45 



Atylotus rusticus, Fabr. 



In the British Islands this species is even more rare than the 

 foregoing, from which it may be distinguished by the greyer tint of 

 the short hair covering the bod)'. The dimensions are similar to 

 those of A.fidvus. The eyes of the male sometimes have a purplish 

 transverse line at the junction of the large and small facets ; similarl)' 

 those of the female are either unbanded or in some cases have a 

 single narrow band. 



The only modern British example of this species in the Museum 

 is a male from North-east Essex ( W. H. Harwood), of which the 

 date of capture is unfortunately unknown ; but a male and female 

 without locality labels are contained in the old Stevensian collection. 

 The general collection of Diptera includes specimens from France, 

 Hungary, and Algeria. The localities given b\- Brauer {loc. cit., p. 169) 

 show that the species is distributed throughout Central and Southern 

 Europe. 



Genus 

 TABANUS, Linnaeus. 



Tabanus bovinus, Lw. (.Schiner pro parte) 



Plate 19. 



This and the following species, Tabanus sudettais, Zlr. (Plate 20) 

 are the bulkiest of all British Diptera, and on the whole T. sudeticus 

 is slightly the larger of the two. Although as a rule specimens of the 

 latter species are distinctly darker than those of T. bovinus, the females 

 are often difficult to distinguish, and it is by no means easy to give 

 thoroughly satisfactory characters for their separation. The males of 

 the two species, on the other hand, can readily be distinguished owing 

 to the fact that while the facets in the upper half of the e\-e of T. 



