556 Syrphidae. 



apex of the front femora. Wings yellowish tinged; stigma yellow; 

 about the base of the cubital vein a slight darkening and from it to 

 the apex the wing a httie darkened on the anterior part and along 

 vena spuria and the discai vein. Squamulæ yellowish white, with the 

 margin and fringes dark yellow. Halteres yellow. 



Female. Vertex of medium breadth, the frons widening down- 

 wards; vertex black, frons yellow pruinose at the sides with a black 

 middle stripe; the hairs black above, yellow downwards, the space 

 above the antennæ bare, The fifth abdominal segment marked as the 

 fourth so that abdomen has eight yellow bands. 



Length 13,5 — 17 mm. 



T. vespiforme is rare in Denmark; Ordrup Mose (the author), 

 Dyrehaven- (Drewsen), at Røde Bro and in Bøllemosen (the author), 

 in Hareskov (Henriksen) and at Fiskebæk (the author). My dates 

 are ^Ve—^ls. It occurs on humid piaces in woods and frequents 

 especially Umbelliferæ ; I have also taken it flying at tree-stubs, pro- 

 bably the breeding piaces, and once I took in Bøllemosen several speci- 

 mens which came flying and sat down on dead tree-branches lying 

 on humid ground ; when they were sitting on the branches they were 

 not easily disturbed and could be taken with a glass-tube; they were 

 all males. One of the specimens from Drewsen has, according to the 

 label, been bred, but there are no further notes. 



Geographical distribution: — Northern and middle Europe down 

 into France; towards the north to northern Sweden, and in Finland. 



46. Arctopliila Schin. 



Large Bombus-like, densely pilose species, with the pile all pale 

 or dark and pale variegated. Head somewhat short, broader than 

 high, as broad as or a little narrower than thorax ; it is flat or a little 

 arched behind, but a little excavated upwards. Eyes touching in the 

 male for a short distance, well separated in the female; they are bare; 

 in the male the facets above very slightly enlarged. Vertex broad, 

 triangular; frons slightly prominent, with longish hairs. Antennæ in- 

 serted about in the middle of the head; they are small, third joint 

 roundish or almost square; the basal joints have small hairs, the 

 second bristles at the apex above and below, the third is microscopi- 

 cally hairy; the arista somewhat short, plumose with long hairs. 

 Epistoma very long; it is slightly hoUowed below the antennæ, with a 

 small and low central knob lying rather low, below the lower margin 

 of the eye; below the knob the epistoma is slightly retreating; it is 

 slightly protruding but strongly descending and pointed at the apex; 



