544 Syrphidae. 



surface of the segment, between the filaments, is a short, brown 

 posterior spiracular process; it is constricted in the middle, somewhat 

 elliptical in transverse section and with a longitudinal dividing line 

 above and below; it bears the spiracles on the truncated end, The 

 colour of the larva is dirty yellowish; the length of the full-grown 

 larva is 16 mm. The pupa is brownish, flattened below, much arched 

 above; the front part is attenuated and the dorsal side here declining 

 downwards to the anterior point; about at the hinder border of the 

 declining part are two short, blackish spiracular tubes, pointing up- 

 wards and diverging; they are beset with small tubercles; the pupa 

 is a little attenuated towards the posterior end and has here the six 

 filaments and the posterior spiracular process as in the larva, but the 

 filaments are shorter. The pupa is much shorter than the larva, the 

 length is 7,5—9 mm, — According to the above the larva evidently 

 hibernates. 



Also of this genus the affinities are obscure ; it is placed here on 

 account of the medial cross-vein being not situated before the middle 

 of the discai cell, but the bristles on thorax and the distinct eye- 

 margins, as well as the simple legs would otherwise place it near 

 ChUosia; I am inclined to think that it is in reality nearly related to 

 this genus, also on account of the construction of its mouth parts, 

 which are rather conform with those of ChUosia; the species were 

 originally placed in that genus until Rondani in 1844 created the genus 

 Ferdinandea for them, but placing this genus next to ChUosia. 



The species of Ferdinandea are rather beautiful flies with their 

 striped thorax and brightly æneous or brassy abdomen; they occur in 

 wooded districts and frequent various flowers but are often seen at 

 ulcerated tree-stems with exsuding sap. 



Of the genus 3 species are known from the palæarctic region; 

 2 occur in Denmark. 



Tahle of Species. 



1. Arista blackish; the duU bands on abdomen just on the hind 



margins of the segments 1 . cuprea. 



— Arista reddish ; the duU bands on abdomen before the hind 



margins of the segments 2, ruficornis. 



1, F. cuprea Scop, 



1763, Scop. Entom, Garn. 355, 962 (Conops). — 1857, Loew, Verh. 

 zool. hot. Geseli. Wien, VII, 619, 2 (Chrijsochlamys). — 1862. Schin. F. A. I, 

 363 (Chrijsochlamys). — 1901. Verr. Brit. FL VIII, 624, 1, figs. 425—426 

 {Chrysochlamys). — 1907. Kat. paiåarkt. Dipt. III, 138. — Chrysochlamys 

 nigrifrons Egg. 1860. Verh. zool. hot. Gesell. Wien, X, 664. — 1862. Schin. 



