94 H. C. EFFI.ATOUN. 



Sy\0XY3jy:—?caffra T.w., Œfv. Kong]. Vet. Akad. 

 l'orliandl., XIV. 1857.380.27. {Helophllus) (1858) et DiiJterenf. 

 Sudafr., I. 312. 1. {Helophilu^) (1860); K.\rsch. Berlin. Entom. 

 Zcitsfhr., XXXr. 381.51. {HdnphUns) (1887). 



I)J.[(;\0S1S:— A fairiy lai go and liaiidsoine Ily whieh is 

 casily di.stinguishcd by its wing vsnation (cell Ri open), the tuft 

 of glohit'crous Jiairs on the joint between tho liind tibiœ and tarsi 

 ol' the in;ilc and hy its brighl colouf. 



DESCRIPI lOS:-^ Mah.- J'acs tovcrcd with shilling pale 

 ycllow dust and hairs except in the shallow liollovv belcw the antennœ 

 and on a rather shiniiig médian black stripe whicli extcnds lo the 

 rallier produced moutli ; frnns also covcrsd with pale yellow shi- 

 ning dust and hairs (sonietimes it is ahnost pure silvery-white) 

 o.xccpt for a sniall shining brown and bare triangular ijiece at the 

 base of the antcnnœ ; the light y?llow hairs on the frons are tnore 

 scattcred and Icss nunierous than en the face ; vertex black with 

 some blackish hairs and the front third of the vertical triangle 

 with yellow dust ; occiput entirely covered with yellow dust and a 

 few very short, pale and inconspicuous hairs above. Eyes black, 

 bare, not quite meeting. Antennas blackish and the third joint 

 which is not long possesses a bare, simple, dark brown arista ; the 

 two basai joints possess some black, erect bristles and those on the 

 second joint are longer. 



Thorax dull black, with five cons]Mcuoas longitudinal stripes, 

 made of orange-yellow dust ; the central stripe is by far the 

 narrowest and reaches only half way dcwn the dise ; the two 

 intermediatc stripes are straight and even and reach about four- 

 fifths the way down, where thsy mcet and spread to ths base and 

 laterally te the latéral stripes Pubes?ence rather abundant, but 

 very short except on the sid'es where it is longish, yellow and tuft- 

 ed. Scutellum large, orange-yellow, transparent, with a médium 

 pale yellow oubescence. 



Abdomen about as long as the thorax (or cv:'n longer) tapering 

 gradually towards the apex, dull black v,ith bright orange side- 

 markings ; the first segment is dull black with a very straight grey 

 hind margin ; the second segment bas the sides ali orange which 

 colour extends on the dise in a large blunt triangle leaving about 

 the middlc sixth of the dise black, and Connecting the black ba.se 

 with a black band which runs right across the dise (but not to the 

 side margins) ;■ • before the narrow orange hind margin ; this 

 black band is widest at its middle and gradually narrows to a point 

 ncar the side margins, the black markings on this segment thus 



