586 Syrphidae. 



what long, whitish or silvery to golden. Genitalia black. Legs as in 

 the other species but the tarsi generally brownish to blackish, and 

 generally also the apical half of tibiæ darkened. Wings more strongly 

 brown, all cross-veins more or less dark seamed. 



Fig. 200. Antenna of M. Eggeri d, from the inside. X 40. 



Female. Quite similar; vertex and frons, as in the male, broader 

 than in the other species, the horders not at all angular; the hairs 

 all yellow. 



Length 8 — 9 mm. 



I have determined this species as Eggeri because of the relative 

 length of second and third antennal joints, which prevents it from 

 being latifrons Loew ; I am inclined to think that M. latifrons apud 

 Verrall is likewise Eggeri. 



M. Eggeri is very rare in Denmark, and it seems to be rarer 

 than the two other species; at Sorø (Schlick); on Lolland at Maribo 

 (Schlick) and in Kældskov (L.Jørgensen); the dates are only ^/e — ^^/e. 



Geographical distribution : — Northern and middle Europe down 

 into France; at present it has its northern limit in Denmark. 



Remarks : The three species of Microdon now described are certain 

 and distinct; Verrall seems to doubt the distinctness of the European 

 species of Microdon., but concerning the three species recorded here I 

 feel quite certain with regard to their validity. 



VIL Ceriinae. 

 50. Cerioides Rond. 



{Ceria Fabr.) 



Somewhat large, narrow and elongate -species, very similar to a 

 Conops; they are of black colour with yellow spots on thorax and 

 pleura, and with narrow, yellow bands on abdomen, and they are 

 nearly bare. Head considerably broader than high and broader than 

 thorax, it is considerably excavated behind, but the margin is pufifed 



