470 Syrphidae. 



regularly arranged and a little larger spines, described above for the 

 EristaliS'lsLrra, are distinct and a little larger; otherwise the dermis 

 is likewise finely chagreened from small spinales; the anterior spiracles, 

 the antennæ-like papillæ, the ventral prolegs and the tail are all 

 similar. One of my speeimens shows very distinctly the thread-like 

 organs protruding from the anal opening. The length of the larva is 

 17 mm. The pupa is likewise similar to the Eristalis-pupa. ; it is pale, 

 dirty whitish, 12 mm long; in my speeimens the anterior larval spiracles 

 are only slightly visible on the pupa. The larva evidently lives in a 

 similar way as the Eristalis-larva. 



Of the genus only one, widely distributed species is known, also 

 occurring in Denmark. 



1. M. florea L. 



1758. Linn. Syst. Nat. X, 591 et 1767. XII, 2, 984, 29 et 1761. Fn. 

 Suec. 1796 (Musca). — 1764. O. F. Miill. Fn. Fridrichsd. 713 (Musca). — 

 1775. Fabr. Syst. Entom. 764, 8 {Syrphus) et 1805. Syst. Antl. ^2'i^,^ {Eristalis). 

 — 1817. Fall. Dipt. Suec. Syrph. 30, 25 {Syrphus). — 1822. Meig. Syst. Beschr. 

 III, 399, 21 (Eristalis). - 1843. Zett. Dipt. Scand. Il, 669, 15 et 1849. VIII. 

 3114, 15 et 1855. XII, 4652, 15 {Syrphus). — 1862. Schin. F. A. I, 338 

 {Helophilus). — 1901. Verr. Brit. FL VIII, 521, 1. — 1907. Kat. palåarkt. 

 Dipt. III, 112. — Helophilus nigrotarsatus Schin. F. A. I, 339. 



Male. Vertex black, frons dark greyish yellow pruinose, shining 

 above the antennæ; epistoma yellow pruinose with a black, shining 

 middle stripe, not reaching the antennæ, and with the lower side 

 parts black. Vertex and frons black-haired or the latter more or 

 less to quite yellow-haired ; epistoma with yellow hairs; the epistoma 

 somewhat hollowed below the antennæ, with a moderate central knob 

 and retreating below it; it is not protruding and slightly descending. 

 Occiput whitish grey pruinose, but it is very narrow or disappearing 

 above; the hairs whitish below, yellow above and here there are 

 some black hairs at the eye-margin. Eyes wMth somewhat short, pale 

 hairs. Antennæ black, third joint longer than broad; arista long, 

 bare. Thorax black, dull, with some more or less distinct, greyish 

 yellow or grey, sometimes almost whitish markings, caused by pruinosity ; 

 the markings are a transverse band at the front margin, divided in 

 the middle and here traces of two short, longitudinal stripes may be 

 seen ; then a transverse band following the transverse furrow, likewise 

 divided in the middle, and finally a band in front of scutellum ; some- 

 times the middle part between the two anterior bands is greyish so 

 that the whole front half becomes grey with a black spot at each 

 side ; thorax is clothed with yellow hairs, especially bright at the side 



