Letter XXXIVTo Thomas Pennant, EsquireSelborne, March 30, 1771.Dear Sir,There is an insect with us, especially on chalky districts, which is very troublesome and teasing all the latter end of the summer, getting into people’s skins, especially those of women and children, and raising tumours which itch intolerably. This animal (which we call an harvest-bug) is very minute, scarce discernible to the naked eye; of a bright scarlet colour, and of the genus of Acarus. They are to to be met with in gardens on kidney-beans, or any legumens; but prevail only in the hot months of summer. Warreners, as some have assured me, are much infested by them on chalky downs; where these insects swarm sometimes to so infinite a degree as to discolour their nets, and to give them a reddish cast, while the men are so bitten as to be thrown into fevers.There is a small long shining fly in these parts very troublesome to the housewife, by getting into the chimneys, and laying its eggs in the bacon while it is drying: these eggs produce maggots called jumpers, which, harbouring in the gammons and best parts of the hogs, eat down to the bone, and make great waste. This fly I suspect to be a variety of the musca putris of Linnaeus: it is to be seen in the summer in the farm-kitchens on the bacon-racks and about the mantelpieces, and on the ceilings.The insect that infests turnips and many crops in the garden (destroying often whole fields while in their seedling leaves) is an animal that wants to be better known. The country people here call it the turnip-fly and black dolphin; but I know it to be one of the coleoptera; the ‘chrysomela oleracea, saltatoria, femoribus posficis crassissimis.’ In very hot summers they abound to an amazing degree, and as you walk in a field or in a garden, make a pattering like rain, by jumping on the leaves of the turnips or cabbages.There is an oestrus, known in these parts to every ploughboy; which, because it is omitted by Linnaeus, is also passed over by late writers, and that is the curvicauda of old Moufet, mentioned by Derham in his Physico-theology, p. 250: an insect worthy of remark for depositing its eggs as it flies in so dexterous a manner on the single hairs of the legs and flanks of grass-horses. But then Derham is mistaken when he advances that this oestrus is the parent of that wonderful star-tailed maggot which he mentions afterwards; for more modern entomologists have discovered that singular production to be derived from the egg of the musca chamaeleon: see Geoffrey, t. 17, f. 4.A full history of noxious insects hurtful in the field, garden, and house, suggesting all the known and likely means of destroying them, would be allowed by the public to be a most useful and important work. What knowledge there is of this sort lies scattered, and wants to be collected; great improvements would soon follow of course. A knowledge of the properties, oeconomy, propagation, and in short of the life and conversation of these animals, is a necessary step to lead us to some method of preventing their depredations.As far as I am a judge, nothing would recommend entomology more than some neat plates that should well express the generic distinctions of insects according to Linnaeus; for I am well assured that many people would study insects, could they set out with a more adequate notion of those distinctions that can be conveyed at first by words alone.
To Thomas Pennant, Esquire
Selborne, March 30, 1771.
Dear Sir,
There is an insect with us, especially on chalky districts, which is very troublesome and teasing all the latter end of the summer, getting into people’s skins, especially those of women and children, and raising tumours which itch intolerably. This animal (which we call an harvest-bug) is very minute, scarce discernible to the naked eye; of a bright scarlet colour, and of the genus of Acarus. They are to to be met with in gardens on kidney-beans, or any legumens; but prevail only in the hot months of summer. Warreners, as some have assured me, are much infested by them on chalky downs; where these insects swarm sometimes to so infinite a degree as to discolour their nets, and to give them a reddish cast, while the men are so bitten as to be thrown into fevers.
There is a small long shining fly in these parts very troublesome to the housewife, by getting into the chimneys, and laying its eggs in the bacon while it is drying: these eggs produce maggots called jumpers, which, harbouring in the gammons and best parts of the hogs, eat down to the bone, and make great waste. This fly I suspect to be a variety of the musca putris of Linnaeus: it is to be seen in the summer in the farm-kitchens on the bacon-racks and about the mantelpieces, and on the ceilings.
The insect that infests turnips and many crops in the garden (destroying often whole fields while in their seedling leaves) is an animal that wants to be better known. The country people here call it the turnip-fly and black dolphin; but I know it to be one of the coleoptera; the ‘chrysomela oleracea, saltatoria, femoribus posficis crassissimis.’ In very hot summers they abound to an amazing degree, and as you walk in a field or in a garden, make a pattering like rain, by jumping on the leaves of the turnips or cabbages.
There is an oestrus, known in these parts to every ploughboy; which, because it is omitted by Linnaeus, is also passed over by late writers, and that is the curvicauda of old Moufet, mentioned by Derham in his Physico-theology, p. 250: an insect worthy of remark for depositing its eggs as it flies in so dexterous a manner on the single hairs of the legs and flanks of grass-horses. But then Derham is mistaken when he advances that this oestrus is the parent of that wonderful star-tailed maggot which he mentions afterwards; for more modern entomologists have discovered that singular production to be derived from the egg of the musca chamaeleon: see Geoffrey, t. 17, f. 4.
A full history of noxious insects hurtful in the field, garden, and house, suggesting all the known and likely means of destroying them, would be allowed by the public to be a most useful and important work. What knowledge there is of this sort lies scattered, and wants to be collected; great improvements would soon follow of course. A knowledge of the properties, oeconomy, propagation, and in short of the life and conversation of these animals, is a necessary step to lead us to some method of preventing their depredations.
As far as I am a judge, nothing would recommend entomology more than some neat plates that should well express the generic distinctions of insects according to Linnaeus; for I am well assured that many people would study insects, could they set out with a more adequate notion of those distinctions that can be conveyed at first by words alone.