Hubert M. Morris 293 



found could not be exactly determined. The average number of insects 

 per sample was 99-78. 



The following orders occurred in the percentages given: Collembola 

 30-84; Thysanura 1-43; Orthoptera 0-17; Thysanoptera 0-26; Hemiptera 

 0-13; Lepidoptera 0-39; Coleoptera 10-25; Diptera 18-29; Hymenoptera 

 38-22. 



The dominant order in respect of number of species present was the 

 Coleoptera, with 31 species. The numbers of species in the different orders 

 are shown in Fig. 6. 



The most abundant species were Myrmica laevinodis, which made up 

 36-3 per cent, of the total insects; Onychiurus amhulans, 13'9 per cent, 

 of the total; and Onychiurus fimetarius, 13-2 per cent, of the total. 



Six species of Myriapoda (excluding Symphyla) occurred in this plot, 

 and seventeen species of Arachnida. 



8. Soil Fauna of the Control Plot. 



The species of insects and other invertebrates present in the control 

 plot are as follows: 



INSECTA. 



Collembola. Onychiuridae. Onychiurus fimetarius (Linn.) 1-10; 0. amhulans (Linn.) 

 1-11; Tullbergia quadrispina (Born.) 3, 4, 6, 10, 11. 



ISOTOMIDAE, Isotoma viridis Bourl. 6, 9, 10; /. minor Schaff. 3, 4; FoUomia quadri- 

 oculata (Tullb.) 4; Isotomurus palustris (Mull.) 4, 10; /. palustris var. aquatilis 9. 



Entomobryidae. Entomohrya mult ifasc lata (Tullb.) 9; Le.pidocyrtus cyaneus (Tullb.) 

 1, 10, 11; L. albus Pack. 3, 4, 9; Orchesella villosa (Geoff.) 1, 6, 9, 10, 12; Heteromurus 

 nitidus Tempi. 3, 4, 9, 10. 



/206 92 \ 



Collembola. All species 1-12 ( f^; jr I • 



Thysamtira. Campodeidae. Campodea staphylinus Westw. ; C. gardneri Bagn.; C. 



fraqilis Meinert. Spp. 3-11 ( , ttt; ^ri- 1 • 



■' ^ ^^ Vl-IV'Iiy / 4 2\ 



Orthoptera. Forficulidae. Forficula auricularia L. 2, 6 I j^ttt; tt I • 



Thysanoptera. Spp. 6, 11 ( ^^ ) . 



\^/ /IN 



Hemiptera. Jassidae. Cicadula sexnotata Fall. 9 I ^ . 



/1\ ^^ 



CiMiciDAE. Lyctocoris campestris FaU. 6 1 = 1. 



Lepidoptera. Hepialidae. Unidentified larvae 2-4, 9 | ttT/J tt TTT V ) ' 



TiNElDAE. Unidentified larva 8 I ^j ) • 



Unidentified larvae 3, 4, 9 | f— p^ ; t ) . 



\I, II 1/ / J \ /1\ 



Coleoptera. Carabidae. Clivina fossor L. 4 ( ^ I ; Bembidium guttula F. 9 ( j 1 . 



Hydrophylidae. Helophorus nubilus F. 5 ( ^ I - 



Staphylinidae. Homalota spp. 2, 3, 6, 9, 10 (0^; f-^ ) 5 Tachyporus hypnorum F. 8 



