32 ANNALS OF SCOTTISH NATURAL HISTORY 



TABLE IV. SECOND BELT continued. 



Spring. Summer. Autumn. 



Wasps .... . 12 



Lepidoptera, long-tongued i 14 3 



Lepidoptera, mid-tongued . . i 3 



Lepidoptera, short-tongued ... 28 



Diptera, long-tongued . 34 57 21 



Diptera, short-tongued 86 481 281 



Coleoptera ... 2 29 54 



Other Insects ... ... 2 12 



STRATHS. 



Apis . . . 160 230 4 



Bombus and Psithyrus 195 177 220 



Andrena and Nomada 2 54 i 



Chrysis and Odynerus ... 5 



Tenthredinidce . . 4 183 



Entomophaga . . 8 239 43 



Ants. . . 2 61 15 



Wasps ... 2 28 2 



Lepidoptera, long-tongued 22 236 65 



Lepidoptera, mid-tongued . ... 25 9 



Lepidoptera, short-tongued . ... 68 



Diptera, long-tongued . 121 567 225 



Diptera, short-tongued . . .3212 4331 1420 



Coleoptera . . . . 31 553 389 



Other Insects ... .13 78 77 



We propose here to discuss the changes which season and altitude 

 seem to make in the anthophilous insect fauna. 



First of all it is to be remarked that we have not been able to 

 spread our days of observation equally over the seasons. We spent 

 23 days in spring, 88 in summer, and only i 2 in autumn. There- 

 fore, to equalise our seasonal figures, we have calculated from our 

 data what the observations would be for seasons of 6 T days. Spring 

 at Clova is April and May, summer is June and July, autumn is 

 August and September, and winter begins in October. 



Of the spring days 9 were overcast, 4 showery, and i wet ; of 

 the summer days n were overcast, 12 showery, 13 wet, and 4 very 

 wet ; and of the autumn days 3 were overcast, and i wet. This is 

 about normal for these hills, where July is apt to be a wet month 

 and June not settled. Table V. is derived from Table II. by 

 equalising our periods of observations. 



TABLE V. THE VISITORS IN THE THREE SEASONS A SEASON BEING 



CALCULATED AS OF 6l DAYS' DURATION. 



Spring. Summer. Autumn. 



Apis ... . 427 184 2O 



Bombus and Psithyrus . . 721 251 1540 



Andrena and Nomada . 5 45 5 



Chrysis and Odynerus . . ... 4 



Tenthredinidce 13 136 



Entomophaga . . . 34 206 767 



Ants . . 8 120 132 



Wasps .... .5 28 10 



