Chilosia. 137 



end but are very small, often not seen. The posterior end is roundly 

 pointed, sometimes {albitarsis and vernalw) cut and flat; it bears the 

 same short, longitudinally somewliat divided, reddish spiracular pro- 

 cess as in the larva. 



As seen from the above recorded the larvæ are phytophagous, 

 living internally in piants, in stalks, roots or leaves, or in fungi ; they 

 are thus as to feeding habits quite different from the aphidiphagous 

 larvæ of the allied genera, a faet also proving the validity of the 

 genus. With regard to hibernation there seems to be some variation; 

 some species are recorded to hibernate as pupa (perhaps especially 

 the early spring species), while others were bred in the same year in 

 which the larvæ were found feeding. 



The species of Chilosia occur on various piants and flowers in 

 woods, fens, on fields and meadows; some are exclusively spring 

 species, occurring on spring flovvers and seeking early flowering trees 

 as Salix, while others occur later in the year or during the whole 

 season. 



Of the genus about 140 species are known from the palæarctic 

 region; 30 have been found in Denmark. 



Table of Species. 



Males. 



1 . Eyes bare 2. 



— Eyes hairy 10. 



2. Abdomen with grey spots 1 . maculata. 



— Abdomen unspotted o. 



3. Legs black 4. 



— Legs more or less pale 7. 



4. Thorax coarsely punctate, with a double pubescence 5. 



— Thorax finely punctate, pubescence simple, not double. ..... 6. 



5. Pubescence on thorax somewhat long and the long hairs 

 somewhat dense; wings strongly brownish 3. nigripes. 



— Pubescence on thorax short and the longer hairs less dense; 



wings nearly colourless 4. vicina. 



6. Epistoma almost not pruinose; pubescence on thorax black ; 

 abdomen with black hairs at the basal corners of second 



segment; balteres with the knob generally a little darkened 2. antiqua. 



— Epistoma pruinose; pubescence on thorax short, yellow; 



abdomen without black hairs ; balteres orange 5. pubera. 



7. Arista distinctly pubescent 8. 



— Arista almost bare 9. pagana. 



8. Central knob on epistoma not specially broad; thorax black- 



haired; tibiæ blackish except base and apex 8. longula. 



— Central knob on epistoma very broad; thorax yellow- 

 haired or mainly yellow-haired; tibiæ orange with black 



rings 9, 



