Oct.-De^\ 1921.] 



The Canadian Field-NaT('kaijst 



131 



~ It will be noticed that in quite a num- 

 ber of cas.es the foregoing list of beetles, 

 small though it is, extends the recorded 

 range of most of the species as given l)y 

 Leng (/J). 



Order Hymexoptera. 



The f<dloAving were taken but mostly not 

 well enougli preserved for accurate identi- 

 fication. 



Larva of a saw-fly Tenthredinidae (E. 

 A. Schwarz, V. S. Nat. Mus.) 



Camponoius herculeanus L (W. M. 

 Maun, U. 8. Nat. Mus.) 



Nemaius erichsoni Htgj Bomb us sp.; 

 Megachile sp. ; Adrena sp. ; Sphex fragilis 

 Sm. J Sphex uruaria Dahle; Chelonus sp.; 

 Pteronidea sp. (S. A. Rohwer, U. S. Nat. 

 Mus.); Zaleptopijgus incompletus Prov. ; 

 Adiastola sp. (11. A. Cushman, U. S. Nat. 

 Mus.). 



CLASS ARACHNIDA. 



Diciyna volupis Keys; Clubiona riparia 

 Koch; Tetragnaiha lahoriosa Hentz; Meta 

 menardi Latr. ; Epeira trivittata Keys. 

 'C. R. Shoemaker, U. S. Nat. Mus.) 



MOLLUSCA. 



Zone L slopes up gradually from the 

 water and the slope is continued in K, but 

 it reaches its apex there and drops slightly 

 before passing over into zone J. In this 

 small inner slope of zone K, particularly 

 at the west end, are groups of the shells of 

 molluscs probabh' deposited there a year 

 or so before when the lake level was higher. 

 From these the following have been kindly 

 identified by Dr. F. C. Baker of Illinois. 

 Order Pulmonata. 



Family Lymnaeidae, Lymnaea stagna- 

 lis appressa Say ; Galha ohrussa decampi 

 Say; Gdlha catascopium Say; Family Pla- 

 norbidae, Planorhis hinneyi Tyron; Pla- 

 norbis parvus Say ; Family Physidae, Phy- 

 sa sp. ; Family Valvatidae, Valvata since- 

 ra Say; Valvata lewisii helicordea, Dall; 

 Valvata tricarinata Say. 



Order Eulamellibranchiata. 



Family Sphaeridae, Sphaerium fahale 

 Prime. 



Some of these were also taken alive but 

 all obviously occur in the water round the 

 spit. 



SUMMARY. 



Little remains to be added in the way of 

 a summary since the work itself constitutes 



a record of the plants and animals obtain- 

 ed. These include at any rate 48 plants 

 belonging to 21 families and 127 animals 

 widely scattered in different classes, be- 

 sides a number of others not identified ; 

 this number, taking into account the small 

 area and the limited time, gives an idea of 

 the possibilities of the district. It repre- 

 sents one stage in the seasonal changes of 

 the spit, since all the actual collecting was 

 done within a dav or so and naturallv, as 

 the facies of the habitat changes in the 

 passage of the year, the animals will also 

 change not only in their I'elations to one 

 another and to the plants and to the stage 

 of their life history but also in the actual 

 s})ecies present. Some species will remain 

 throughout, others will disappear and yet 

 others will be represented that were not 

 found at the time.^ Most of the species are 

 probably to be regarded as stable compo- 

 nents of the life complex of the spit, but 

 certain forms, such for example as the 

 beetle Polyphylla anxia, appear as if they 

 were simply migrants. No doubt more 

 prolonged study would have revealed fur- 

 ther species at the time and would cer- 

 tainly have added considerably to the life 

 history of the forms obtained. This in- 

 teresting spit would well repay more de- 

 tailed study. 



LITERATURE CITED. 



1. Adams, C. C. Guide to the Study of 



Animal Ecology, New York, 1913. 



2. Gi'aj', A. New Manual of Botany, 7th 



Edition, New York, 1908. 



3. Leng, C. W. Catalogue of the Coleop- 



tera of America North of Mexico, 

 New York, 1920. 



4. O'Donoghue, Chas, H. and Gowanlock, 



J. N. 



Notes on the Caspian Tern (Sterna 

 caspia) and the Parasitic Jaeger 

 (Stercorarius parasiticus) in Man- 

 itoba. Canadian Field-Naturalist, 

 Vol. XXXIII, April 1919. 



5. Macoun, J, and Macoun, J, M. Catalo- 



gue of Canadian Birds, Ottawa, 

 1909. 



6. Rydberg, P. A. Flora of the Rocky 



Mountains and Adjacent Plains, 

 New York, 1917. 



7. Shelford, V.E. Animal Communities 



in Temperate North America. Chi- 

 cago, 1913. 



