27(j Syrphidae. 



the genus falls into several groups, the species of which are evidently 

 more nearly related to each others than to the species of the other 

 groups. The hairy-eyed species from alhostriatus to lunulatus form 

 one group; macularis is doubtful and perhaps related to pundulatiis 

 and lasiophthalmus; the ribesii-gvoup includes the species from torous 

 to diaphanus, and I think that also annulipes and nitidicollis belong 

 here; of these species torvus and annulipes have hairy eyes, but this 

 character is evidently of no consequence as a group-character; the 

 species from nitens to arcuatus likewise form one group ; they have all 

 a characteristic flat, distinctly marginale abdomen with undulated 

 bands or lunulate spots; the margin of the wing exterior to the first 

 posterior and discai cells is also in these species a little broader, and 

 the wing membrane here a little more distinctly and regularly cor- 

 rugated than in other species; this is similar to what is found in 

 Lasiophthicus, to which genus these species are no doubt related, 

 as also suggested by Girschner (111. Wochenschr. f. Entom. 1897, 570) 

 (se also above under Lasiophthicus). The species hifasciatus and 

 balteatiis stand somewhat isolated ; cindellus, ci)ictus and auricollis 

 form one group, and the umbellatarum-group is formed of imibella- 

 tarum and compositarum and, I think, guttatus and perhaps triangu- 

 lifer; punctulatus and lasiophthalmus are nearly related; euchromus is 

 less easily placed, and barbifrons (together with some not Danish 

 species) would form one group. — It was seen above that the larvæ 

 also are divided into groups, and it is very interesting to see, that 

 these groups seem, as far as we know, to be the same as the groups 

 mentioned above for the imagines. Of the group of the hairy-eyed 

 species we know more or less well the larvæ of all our four species 

 {lunulutus doubtful), and they are similar, all being provided with 

 conical, pointed warts on the dorsum and at the sides. Of the ribesii- 

 group we know only the larvæ of ribesii and vitripennis, which are 

 fmely chagreened. Of the next group the larvæ (or pupæ) are known 

 of nitens, latifasciatus, corollae and luniger, all of which are similar, 

 clothed with dense, short, fine spines (as in the larva of Lasiophthicus, 

 and thus confirming that these species are related to pgrastri and 

 seleniticus). Further we know te pupæ of cinctus, cinctellus and auri- 

 collis^ which are smooth. A close study of a large material of larvæ 

 and pupæ certainly would give interesting results. 



