8^ WALKER ON DIPTEEA OF AEU ISLANDS. 



covered with cinereous tomentum ; stripes, pectus, and underside of 

 the abdomen hoary ; tibiae red, with black tips ; wings brownish grey ; 

 radial areolet with a slate-coloured stripe. Male. Head slightly 

 gilded ; mystax with a few black bristles and many gilded bristles ; 

 beard testaceous- whitish ; sides of the abdomen and hind borders of 

 the segments lutescent. Female. Head and beard whitish ; mystax 

 with many black bristles and a few white bristles ; abdomen with an 

 apical style, more than one-third of the length of the preceding part, 

 sides and hind borders of the segments hoary. Length of the body 

 12-14 lines ; of the wings 14-18 lines, 



G-en. AsiLTJS, Idnn. 



39. Asilus longistylus, Wied. Auss. Zweifl. 1. 433. 13. 

 Inhabits also Java. 



G-en. OMMATirs, Illiger. 



40. Ommatius noctifer, n. s. Mas. Niger, capite aurato, thoracis 

 incisuris, scutello, pectore, segmentorum abdominalium marginibus 

 ventreque canis, tibiis fulvis apice nigris, alis cinereis costa apiceque 

 nigricantibus, halteribus ferrugineis. 



Male. Black. Head gilded; mystax with a few black and several 

 gilded bristles ; sutures of the thorax, scutellum, sides, pectus, hind 

 borders of the abdominal segments, and underside hoary ; tibiae tawny, 

 with black tips; wings cinereous, blackish along the costa and to- 

 wards the tips, veins black; halteres ferruginous. Length of the 

 body Qt-^^ lines ; of the wings 11-12 lines. 



41. Ommatius lucifer, n. s. Mas, JEneo-niger, capite argenteo, 

 pectore albido, abdominis segmentis ferrugineo marginatis, pedibus 

 testaceis, femoribus nigro-vittatis, tarsis nigris, alis limpidis apice 

 nigricantibus costa atra apud medium incrassata, halteribus testaceis. 



Male. Bronze-black. Head silvery in front ; mystax with a few black 

 and a few whitish bristles ; pectus whitish ; hind borders of the ab- 

 dominal segments ferruginous ; legs testaceous ; femora striped with 

 black ; tarsi black, ferruginous at the base ; wings limpid, blackish at 

 the tips ; costa deep black, incrassated in the middle ; halteres testa- 

 ceous. Length of the body 6 lines ; of the wings 11 lines. 



42. Ommatius retrahens, n. s. Fmm. Cinereo-niger, facie argen- 

 tea, pectore albido, pedibus testaceis, tarsis, femoribus tibiisque apice 

 femoribusque posticis nigris, alis limpidis apice subcinereis, halte- 

 ribus testaceis. 



Female. Cinereous-black. Head silvery white in front; mystax with 

 very few white and black bristles ; pectus whitish ; legs testaceous ; 

 tips of the anterior femora and of the middle tibiae black ; hind femora 

 and hind tarsi black ; anterior tarsi and hind tibiae black, testaceous 

 towards the base ; wings limpid, slightly cinereous towards the tips ; 



