356 Syrphidae. 



(This description is, as seen, quite in accordance with my descriptions 

 of the larvæ of the foregoing genera, which have liicewise a single, 

 transverse row of spinules on the meso- and nietathoracal and the 

 first abdominal segments; as Beling mentions no spinules on the fol- 

 lowing segments, the named anterior spinules are probably relatively 

 large, the others small). The posterior spiracular process brown, some- 

 what prominent. The mouth with distinct hooks, eaeh furcate and 

 bidentate. The colour is yellowish white, with blackish, translucent 

 intestine. Length to 10 mm. Pupa similar to the quite contracted 

 larva, but of light brown colour, 8 mm long. — I did not examine 

 my larva more closely, but it was mainly agreeing with Beling's 

 description; the pupa has no anterior spiracular tubes. 



Brauer has, in his work over the larvæ, on account of Beling's 

 observation suggested that the larva lives in anis' nests; I might think 

 that they are aphidiphagous as those of the related genus Sphaero- 

 phoria, and perhaps living in the same way; I may, however, note 

 that Mr. Kryger told me that there were plenty of ants on the place 

 where he took the larva of X. ornatum. The larva evidently hibernates, 

 as shown by Beling's observations and by my bred specimens. 



The species of Xanthogramma are beautiful and characteristic 

 flies by their bright markings strongly contrasted towards the black 

 colour; they occur especially on meadows on flowers and generally 

 flying rather low. 



Of the genus 4 species are known from the palæarctic region, 2 

 occurring in Denmark. 



Tahle of Species. 



I . Basal abdominal spots triangular, equilateral ; hind femora 



and tibiæ with more or less distinct, dark rings 1. ornatum. 



— Basal abdominal spots narrow and linear ; legs quite 



yellow 2. citrofasciatum. 



1. X. ornatum Meig. 



18i22. Meig. Syst. Beschr. III, 298, 37 (Syrphus) et 1838. VII, 130, 3 

 (Doros). — 1843. Zett. Dipt. Scand. Il, 693, 3 et 1849. VIII, 3127, 3 

 {Doros). — 1862. Schin. F. A. I, 319. — 1901. Verr. Brit. Fl. VIII, 448, 1, 

 tig. 318. — 1907. Kat. palåarkt. Dipt. III, 79. — Scaeva festiva Fall. p. p. 

 1817. Dipt. Suec. Syrph. 38. — Doros decoratus Zett. 1843. Dipt. Scand. 



II, 694,4 et 1849. VIII, 3127, obs. 2 et 1859. XII, 5088, obs. 



Male. Vertex black, frons and epistoma dull yellow ; jowls black ; 

 epistoma distinctly decreasing in breadth downwards. The hairs on 

 vertex, frons and epistoma yellow or more or less brown, or mixed 

 with black hairs, at the anterior apex of vertex a tuft of. black hairs. 



