414 Syrphidae. 



genera have only value as groups of species; with regard to the 

 Danish species the following subgenera are represented: 



1. Arista plumose Eristalis s. str. (intricarius, arhus- 



torum, pertinax, nemorum, horti- 

 cola, vitripennis, rupium, alpinus). 



— Arista bare or only pubescent 2. 



2. Eyes unicolorous Eristaloimjia Rend. {cryptarum, 



lucorwn, tenax, anthophorinus, 

 oestraceus). 



— Eyes spotted 3. 



3. Eyes only hairy above, touching in the 



male Lathyrophthahnus Mik (aeneus). 



— Eyes quite hairy, in the male separated Eristalinus Rond. {sepulchralis). 



Girschner has (111. Wochenschr. f. Entom. II, 1897, 589) separated 

 the subgenera Eristalis and Eristalomya in another way according to 

 the presence or absence of one or two bands of denser hairs on the 

 eyes, but also this character indicates at most groups of species. 



Table of Species. 



1 . Arista bare or with short pubescence 2. 



— Arista plumose 8. 



2. Scutellum black or æneous ; eyes spotted 3. 



— Scutellum yellowish to brownish; eyes unspotted 4. 



3. Eyes hairy, separated in the male; black species with 



dull velvet spots on abdomen 1 . sepulchralis. 



— Eyes only slightly haired above, touching in the male ; 



æneous and shining species 2. aeneus. 



4. Antennæ orange and legs mainly orange 3. cryptarum. 



— Antennæ blackish or brownish and legs mainly black .... 5. 



5. Densely velvet piiose species; wings with a distinct 

 blotch, at all events in the female 6. 



— Normally haired species; wings without blotch 7. 



6. Scutellum yellowish; body yellow-haired; legs black 



with the basal part of tibiæ white 6. anthophorinus. 



— Scutellum bony white and white-haired ; body other- 

 wise extensively black-haired; legs blackish with the 



posterior tarsi yellow 7. oestraceus. 



7. Eyes simply haired; epistoma without black middle 



stripe 4. lucorum. 



— Eyes with two bands of dense hairs; epistoma with 



a black middle stripe 5. tenax. 



8. Densely velvet piiose species 8. intricarius. 



— Normally haired species 9. 



9. Hind tarsi black 10. 



— Hind tarsi pale on the basal joints 13. 



10. Epistoma without black middle stripe; anterior tibiæ 



somewhat long-ciliated 9, arhustorum. 



