504 Syrphidae. 



Female. Similar to the male; vertex and frons somewhat broad, 

 widening downwards, black; the frons with large, grey side dust spots, 

 almost or quite meeting in the middle; the hairs black; the space 

 above the antennæ bare. Antennæ larger than in the male. Abdomen 

 with the whole thii-d segment, and generally the front margin of the 

 fourth black; the black segments more white-haired than in the male, 

 black-haired only in the middle. Tibiæ paler than in the male as 

 base and tip are more broadly pale, especially on the anterior tibiæ. 



Length 10—12,5 mm. 



C. fallax is somewhat rare in Denmark ; Geel Skov, Tisvilde, Sorø, 

 and in Jutland at Serup on Thyholm. My dates are 2^/5—^/7. It 

 occurs in woods and my specimens are generally taken sitting on 

 tree-stubs; it is also recorded to frequent flowers of Prunus, Rubus 

 and Berberis. 



Geographical distribution : — Europe down into Italy ; towards the 

 north to middle Sweden, and in Finland. 



39. Bpacliypalpus Macq. 



This genus is allied to Criorrhina and Cynorrhina, and also to 

 the following genus, Xylota. The species are of somewhat large size 

 and somewhat elongated shape; the colour is blackish æneous, some- 

 times with yellow markings at the base of abdomen, and the species 

 are not specially densely pilose. Head somewhat short, about of the 

 breadth of thorax; it is considerably broader than high, narrowed 

 downwards and somewhat trapezoidal in circumference ; behind it is 

 a little arched below but a little excavated above. The eyes are bare, 

 in the male touching for a short distance. Frons moderately pro- 

 minent, with hairs only just at the eye-margins. Epistoma hollowed 

 below the antennæ, without central knob but with the upper mouth 

 edge produced about equally with the frontal prominence, the lower 

 part of epistoma thus somewhat produced but not much descending; 

 the epistoma is black and yellow, bare, with slight hairs only just at 

 the eye-margins. Mouth parts (as far as I have examined) of usual 

 construction, the proboscis somewhat short; palpi thread-like, not 

 short. 1 Thorax rectangular, a little narrowed forwards; scutellum 

 black, with a marginal fringe below. Abdomen elongated, not broader 



Macquart savs in his diagnosis "palpes courts", in Schiner this has developed 

 to "sehr kleinen Tastern" and Verrall says "palpi small"; this is, however, not 

 correct, at all events not for the species described here, which has the palpi 

 as long as in Criorrhina. 



