1919.] lOo 



beyond middle ; appendage of last joint shorter. Terminal lamellae of abdo- 

 men oval, barely twice as long as broad. Hairs at wing tip slightly more 

 numerous. Otherwise as in the iS . 



Length of body, O'9-l mm. ; of wing, 1"0 mm. 



The genus Leptosyna is interesting as representing the extreme of 

 vein-reduction in a fully-winged fly. The most noteworthy point about 

 our species is the presence of surface hairs at the tip of the wing, which 

 will necessitate a slight remodelling of Kieffer's definition of the sub- 

 family Heferopezinae. Presumably these hairs are absent in the two 

 species described by Kieffer, since he does not mention them, bvit 

 i. setipennis may also be distinguished from L. quercus by the radial 

 vein (cubitus of Kieffer) not reaching the tip of the wing, and from 

 L. acuiipennis by the slender femora and tibiae and the different 

 proportionate lengths of the tarsal joints. 



Zi. setipennis is one of the smallest, if not actually the smallest, of 

 British Diptera. A few species of Oulicoides and Ceraiopogon may be 

 shorter in length of body, but are of stouter build. The elongate form 

 of Leptosyna gives it a rather striking resemblance to the Mymaridae. 



56 Norton Road, Letchworth. 

 March 21s<, 1919. 



ON THE BEITISH SPECIES OP EUPELIX Germar. 

 BY JAMES EDWARDS, F.E.S. 



It has been customary to segregate specimens of this genus by 

 the relative length of the head, thus: short (cuspidata Fab.), medium. 

 (prodncfa Germ.), and long (depressa Germ.). This, however, is un- 

 satisfactory, because these insects, following the rule in Jassina, have- 

 the crown of the female distinctly longer in proportion than that of the 

 male : consequentl}^ the short-headed category comprises only the male* 

 of cuspidata. Female cuspidata and male producta, of which we are 

 certain, have the crown of medium length ; and the really long-headed 

 section, of which I have never seen a male, includes two kinds dif- 

 fering in the relative projwrtion of the last ventral segment to the 

 preceding one. 



Our present knowledge is summarized in the following table : — 



1 (2) Crown broader than long, the sides convex. Male : upper apical angle- 



of side lobes of pygofer blunt but distinct ; style broader than that of 

 producta, truncate at the apex cuspidata Fab. 



2 (1) Sides of crown not convex. 



3 (6) Crown us broad a.s lung, the sides a little indented at the ocelli. 



