514 Syrphidae. 



Length 10—13 mm. 



The larva and pupa are described above under the description 

 of the genus. 



X. segnis is common in Denmarii all over the country. My dates 

 are ^"/5 — ^^h. It occurs in woods and fens, generally on somewhat 

 humid piaces where it is seen running on the leaves of low herbage, 

 especially on large leaves as those of Petasites. The larva was taken 

 in a decaying, humid stub of a beech in Dyrehaven on ^/s (Schlick), 

 and I have taken newly emerged specimens, still with the wings not 

 unfolded, on tree-stubs in Egebæks Vang in the latter part of July. 



Geographical distribution: — All Europe down into Italy, and on 

 Madeira; towards she north to middle Sweden, and in Finland. 



±. X. tarda Meig. 



1822. Meig. Syst. Beschr. III, 225, 19. — 1862. Schin. F. A. I, 357. — 

 1901. Verr. Brit. Fl. VIII, 600, 2, fig. 410. — Kat. palåarkt. Dipt. III, 131. 

 — X hifasciata Zett. (nec Meig.) 1843. Dipt. Scand. 11. 872, 4 et 1849. VIII, 

 3191,4. — X.confinis Zett. 1843. Dipt. Scand. II, 872, 5 et 1849. VIII, 

 3191, 5 et 1855. XII, 4674, 5. — 1862. Schin. F. A. 1, 354. 



Male. This species is rather similar to segnis. Frons with a bare 

 space above the antennæ. Thorax more short-haired and with the 

 long hairs behind less numerous and shorter; scutellum almost with 

 only short hairs except the hairs at the margin. Abdomen as in 

 segnis, second segment more broadly black at the base; the markings 

 often darker or more obscure and sometimes the hind margin of 

 second segment darkened. Legs coloured and haired as in segnis, the 

 hairs on femora much shorter, on hind femora quite short; hind femora 

 less thickened and hind tibiæ much less curved, and they are evcnly 

 curved, not abruptly in the apical third; hind trochanters with only 

 a short spur ; hind femora with only quite small but numerous spinules 

 below, not arranged in rows, only on the apical part a little larger 

 and in two rows. 



Female. Similar to the male and differing from the female of 

 segnis by the same characters as in the males; the reddish markings 

 on abdomen more vague. 



Length 9—10,5 mm. 



This species is easily distinguished from segnis by the characters 

 given above, especially the different armature below the hind femora, 

 and in the male by the short spur on the hind trochanter. Schiner's 

 character from the dark hind margin of the second abdominal seg- 

 ment is only sometimes present; Verrall's statement that the front 



