abdomen black. With faint grey bands at bases of segments. Length, 34 mm.

R'.

Probably a new species.

Wings unspotted, transparent. Veins almost nude.

Legs dark reddish brown, unbanded.

Antennæ, palpi and proboscis black.

Thorax black. Faint pale linear marking.

Abdomen black, unbanded.

Length, 4 mm.

S.

Probably a new species.

Wings unspotted, greyish, with dark scales on veins.

Legs dark, with whitish femur, and white bands at bases of tarsi.

Antennæ greyish. Palpi white-tipped in female, with white bands in male. Proboscis black. Thorax dark reddish-brown, with white spots on sides.

Abdomen black, unbanded.

Length, 24 mm.

APPENDIX III

Directions for the Destruction of the Larca of Mosquitoes, embodied in a General Order to Officers in charge of Police Stations, 22nd June, 1901.

The one great principle to act on is to prevent or abolish all stagnant water.

Careful search should be systematically made in the neighbourhood of all dwellings for any vessels that might contain stagnant water from rain or any other source; and arrangement should be made to keep them empty, or to have them emptied, or the water changed, once a week.

If running streams or ravines be anywhere near a station, efforts should be made to confine the water to a central channel. Side pools should be filled up; rock hollows should be smoothed out by cement or concrete, or a channel should be made from them by means of hammer and chisel; and a ready exit, or drainage under ground, should take the place of all oozings of water from the ground surface.

Where this guiding principle cannot be applied, or until it can be applied, still or stagnant water surfaces should be systematically inspected for the presence of larvæ of mosquitoes, and measures adopted to destroy them. This is most conveniently done in this locality by sprinkling the water surface with kerosene oil. The oil spreads in a very thin layer. over the surface, and prevents the larvae from rising to breathe the air, which results in their speedy death. tea-spoonful of oil to each square yard of water surface is sufficient, and, if there is little movement of the water, once a week is often enough.

About one

As the colour of the larva assimilates itself to the colour of the water it inhabits, the larvæ cannot usually be easily seen in the water pool itself It is necessary to dip up the water with a rapid dip of a large spoon or a saucer.