Ischyrosyrphus. 249 



iine; the hairs are yellow, but black in front of the ocelli, above the 

 antennæ and more or less on the middle line; jowls yellow. The 

 lines on thorax generally more distinct than in the male. Pleura 

 white-haired. The basal abdominal spots bluish, and often united, as 

 are also sometimes the other spots. Legs as in the male, the ring on 

 hind tibiæ often faint or almost wanting. 



Length 11—12 mm. 



/. glaucius is an uncommon species in Denmark; Ordrup Mose 

 (Stæger), Lyngby Mose, at Fønstrup Dam in Grib Skov (Kryger, the 

 author), Tisvilde (Klocker), and in Jutland in Hø Skov at Aarhus 

 (Victor Hansen). My dates are "'h—^-'ls. It occurs in fens and on 

 meadows especially on Umbelliferæ. 



Geographical distribution: — Northern and middle Europe down 

 into France; towards the north to middle Sweden, and in Finland. 



2. I. laternarius O. F. Mull. 



1776. O. F. Mull. Zool. Dan. Prodr. 2040 (Musca). — 1862. Schin. 

 F. A. I, 30 (Syrphus). — 1897. Mik, Wien. ent. Zeitg. XVI, 64 {Lageno- 

 syrphus). — 1901. Verr. Brit. FL VIII, 323, 2, fig. 268. — 1907. Kat. 

 palåarkt. Dipt. III, 54. — Syrphus glaucius Fabr. (nec Linn.) 1775. Syst. 

 Entom. 770, 37 et 1781. Spec. Ins. II, 431, 53 et i805. Syst. Antl. 243, 49 

 (Eristalis). — Syrphus glaucus Meig. 1822. Syst. Beschr. III, 315, 61. — 

 Scaeva miitala Zelt. Dipt. Scand. VIII, 3140, 28—29. 



Male. Frons greyish pruinose at the sides, blackish in the middle. 

 Epistoma yellow, greyish yellow pruinose, the central knob shining, 

 brown or blackish. Jowls grey. Vertex and frons black-haired ; epistoma 

 with black hairs at the sides, yellow towards the middle. Occiput 

 grey with yellow, downwards whitish hairs; above there is a row of 

 black, overhanging hairs at the eye-margin. Eyes densely hairy with 

 brown, downwards paler hairs. Antennæ black. Thorax brownish 

 black, dull, with two approximated greyish stripes in the middle, ab- 

 breviated behind ; sometimes the sides of the disc are also greyish, so 

 that four greyish stripes appear, separated by three black. Scutellum 

 black with the apex more or less translucently yellowish or brownish, 

 but sometimes all black. Thorax clothed with erect hairs, yellow in 

 front and behind, black on the middle; they are not dense, especially 

 not on the middle; scutellum has long, yellow hairs. Pleura with 

 yellow hairs. Abdomen rather narrow, velvet black, a little shining 

 at the apex; it has spots similar to those in glaucius, the large basal 

 pair likewise varying from bony white to greyish or bluish, and in 

 the latter case sometimes rather obscure; the second and third pairs 

 more grey than bluish, and more widely separated in the middle. 



