534 Syrphidae. 



the peculiar, somewhat impressed lunules, and the pale, abbreviated 

 lines on thorax; again some points, as the sometimes distinctly looped 

 cubital vein and also the habits of the larva might seem to approx- 

 imate it to Merodon. The question is at present not to be settled, I 

 shoLild, however, be inclined to think that it is most nearly allied to 

 Xylota, also on account of the construction of the mouth parts. 



The species of Eumerus are interesting and characteristic flies; 

 they occur in and at the outskirts of woods on various flowers, rnany 

 species especially on dry and sandy localities. Verrall says that the 

 species seem to |him to have some connection with small aculeate 

 Hymenoptera. 



The genus is mainly of southern occurrence; about 41 species 

 occur in the palæarctic region; 4 have been found in Denmark. 



Tahle of Species. 



1. Abdomen more or less reddish 1. sahulonum. 



— Abdomen not reddish 2. 



2. Eyes distinctly hairy, in the male touching for a long space ; 

 wing-stigma blackish 3. ornatus. 



— Eyes less hairy, in the male touching for a short space; 

 wing-stigma pale brown 3. 



3. Antennæ black; abdomen with pale, somewhat long hairs 

 at apex; fourth abdominal segment in the male without 



pale hind margin 2. strigatus. 



— Antennæ red; abdomen with the hairs at apex black and 

 short; fourth abdominal segment in the male with a pale 



hind margin 4. ruficornis. 



1. E. sabulonum Fall. 



1817. Fall. Dipt. Suec. Syrph. 61, 7 (Pipiza). — 1843. Zett. Dipt. Scand. 

 II, 863, 2 et 1855. XII, 4673, 2. — 1848. Loew, Stett. ent. Zeitg. IX, 144, 4 

 et 1855. Verhandl. zool. bot. Gesell. Wien, V, 693. — 1862. Schin. F. A. 1. 

 288. — 1901. Verr. Brit. Fl. VIII, 616, 1, figs. 418—420. — 1907. Kat. 

 palåarkt. Dipt. III, 136. — E. ruhriventris Macq. 1827. Soc. Se. Lille, 267,2 

 et 1834. Suit. a Buff. 1, 528, 10. — 1838. Meig. Syst. Beschr. VII, 112, 18. 



— E. Selene Meig. 1822. 1. c. III, 210, 12. — ? Syrphus tricolor Fabr. 1798. 

 Ent. Syst. Suppl. 563,85—86 et 1805. Syst. Antl. 244, 52 (Eristalis). — 

 ?E. strigatus Meig. (nec Fall.) 1822. 1. c. III, 207, 7. 



Male. Vertex large, æneous black, eyes approximated or nearly 

 touching in a point, apparently bare; frons and epistoma black, shining; 

 vertex with yellow hairs, frons and epistoma with longish, whitish 

 hairs. Occiput æneous, much putfed out above; it is grey pruinose 

 along the eye-margin below to above the middle, the pruinose margin 

 often ending above in a reddish streak; the hairs short, white, almost 



