Thysanura 2 59 



From adults collected in the fall a number reared in the laboratory- 

 survived during the following summer and most of the fall. Adult males 

 and females, when observed copulating, and in some cases males and 

 females not pairing, were isolated in separate receptacles. In most cases 

 the females laid eggs in cavities made by themselves a short distance 

 below the surface of the soil. These were permitted to hatch in the same 

 receptacle with the adults. As soon as the larvae started emerging from 

 the eggs, a number of them were placed in petri dishes in order to observe 

 their habits more accurately. 



M. E. D. 



Order symphyla 



REARING OF SCUTIGERELLA IMMACULATA* 



THIS garden centipede will live on a wide range of vegetable matter 

 and probably on decaying vegetable matter within the soil. 



Eggs are laid during the early part of the summer in the subsoil run- 

 ways of the creatures, usually in clusters of 4 to 20. At room tempera- 

 tures the eggs hatch in about 14 days. When the larvae first hatch they 

 have 6 pairs of legs. One pair is added at the first molt, which occurs in 

 1 to 4 days, and a pair is added at each successive molt, occurring 7 to 

 14 days apart, until each individual has 12 pairs. 



Rearing of these creatures is done in petri dishes on a thin layer of 

 soil and in stender dishes into which is poured a "muck-plate" made 

 by mixing 10 parts plaster of Paris and 3 parts of finely ground muck. 

 This mixture makes it easy to find the white eggs and to observe the 

 whitish creatures as they move about. Lettuce leaves are placed on the 

 surface of the plates for food and as a hiding place. Rearing records 

 show that individuals may live n or 12 months. 



M. E. D. 



Class Insecta, Order thysanura 



REARING OF THYSANURA 



G.J. Spencer, University of British Columbia 



Campodeidae. These are difficult to rear because they are extremely 

 sensitive to changes in moisture. A large volume of greenhouse potting 

 soil or compost in a big tin box with a tight-fitting lid, will keep a colony 

 going for a few weeks. 



Machilidae. These are also unsatisfactory to rear. The coastal species 



♦Abstracted from an article in /. Econ. Ent. 21:357, 1928, by George A. Filinger, 

 Ohio Agricultural Experiment Station. 



