THE FAUNA OF SCOTLAND, 



WITH SPECIAL REFERENCE TO CLYDESDALE AND 

 THE WESTERN DISTRICT. 



HYMENOPTERA.— Pakt II. 



SUPPLEMENT TO TENTHRED INID AE. 

 During the six years which have elapsed since the appear- 

 ance o£ the first part of this work, I have been able to make 

 considerable additions to our knowledge of the Scottish 

 species of Tenthredimdae, — the total number of species 

 being increased from 209 to 268, and the Clydesdale 

 species from 146 to 178. The chief additions have been in 

 Tenthredo2osis, Dolerus, and Nematiis, while one genus 

 (Fenella) has been added. These additions are principally 

 from the Western district, which has now a greater number 

 of species recorded from it than the Eastern ; but as the 

 Western district has been better explored than the Eastern, 

 it would be premature to conclude from our present infor- 

 mation that the Western is the richer of the two in species. 



Our present knowledge shows that Scotland has, roughly, 

 about two-thirds of the total British species, and 47 less 

 than England. A comparison of the table on p. 63 will 

 show that the latter country is much richer in species of 

 Macrophya, Allantus, Dolerus, Hylotoma, and Cephue, all 

 (with possibly the exception of Dolerus) more particularly 

 Southern genera. The great scarcity of species of Cephus 

 in Scotland is very remarkable. 



Our knowledge of the distribution of Sawflies in Britain 

 is so meagre that it would be idle to draw any conclusion 

 from the data I have tabulated. I believe, however, that I 

 shall not be far wrong if I express the belief that an increase 

 of workers in England and Scotland will show that many 

 species now known only from one country are common to 

 both ; that some species of wide European distribution, but 



