Oct.-Dec. 1921.] 



The Canadian Field-Nat- ha fjst 



131 



It will be noticed that in (inite a num- 

 ber of cases the foregoing list of beetles, 

 small though it is, extends the recorded 

 i-ange of most of the species as given by 

 Long (3). • ' 



Order Hymknopteka. 

 The f<:'llowing were taken but mostly not 

 well enough preserved for accurate identi- 

 fication. 



Larva of a saw-fly Tenth redinidae (E. 

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



Camponotus herculeanus L (W. M. 

 Mann, U. S. Nat. Mus.) 



Nematns erichsoni Htg; Bomhus sp.; 

 Megachilf sp. ; Adrena sp. ; Sphex fragilis 

 Sm. ; Sphe.r uniaria Dahle; Chel'onus sp. ; 

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

 Mus.); Zaleptopijgus incompletus Prov. ; 

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

 Mus.). 



CLASS ARACHNIDA. 



Dictyna volupis J^eys; Cluhiona riparia 



Koch; Tetragnatha 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 probably 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 ; Galha catascopium Say ; Family Pla- 



norbidae, Planorhis hinneyi Tyron; Pla- 



norbis parvus Say ; Family Physidae, Phy- 



sa sp. ; Family Valvatidae, Valvata since- 



ra Say; Valvata leivisii helicordea, Dall; 



Valvata trkaritxata 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 tiie plants and animals obtain- 

 ed. The.se 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 numl)er, taking into account the small 

 area and the limited time, gives an idea of 

 the i)()ssibilities of the district. It repre- 

 .sents one stage in the seasonal changes of 

 the spit, since all the actual collecting was 

 done within a day or so and naturally, as 

 tlie facies of the habitat changes in the 

 passage of the year, the animals will also 

 change not only in their relations to one 

 another and to the plants and to the stage 

 of their life history but also in the actual 

 species 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 studv. 



LITERATURE CITED. 



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



Animal Ecology, New York, 1913. 



2. Gray, A. — Neiv Manual of Botany, 7th 



Edition, New York, 1908. 



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



tera of Amenca 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. CaH'Odian Field-Naturalist, 

 Vol. XXXIII, April 1919. 



5. Maeoun, 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. 



