482 TROMOPTERA 



sometimes extended dorsally into an anterior thoracic shield, 

 on which are some very strong bristles. Thorax and abdomen 

 often with scaly pubescence. Toxophokin^ (p. 509). 



8 (1) Prtefurca long (figs. 305, 306), and the cubital vein apparently 

 emitting the radial vein rectangularly (or at least abruptly) 

 nearly opposite the middle of the discal cell and very close to 

 the discal cross-vein (unless the latter be placed near the end 

 of the discal cell). Eyes often with an indentation at the middle 

 of the hindmargin. Antennae always widely separated at the 

 base. Frons often very little narrowed in the male. Abdomen 

 usually oblong. ANTHRAClNiE (p. 515). 



As far as British species are concerned we have only to deal with the 

 Bomhylince and Anthracince, and our species are easily distinguished by 

 the different divergence of the radial and cubital veins. The other sub- 

 families have never been well differentiated and considerable difference of 

 opinion may arise as to their limitations; I have dealt with this subject 

 in some detail under the family and subfamily characters, but my work 

 is merely of a tentative nature owing to my studies in this family having 

 been but slight and superficial. Many genera of Bomhylidrc are in- 

 sufficiently characterised, and my hasty studies for this work have already 

 suppressed two {Eniconeura and Stomylomyia). 



