EMPIDIDAB AND PIPUNCULIDAE. 



181 



Thoracic pubescence longer, noticeably so behind the pair of strong dorso- 

 central bristles. 



Legs paler ; front legs, hind trochanters and basal third to half of hind 

 femora yellow, hind tarsi somewhat tawny. Pubescence longer, especially so 

 behind front tibiae, behind first joint of front tarsi, behind middle tibiae (where 

 some hairs stand out almost as fine bristles), and beneath hind femora 

 and tibiae, some hairs beneath latter being also almost like fine bristles. 

 Hind femora with an extra dorsal bristle near tip, close to the more apical of 

 the two usual anterodorsal bristles. 



Wings with stigma not quite so dark as in 'S. alienus, longer and not so 

 quadrate, its length fully equal to half distance along costa between subcostal 

 and radial veins. Middle cross- vein about its own length from base of discal 

 cell. 



Length about 2-5 mm. 



Type and 4 paratypes. — Upolu : Malololelei (Buxton and Hopkins). 

 Savaii : Salailua, and Safune, rain forest, 2,000-4,000 feet, v.1924 (Bryan). 



3. Syneches brevispinus, sp. n. 



Eesembling S. alienus in shortness of pubescence and shape of 

 pterostigma, and S. devius in colour of legs. 



Ocellar bristles somewhat shorter than in S. alienus and very much shorter 

 than in S. devius. 



Thoracic pubescence about as in S. alienus. 



Pubescence on legs shorter than in S. alienus, especially behind front tibiae 

 and beneath hind tibiae. All bristles much shorter ; anterodorsal bristle on 

 middle tibiae about one-third of length of that in S. alienus (only about half 

 length of first tarsal joint), and bristle behind middle tibiae very short. Antero- 

 ventral bristles on hind femora more numerous and short, that nearest base 

 close to base of femur ; no dorsal bristle towards tip of hind femora such as is 

 present in S. devius. Anterodorsal bristle on hind tibiae very short. Colour 

 of legs similar to that in S. devius, but hind tibiae broadly yellow about base. 



Pterostigma quadrate, very distinct, deeper than in S. alienus ; radial vein 

 curved downward opposite stigma to accommodate it, and therefore more 

 undulated than in S. alienus. Middle cross- vein barely its own length from 

 base of discal cell. 



