186 The Myriapoda of Cambridgeshire 



summer. There seems, however, to be rather a wide 

 of difference in different localities for the breeding season. 

 I found that in Cambridge and the surrounding localities the 

 Julidae breed in June and July, Polydesmus at the same time, 

 Lithobiidae somewhat later (in July, August, and September). 

 A friend of mine in South Wales informs me that he has found 

 Polydesmus, Glomeris, and Julus breeding as early as March, 

 while in the extreme north of Scotland 1 have found the eggs 

 of Polydesmus as late as October. All the Diplopods that 

 I have observed myself form nests in which they lay their 

 eggs, while Lithobius, which is the only Chilopod that I have 

 had an opportunity of observing, lays its eggs singly. 



A list of the British species, noting the other countries in 

 which they have been found, will enable us to distinguish 

 those which inhabit the more northern countries from those 

 which are common in the warmer climates and only occur 

 rarely in the northern latitudes. 



Of the genus Scolopendrella only one species has been 

 found in Britain: Scolopendrella immaculata. This species 

 has also been recorded in Russia and Germany. 



Of the Pauropidae there are two British species : Pauropus 

 liuxleyi, England, Germany, and Russia, Pauropus peduncu- 

 latus, England, Germany, and Russia. 



Of the Pselapsognatha one species, Polyxenus lagurus, has 

 been found in Ireland by Carpenter. This species belongs to 

 the south of Europe and becomes rarer as the more northern 

 climates are reached, which renders it probable, in my opinion, 

 that the solitary specimen found was imported from another 

 country. 



The Chilognatha have been divided by Pocock into Onis- 

 comorpha, Limacomorpha, and Helminthomorpha. 



1. Of the Oniscomorpha the only representative is 

 Glomeris marginata, Leach, which is fairly common in the 

 South of England and Wales, and has been found in Ireland 

 by Carpenter. It has also been found in France, Germany, 

 and Italy. I have not found any record of its occurrence in 



