Asilidae. 27 



the lateral broadest in front ; a similar pruinose stripe on each side 

 at the margin; the pruinosity leaves in the middle two shining black 

 lines not reaching the scutellum, and on each side a shining black 

 space connected in front with the likewise shining humerus; the hume- 

 ral and postalar calli generally more or less rufous. Scutellum with 

 yellow hairs. especially at the margin, The præsutural and supraalar 

 bristles yellow. Pleura shining black, the hairy stripes fully developed 

 and very distinct, yellowish, downwards more whitish; the hairs at 

 the hind margin of the mesopleura and the long hairs on the meta- 

 pleura yellowish white. Abdomen shining black, from the third seg- 

 ment with yellow hind margins to the segments; at the lateral front 

 margins of the third, fourth and fifth segment there are yellow spots 

 which on the fourth and fifth and sometimes also on the third seg- 

 ment unite to a band which is confluent with the yellow hind margin 

 of the preceding segment; thus the abdomen gets yellow transverse 

 bands at the incisures, which bands are broad between the third and 

 fourth and the fourth and fifth segment. Venter similarly coloured, 

 Abdomen is sparingly clothed with short, yellow pubescence, which 

 is slightly longer on the venter; at the lateral margins of the anterior 

 segments there are long hairs. Genitalia partly yellow with moderately 

 long yellow hairs. Legs pale yellow; coxæ whitish pruinose on the 

 outer side and with long, whitish hairs which are nearly wanting on 

 the hind coxæ; the anterior tarsi with a brown spot on the lower 

 side of each joint, on the metatarsus the spot lying at the apex; the 

 hind femora with a blackish brown spot above in the middle, this 

 spot may be more or less extended, sometimes going all round the 

 femora; also the outermost tip of the femora is brown; the hind tibiæ 

 brownish except a more or less extended basal part, sometimes the 

 brown colour is restricted to the outer and inner side; the hind tarsi 

 with brown spots below and often brownish above except the base 

 of the metatarsus. The hind tibiæ very distinctly thickened at the 

 apex, but the hind metatarsi cannot be termed thickened. The legs 

 have a short, pale yellowish pubescence ; the fringes on the hind legs 

 are whitish; the usual long, thin hairs present; the stronger spine-like 

 bristles are in this species very long and thin, of yellow colour; they 

 are wanting on the anterior femora. Wings very slightly yellowish 

 with brownish veins. Balteres pale yellow. 



Female. Quite agreeing with the male, only the abdomen is 

 broader and the yellow bands generally narrower. 



Length 9 — 11 mm. 



This species which is the smallest (it is not shorter but much more 



