86 ANNALS OF SCOTTISH NATURAL HISTORY 



species extends up the west of Scotland as far as the Outer 

 Hebrides, and there is no apparent reason why that of some 

 of the southern Water-beetles should not also do so. At 

 any rate there is still a great deal to be learnt as to the 

 distribution of the Water-beetles in Great Britain and Ireland. 



BIBLIOGRAPHY. 



1. 'A Catalogue of the Coleoptera of Scotland,' A. Murray, Edinburgh, 1853. 



2. ' Re-occurrence of D. lapponicus in Mull,' J. E. Somerville in " EMM.," iv. 



230, 1867. 



3. ' D. lapponicus in the Island of Mull,' J. J. F. X. King in "EMM.," xxxii. 



(ser. 2. viii.), 1897. 



4. MS. List of Records of Water-beetles for Salen and Tobermory Districts, 



Professor T. H. Beare, 1903. 



SOME FURTHER NOTES ON NOCTURNAL 

 HYMENOPTERA. 



By P. CAMERON. 



IN the October Number of the " Annals of Scottish Natural 

 History" I gave some instances of nocturnal Hymenoptera, 

 an essentially sun- and light-loving order of Insects. A few 

 further examples of this habit may not be without interest, 

 especially as they appear to follow the rule I gave, namely, 

 that the night-haunting species were uniformly fulvous or 

 brownish in colour, and that their compound eyes and ocelli 

 were larger and more prominent than they are with diurnal 

 species. In "Nature," 1886, p. 392, the Marquis G. Doria 

 relates that the Italian traveller and natural history collector, 

 Mr. Leonardo Fea, found in Burma an uniformly fulvous 

 coloured Bombus collecting pollen or honey at night, during 

 bright moonlight. This, however, is a habit found with 

 Bojnbi in this country, especially during warm, bright summer 

 nights. It may be that the species observed by Mr. Fea 

 was not a Bombus, but Xylocopa rufescens, Sm., which is 

 found in Burma and which is, I have reason to believe, 

 more or less crepuscular in its mode of life. I have found 

 recorded two examples of nocturnal habits among the 

 Vespidce, or social wasps. Vespa doryloides, Sauss., is a 

 very different form from the normal species of the genus 



