more cor 



SCIARA. 123 



;»raplete knowledge of the group, but it may be noted 

 that only forms of almost certain specific validity are described 

 here from uniques ; in all other cases more than one specimen, 

 in several, quite a fairly good series, has been before me in 

 drawing up the descriptions. 



Possibly a few may be found to be identical with European 

 species, since an exhaustive research into the descriptions of all 

 those described froui Pala?arctic regions has not been practicable. 



Table of Sj^ecies. 



1. The 1st lougitudinal vein extending as far 



as, or beyood, the fork of the 4th 

 longitudinal vein 2. 



Intermediate species, in which the 1st 

 longitudinal vein barely reaches fork of 

 4th vein, or ends distinctly and some- 

 times some little distance before it .... orientalk, sp. n.. 



The 1st longitudinal vein ending before [p. 135. 



the fork of the 4th longitudinal vein 

 (hut sometimes approximate) 15. 



2. Thoracic dorsum all yellowish, with or 



without stripes 3. 



Thoracic dorsum wholly blackish or dark 



brown . . > "• 



3. Thorax with three black stripes 4. 



Thorax unstriped ^j- 



4. "Wing surface distinctly pubescent; 1st 



longitudinal vein ends exactly at fork [p. 126. 



of 4th vein .' triUmafa, sp. n.. 



Wing surface not pubescent 5. 



6. The 1st longitudinal vein ends far beyond [p. 126. 



fork of 4th vein trifasciaUt, sp. n., 



The 1st longitudinal vein ends exactly 



opposite fork of 4th vein . . ^ opposita, sp. n., 



6. Larger species (6 mm.): wings dark brown; [p. 1-/. 



femora bright reddish yellow ; 1st longi- 

 tudinal vein extends well beyond fork 



of 4th vein distm;/i(ctHhr,sY>- ^■,_^ 



Smaller species (3-5 mm.): paler wings ; [P- ^27. 



less contrast between femora and tibiae ; 

 1st longitudinal reaches fork of 4th vein j p. 128. 



in S , beyond it in $ rnJitJwra.r, ^^'ulp, 



7 (a). Abdomen with red dorsum 8. 



(6). Abdomen with black dorsum, but sides 



or belly red or yellow 9. 



(c). Abdomen wholly black 10. 



8. Larger species (5^ mm.) : Lst longitudinal 



vein ends beyond fork of 4th vein ; [sp. n., p. 129. 



wings blackish rufoabdominalis, 



Smaller species (2| mm.) : 1st longitudinal 



vein ends exactly over fork of 4tli vein ; ^P- ^29. 



wings greyish .". hiteiventris, sp. n., 



