Helophilus. 45 1 



especially on third segment, and thus the black hind margins broader; 

 on third segment the spots somewhat lunulate, though varying in 

 shape, and generally not lying close to the front margin; the grey, 

 somewhat pruinose spots on fourth segment forming shallow lunules 

 and fifth segment with similar spots; the fifth segment with short, 

 blacii hairs on the apical part. Legs with anterior femora more yel- 

 low, about the apical half of the front and apical two thirds of the 

 middle femora, and also hind femora with a more distinct pale apex; 

 front tarsi with the basal joints quite dark and also the rest often 

 darkened, the end of tibiæ obscurely darkened. 



Length 13,5—15 mm. 



The type to this species, a female, is present in the collection of 

 Tonder Lund and Sehestedt, and I have examined it. 



H. trivittatus is not common in Denmark, though it may some- 

 times be numerous on some piaces; Frederiksberg, Valby, Amager, 

 Lersø, Dyrehaven, on Egholm at Skelskør; on Lolland at Strandby 

 and in Kældskov, and on Langeland at Lohals. My dates are ^^/s — ^^h. 

 It occurs at horders of ponds and ditches, on meadows and commons, 

 and it seems to prefer shore districts but is also seen in woods; I 

 have taken it on various Umbelliferæ; it may be seen flying quite 

 low over the water in ditches and setting down on piants quite at 

 the surface. I have only seen it numerous at a ditch in Valby but 

 Mr. L. Jørgensen has communicated to me that it is common on Lol- 

 land at Strandby. 



Geographical distribution:— All Europe and down into Persia; 

 towards the north to middle Sweden ; it has also been recorded from 

 Mexico. Verrall records it from North America, as he takes latifrons 

 Loew to be identical with it, but Becker 1. c. is, atter study of the 

 American species, of opinion that latifrons is a distinct species. 



2. H. hybridus Loew. 



1846. Loew, Stett. ent. Zeitg. VII, 141, 6. — 1862. Schin. F. A. I, 339. 

 — 1901. Verr. Brit. Fl. VIII, 529, 2, figs. 362— 363. — 1907. Kat. palåarkt. 

 Dipt. III, 108. — 1910. Beck. Berl. ent. Zeitschr. LV, 214, 225. — H. Henricii 

 Schnabl, 1881. Wiad. nank. przyr. Warschau, I, 1. — 1883. Mik, Wien. ent. 

 Zeitg. II, 46. 



This species is very much like trivittatus. Male. Head as in 

 trivittatus but the triangle above the antennæ more black, and the 

 middle stripe on epistoma black; the pruinosity and pubescence darker 

 yellow; occiput brownish yellow pruinose above and the hairs darker 

 yellow above. Thorax with the middle stripes more yellow and also 

 the side margin more yellow; the pubescence darker yellow, and 



29* 



