io Second Report on Economic Zoology. 
Worplesdon, and invading the rooms in great numbers, are one of 
our common mosquitoes, formerly known as Culex annulatus of 
Meigen, now placed in a new genus — Tlieobaldia (Neveu-Lemaire). 
It is especially noticeable in the autumn, and occurs over the winter, 
hibernating in houses, cellars, sheds, and under any convenient 
outdoor shelter. 
“ This particular species of mosquito has been very prevalent in 
the south and south-east of England this autumn. 1 have found them 
active during the last two weeks (December 1-14), and the snow has 
been a foot deep on the ground all the time, and there have been 
hard night frosts. As you say, it is a very vicious biter, especially 
during the cold weather. The bite is very painful, and often causes 
large swellings around the point of insertion of the proboscis. 
“ It breeds entirely in water — I have found the larvte and pupae 
in pools, in cisterns, in water-butts, etc. It does not fly any great 
distance. Eggs are laid in the summer upon the water in the form 
of ‘rafts, 7 and the larvae mature by August and September, but 
many not until October. The flies causing you annoyance have 
probably bred close to the house. It would be well to have all rain- 
barrels, cisterns, etc., looked to about July (and in August), and if 
the large ‘ wrigglers/ as the larvae are called, are present, have the 
barrels, etc., either emptied or a small quantity of paraffin put upon 
the surface of the water. This should be done again in August and 
September. 
“ The best way to clear them out of the rooms would be to fumigate 
the rooms with pyrethrum powder (Persian insect powder). You can 
often buy this insecticide made up into cones for burning, or you can 
obtain the pure powder and make it up into little cones yourself by 
moistening it. When dry burn them in the rooms with all windows 
and doors closed and leave shut up for a day. It is non -poisonous to 
man and animals, but deadly to insect life.” 
III. Mosquito annoyance ( Theobald ia annulata ) at 
Weston-super-Mare. 
Another correspondent, Mr. W. Hatchett Jackson, D.Sc., Ilad- 
cliffe Librarian at Oxford, wrote in January concerning this species 
as follows: “ This mosquito is very much dreaded at my own country 
house. I have been badly bitten by it myself and this year it has 
been so exceptionally numerous that few persons have escaped and 
some have suffered severely. The consequence of its bite may be so 
