Ferdinandea. 547 



trees on which there is exsuding sap. Zetterstedt remarks: "in Dania 

 certis annis freq., D. Stæger", and in Stæger's collection are also rather 

 many specimens so that he must on some occasion have met with it 

 in some numbers, while it is otherwise generally only seen singly. The 

 larva was taken in sap in a Populus alba, attacked by Cossus, in 

 Holte on ^Vs, and pupæ were found on the same place in the earth 

 at the foot of the tree next spring on ^^is, they developed on ^^4 and 

 further on (Kryger); the larva lived here together with the larva of 

 the following species, Mfhich also v\^as bred; the pupa was taken in an 

 ulcerated tree in Frederiksdal in April, developing on V5 (Schlick). 



Geographical distribution: — Europe down into Italy; towards the 

 north to northern Sweden, and in Finland. 



2. F. ruficornis Fabr. 



1775. Fabl-. Syst. Entom. 769, 35 {Syrphus) et 1805. Syst. Antl. 243, 50 

 (Eristalis). — 1857. Loew, Verh. zool. bot. Gesell. Wien, VII, 620, 1 (Chn/so- 

 chlmmjs). — 1862. Schin. F. A. I, 363 (Chrtjsochlamys). — 1901. Verr. Brit. 

 FL VIII, 626, 2 {Chrysochlamys). — 1907. Kat. pal'åarkt. Dipt. III, 139. 



Male. This species is very similar to cuprea; frons black or 

 brownish ; epistoma a little less descending, with the hairs below at 

 the sides all yellow. Third antennal joint less blackish on the apical 

 part; arista yellow or reddish, darker towards the apex. Thorax with 

 the grey hnes narrower and with fewer black hairs, especially in front 

 and behind. Scutellum with only few black hairs. Abdomen more 

 bluish; the duU black marginal bands lying before the hind margins 

 so that the hind margins themselves are shining; the hairs on the 

 duU bands partly or mostly black, especially on third segment. Legs 

 with the basal half or more of femora blackish brown, and with a 

 dark ring on anterior or front tibiæ; all the hairs and bristles pale, 

 and the bristles on the tibiæ small or almost wanting. 



Female. Similar, but the legs generally all yellow, except the 

 last tarsal joints. 



Length 8 — 10 mm. 



This species is, as seen, very similar to cuprea but distinguished 

 with certainty by the given characters, of which especially the red 

 arista and the duU abdominal bands placed before the hind margins 

 are conspicuous. 



F. ruficornis is very rare in Denmark, we have in all seven speci- 

 mens; the five are from earlier time, without particular locality, the 

 sixth is a bred specimen from Holte (Kryger) and the seventh is taken 

 in Jutland at Silkeborg (Esben Petersen). As remarked under the 

 foregoing species the larva was taken together with the larva of that 



35* 



