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 body. The dimensions are similar to 
those of A.fulvus. The eyes of the male sometimes have a purplish 
transverse line at the junction of the large and small facets ; similarly 
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 by 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 sudeticus, 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 eye of T. 
