108 MB, WALKEE ON DIPTEBA COLLECTED AT MAKESSAE. 



towards the base ; nearly half the apical part stylate. Length of the 

 body 10-12 hnes ; of the wings 18-20 lines. 



51. AsiLus iNTRODUCENS, n. s. F(Bm. Cinereo-niger, capita aurato, 

 antennis nigris, thorace vittis duabus lateribusque cinereis, abdo- 

 mine fasciculis quatnor basalibus cinereis dimidio apicali stylato, 

 pedibus nigris robustis rufo variis, alis fuscescentibus, halteribus fulvis. 

 Mas'? Capite argenteo, abdomine fascia basali fasciculari fasciaque 

 subapicali albidis latis, alis obscure cinereis. 



Female. Cinereous black; head gilded in front; with cinereous hairs 

 beneath ; epistoma slightly prominent ; mystax with several gilded 

 bristles, and above with a few black bristles : antennae black ; 3rd 

 joint lanceolate, nearly as long as the arista : thorax with two cinereous 

 stripes, which are dilated on each humerus ; sides and pectus cinereous : 

 abdomen with two cinereous tufts on each side at the base ; nearly 

 half the apical part stylate : legs black, stout ; femora red beneath 

 and partly above ; tibiae with a broad red band : wings brownish, 

 somewhat paler towards the base and about the borders of the posterior 

 areolets ; veins black ; halteres tawny. 



Male ? Head silvery in front ; mystax with several white, and above with 

 a few black bristles ; abdomen with a broad whitish tufted band at 

 the base, and with a broad whitish subapical band ; wings dark cine- 

 reous, partly paler, as in the female. Length of the body 8-12 lines ; 

 of the wings 12-16 lines. 



52. AsiLUS AREOLARIS, n. s. Mas. Cinereo-niger, capite aurato, an- 

 tennis nigris basi fulvis, thorace vittis tribus cinereis, abdomine apice 

 nigro nitente segmentis cinereo marginatis, pedibus fulvis, tarsis pos- 

 terioribus nigris, alis fuscescenti-cinereis pallido lituratis triente basali 

 albido, halteribus testaceis. Fcem ? Antennarum articulo 3^ fusiformi, 

 alis fuscescentibus hyalino lituratis. 



Male. Cinereous black ; head gilded in front, clothed with black hairs 

 beneath ; epistoma prominent; mystax with many gilded bristles, and 

 above with a few black bristles ; antennae black, tawny towards the 

 base ; thorax with three slender cinereous stripes, sides and pectus 

 cinereous ; abdomen black and shining at the tip, hind borders of the 

 segments cinereous ; legs tawny ; posterior tarsi black ; wings brown- 

 ish cinereous, with paler marks in most of the areolets, white on more 

 than one-third of the length from the base ; veins black, tawny towards 

 base ; halteres testaceous. 



Female"? Epistoma less prominent ; third joint of the antennae fusiform, 

 hai-dly half the length of the arista ; wings brownish ; marginal areo- 

 lets with a nearly colourless spot in each. Length of the body 10 

 lines ; of the wings 18 lines. 



53. AsiLUS TENUicoRNis, u. s. FosM. Cinereus, capite argenteo, 

 antennis testaceis parvis, thorace vittis duabus fuscescentibus, abdo- 

 mine obscure cinereo segmentis testaceo marginatis, pedibus fulvis, 



