Asilidae. 15 



tion of the antennæ is very small and the ocellar triangle is placed 

 farther back than usual. Jowls small, slighlly descending below the 

 eyes. No ocellar bristles. Antennæ four-jointed, the first joint longer 

 than the second, the third the longest, the last is short and forms a 

 blunt style; this last joint has a curious shape (Fig. 7), it is incised 



Fig. 7. Antenna of D. atricapilla. X 30. 



on the upper side about the middle or nearer to the base, and at 

 the base of the incision a spine is inserted ^ Eyes with the facets 

 in front from the inner eye-margin outwards distinctly enlarged. On 

 the posterior side of the head below the occipital foramen there is a 

 membraneous part in which the stipites of the maxillæ lie ; the clypeus 

 forms a triangular part below in the middle of the epistoma. Pro- 

 boscis is shorter than the head is high, directed horizontally forwards. 

 Labium has a characteristic shape, it is thick at the base, the lower 

 edge slightly arched in the apical third, the upper edge obliquely 

 cut so that the apex is tapering; the cut part is beset with erect 

 hairs; the basal part occupies about one third of the length of the 

 labium; — m D. Keinhardi the labium has a somewhat different shape, 

 it is not pointed but truncate at the apex, and directed somewhat 

 downwards. Genus Methylla Hans. (Nat.Tidsskr. 3, XIV, 145). — Labrum 

 is triangular, short, of the length of the basal part of the labium ; the 

 maxillæ are longpointed, somewhat curved at the base, the maxillary 

 palpi are indistinctly two-jointed, the basal joint short, the apical 

 cylindrical. Hypopharynx is pointed, beset with erect hairs above over 

 more than the apical half; maxillæ and hypopharynx are of the same 

 length as labium. Thorax is rectangular, rather high, somewhat arched 

 above; there are two præsutural and some supraalar bristles-; scutel- 



The antennæ in Biodria aie generally described as having a two-jointed style, 

 thus in all five-jointed. Meigen, the founder of the genus, says about the 

 antennæ in Ulig. Mag. 1803 and in Klass. eur. Zweigfl. 1804 that they are five- 

 joinled, and the fourth joint he terms „becherformig" ; in Syst. Beschr. II, 1820 

 he says that the antennæ are three-jointed with a two-jointed style, the first 

 joint of which is short; his figures which are rather small (Klass. Tab. XIII, 

 Fig. 7— 9; Syst. Beschr. Il, Tab. 19, Fig. 17—18) show also a two-jointed style, 

 yet the fig. 17 on Tab. 19 in Syst. Beschr. only shows this very indistinctly. 

 Meigen has evidently only used a lens and then the antennæ may convey the 

 impression that they have the style two-jointed, but under the microscope the 

 above described structure and the faet that the style is undivided is clearly 

 shown. 



