474 LIST OF DIPTERA. 



shanks clothed with long pale yellow hairs ; shanks clothed with 

 long pale yellow hairs ; shanks bright yellow, with black tips ; 

 claws tawny at the base ; foot-cushions tawny : wings very light 

 brown ; each wing of the male with a brown spot below the fore 

 border just before the part where the wing is widened by the con- 

 vexity of the vein ; wing-ribs piceous ; veins black, dark ferruginous 

 towards the base ; poisers tawny. Female. — Like the male : chest 

 narrower : wings not spotted nor widened. Length of the body 

 8 — 11 lines; of the wings 13—18 lines. 



• ? From the Hardwicke bequest. 





b. New Holland. 

 e. ? 



Ommatius marginellus, Wied. Dipt. Exot. i. 213. Auss. Zweif. i. 

 421, 5. Macq. Hist. Nat. Dipt. i. 314, 3. Asilus marginellus, 

 Fair. Sp. Ins. ii. 464, 22. Ent. Syst.'w. 384,36. Dasypogon 

 marginellus, Fabr. Syst. Antl. 170, 28. 



a. South America. From Mr. Warwick's collection. 



b. ? 



Ommatius Saccas, n. s., fern. Fuscus, thoracis vittis tribus lateri- 

 busque fulvis, pectore albo> abdominis segmentorum marginibus 

 posticis cinereis, antennis fulvis apice nigris, pedibus fulvis, 

 femoribus et tibiis apice tarsisque nigris, alis sublimpidis apice 

 fuscis. 



Body dark brown : head a little broader than the chest, covered 

 with hoary down, clothed behind and beneath with white hairs ; 

 crown, front, and clypeus covered with tawny down ; tubercle 

 of the eyelets beset with a few black bristles ; clypeus armed with a 

 few white bristles, and on the hinder part with some longer but 

 more slender black bristles: eyes bronze; fore part flat, its facets 

 much larger than those of the other part : lip black, ferruginous to- 

 wards the tip, where it is clothed with short yellow hairs : palpi 

 black, clothed with a few long black hairs : feelers black ; first and 

 second joints tawny, of equal length; second joint beset with a few 

 black bristles; third joint conical, as long as the second; bristle 

 very much longer than all the preceding joints : chest thinly clothed 

 with very short black hairs, beset on each side and behind with 

 a few black bristles, adorned with three tawny stripes ; each side 

 stripe connected by two oblique tawny bands with the sides of the 

 chest, which pass from a tawny to a hoary hue towards the white 

 breast : abdomen much narrower than the chest, and rather more 

 than twice its length, very slightly tapering from the base to the 

 tip, clothed with hoary hairs ; hind borders of the segments gray ; 



