Asilidae. 43 



remain black; generally a slight pminosity is also seen on the front 

 margin of the fourth segment; as mentioned the pruinosity at the 

 lateral margins only occupies the hind corners, and on the fourth, 

 fifth and sixth segments the hind corners are also occupied by a 

 transverse, pruinose spot. Venter black, somewhat shining. Abdomen 

 clothed with short hairs which are yellowish on the front part, but 

 black towards the apex; the hairs are long at the side margins of 

 the anterior segments, decreasing in length backwards. Venter with 

 somewhat long, pale hairs. The genitalia have short, black hairs, 

 slightly longer below; there are some reddish hairs just at the apex. 

 Legs quite black ; coxæ greyish pruinose on the outer side and with 

 long, greyish hairs; the hairs on the dorsal side of the femora chiefly 

 black, on the ventral side yellowish grey; the hairs and bristles on 

 tibiæ and tarsi black; the dense pubescence apically on the ventral 

 side of the front and hind tibiæ brown. V^ings with rather strong, 

 blackish fumigation, most pronounced on the apical half; the veins 

 black. Halteres yellow. 



Female, This is somewhat dififerent from the male; the design 

 on the thoracic disc is very distinct, all the pruinose lines being 

 broader and grey and thus the two black, median lines and the two 

 divided side spots very pronounced ; the hairs on the disc are shorter 

 than in the male. The abdomen has no pruinose band in the middle 

 but the lateral margin of the first segment is grey and there is a 

 transverse, whitish grey spot at the lateral hind corners of the second 

 to sixth segments. Wings not blackish but slightly greyish. 



Length 7,5 — 10,6 mm. 



C. lateraiis is very rare in Denmark and even but recently detected ; 

 only four specimens have been taken, all in the little wood called 

 Tyvekrogen at the southern part of Grib Skov; one specimen was 

 taken in 1906 (Larsen) and three in 1907 (the author). I took my 

 specimens sitting on tree-stubs. It is an early occuring species, my 

 dates are ^^/5 — ^^/g. 



Geographical distribution: — Northern and middle Europe down 

 into France; towards the north to norlhernmost Scandinavia and here 

 common ; it occurs mainly in the mountainous districts. 



2. Laphriinæ. 



Somewhat robust species, generally more or less densely pilose. 

 Abdomen relatively broad and not decreasing in breadth towards the 

 apex. Antennæ three-jointed without style or arista (in the non- 

 Danish genus Laphjstia five-jointed, the third joint bearing a two- 



