2i 



F. W. EDWARDS. 



Antennae.— These have been variously stated to be 10- or ll-jointed, Brunetti 

 even as late as 1913 claiming that only 10 joints are present. All the species which 

 I have examined, however, agree with Meigen's description in having ll-jointed 

 antennae. 



Fig. 1. Male genitalia of British SimuUum, as seen from beneath, all X 75, 

 (except in figs, j and I the ninth tergite has been removed) : — a, 8. ornatum ; 

 fc, S. variegatum, clasper and external part of adminiculum ; c, 8. reptans ; 

 d, 8. morsitans ; e, 8. tuberosum ; f, 8. austeni ; g, 8. argyreatum ; Ji, 8. equinum ; 

 iy 8. aureum ; j, 8. angustipes, a specimen from Wells, Som. ; k, the same, from 

 Sligo ; If the same, in a different position, from Nairn ; m, 8. latipes ; 



n, 8. suhexcisum ; o, 8. Mrtipes. 



In figs, c, df /, i, j, h, I and n the appendices superae are shown, but in the rest 



they have been removed with the ninth tergite. 



Mouth-parts. — These have never been very accurately described, the best description 

 still being that of Meinert in his well-known paper on the mouth-parts of Diptera. 

 It has sometimes been stated that in Simulium the mouth-parts of the male are 



