22 Orthorrhapha brachycera. 



branch of the postical vein recurrent, parallel with the margin, and 

 therefore the anal cell shorter than the second basal cell; the anal 

 vein reaching the margin. No stigma but the apical part of the 

 mediastinal cell more or less colom'ed, Axillary lobe large, the angle 

 almost rectangular. A small alula present, hairy at the margin. 

 Alar squamulæ small, with long, fan-like hairs at the margin. 



The developmental stages of this genus are not known, so far 

 as I am aware. 



The species of Bicellaria are characteristic, especially from the very 

 high and arched thorax. They occur especially in woods on open, 

 somewhat shaded piaces on bushes and in low herbage, but also on 

 fields and meadows. Poulton records m the work cited above B. 

 spuria from England with Scatopse brevicornis M. as prey, 



Of the genus 6 species are known from the palæarctic region 

 (after shnplicipes Zett. and sulcata Zett. are placed as synonyms to 

 melaena Hal. and spuria Fall. respectively) , but two of these are 

 doubtful; 5 species have hitherto been found in Demnark of which 

 two are here described as new, the total number of palæarctic species 

 thus increasing to 8, 



Tahle of Species. 



1 . First and second joint of the hind tarsi distinctly thickened ; 

 legs long and slender; abdomen in the male greyish 

 æneous, not black haired; balteres dark in the male, 



yellow in the female 4. nigra. 



— First and second joint of the hind tarsi sligbtly or not 

 thickened; abdomen black haired 2. 



2. Hind tibiæ not thickened towards the tip 1. melaena. 



— Hind tibiæ somewhat thickened towards the tip 3. 



3. Moderately pilose species, bristles on thorax considerably 

 shorter in front than behind ; abdomen in the male velvet 

 black 4. 



— Strongly pilose species, bristles on thorax almost as long 

 in front as behind; abdomen grey in the male; balteres 



dark in both sexes 5. pilosa. 



4. First and second joint on the hind tarsi not at all thick- 

 ened, legs rather short; balteres dark in both sexes ... 2. spuria. 



— First and second joint of the hind tarsi sligbtly thickened, 

 legs somewhat longer; balteres dark in the male, yellow 



in the female 3. intermedia. 



1. B. melaena Hal. 



1863. Haliday, Entom. Mag. I, 158. (Cijrtoma). — 1903. Kat. palåarkt. 

 Dipt. II, 221. — Cyrtoma simpUcipes : 1842. Zett. Dipt. Scand. I, 331, 4. 



— 1862. Schin, F. A. I, 76. — Bicellaria simpUcipes: 1903. Kat. palåarkt. 

 Dipt. II, 221. 



