1 16 Observations on the various Insects 



A mite named Acarus farince also swarms in the spring in 

 diseased potatoes. 



They love damp, and a small degree of heat will hill them.. 



Three or 4 different larvce^ the produce of little Rove-beetles, 

 &c., which probably feed on the mites, are generated in decom- 

 posing potatoes. 



A Rove-beetle, called Oxytclus nitidulus, is a constant inha- 

 bitant of decomposing vegetables. 



Nests of little beetles, Abrceus minutus, in rotting potatoes. 



Trichopteryx rugulosa, one of the minutest of beetles, also 

 resides iji diseased potatoes. 



A little gnat, Psychoda nervosa, bred in multitudes from 

 rotten potatoes in the spring. 



The swarthy flies, Sciara fiicata^ S. quinquelineata, and S. 

 pulicaria? hatched in multitudes from the same tubers which 

 supplied food for their maggots. 



Scathopse punctata? another small fly, was bred with them. 



48 examples of a large fly, Musca stabidans, were bred from a 

 single potato in August, and 



58 of another fly, Anthomyia tubejvsa, from the same rotting 

 tuber. 



These and a closely allied species are produced from maggots 

 which are occasionally voided in vast quantities from the stomach 

 and intestines of man. 



Are they not introduced into the stomach with badly or partially 

 coohed vegetables ? 



Drosophila cellaris, the Cellar-fly, also came forth from the 

 same potato as the last-named flies. 



Limosina geniculata is another fly I have hatched from putrid 

 potatoes and L. Payenii also in France. 



A parasitic fly, Paramesius brachialis, is often bred where the 

 iore^oin^ Jiies are generated. 



Larvae of a fly, Dilophus febrilis, also infests the tubers in the 

 ground. 



Chelifer in(Bqualis, a false- scorpion, also resorts to decaying 

 potatoes, probably io feed upon the mites. 



A worm, called Vibrio or Rhabditis tuber cxdorum, is generated 

 in vast numbers in putrifying potato-heaps. 



EXPLANATION OF PLATE U. 



Fig. 1.* Aphis FabcB, female. 



Fig. 2. The natural size. 



Fig. 3.* Pupa of Aphis Fabce. 



Fig. 4. The natural size. 



Fig. o.* Hylophila Nemorum. 



Fig. 6. The natural size. 



