44 



Orthonhapha l)racliycera. 



or black with yellow apex. Abdomen black, second, third and fourtli 

 segments witli a transverse yellow spot on each side of tlie iiind 

 margins, tliat on the lirst segment subtriangular, the otiiers being 

 broadest inwards, liftli segment with a triangiilar, apical spot, pro- 

 duced in front towards the anterior margin. Venter black with broad 

 yoliow iiind margins ol" the segments, tiiat on tlie second segment 



Fig. 16. Wing of S. fitrcata. 



sometimes extended lo tlie front margin. Abdomen above clotlied 



with long, yellow pubescence, on the venter with long, paler yellow 



to greyisli i)ubescence. Legs black: tibiæ with yellow bases; larsi 



y, yellow, darkened towards the ends; the legs clothed 



'2i, with pale pubescence, whicli is ratber long on the 



femora. Wings yeilowisli witii yellow veins. Halteres 



yellow. 



Female. Eyes practically bare, coloured as in tiie 

 male, but the band situated a little above the niiddle, 

 and the dark bluish lower part larger. Front and face 

 black, with two yellow spots above the antennæ, and 

 another pair of yellow spots at the vertex. on the back 

 iif the head; iiinder eye-niargin black. Pubescence 

 OU the thorax somewhat shorter than in the male. 

 and sometimes being quite whitish grey, and in 

 this case the pubescence on abdomen may also be 

 grey. Scutellum generally more yellow than in the 

 male. 



Length. This species may vary considerably in 

 '■ size, the length being 13 — 18 mm. 



furcata, aliout nat. Tho larva is lighter or darker brownisli, generally 

 size. The spine likc ^yit], some darker. longitudinal stripes; it laiiers much 

 piotulærancesatlhe ti i , 41 j 



anterior corner.s of towards tlie apex, the last segment is long and 



second and tliird slender. twice as long as the penultimate; the second 

 abdoniinal sei,'inents , ,■ . i , , • , , , ...... 



are to be seen, bul ^"'' 'hird abdonimal .segments have an mdistinct. 



soinewhatindistinct. spine-shaped lateral iimtuberance at the anterior 



corners. VVIien full grown the larva has a length of about tU) mm. 



The pnpa has a curious form: when tlie skin gets rigid and forms 



