492 Syrphidae. 



The species of Criorrliina are beautiful flies, more or less Bombus- 

 like, especially the species which have both thorax and abdomen 

 densely pilose; the other species may be almost Bee-liiie. The descending 

 epistoma, which is hoUowed below the antennæ but almost straight 

 from the central knob downwards, gives them a characteristic profile. 

 They occur in wooded districts, especially in spring, and often on 

 flovvers of Grataegus and on other shrub-flov^ers, 



Of the genus 8 species occur in the palæarctic region, 4 have 

 been found in Denmark. 



Tåhle of Species. 



1. Scutellum and more or less of the thoracai disc in front 



of it black-haired 1 . berberina, 



— Scutellum and the whole thorax yellow-haired 2. 



2. Antennal arista inserted at some distance from the base 

 of the third joint; abdomen somewhat narrow, with in- 



. conspicuous, yellowish grey pruinose bands ; anterior tibiæ 

 yellowish ^- asilica. 



— Antennal arista near the base of the third joint ; abdomen 

 roundish or oval, without distinct bands; tibiæ dark or 

 blackish 3. 



3. Abdomen densely yellow pilose 2. oxyacanthae. 



— Abdomen with short hairs which are dark or brownish 

 yellow, more or less black at the sides ; at each basal 



corner a tuft of long, pale hairs 3. floccosa. 



1. C. berberina Fabr. 



1805. Fabr. Syst. Antl. 240, 33 (Eristalis). — 1822. Meig. Syst. Beschr. 

 III, 237, 11, Tab. XXIX, Fig. 9 (Milesia) et 1838. VII, 116. — 1843. Zett. 

 Dipt. Scand. II, 674,3 et 1849. VIII, 3114, 3. — 1862. Schin. F. A. I, 350. 



— 1901. Verr. Brit. Fl. VIII, 580, 2. — 1907. Kat. palåarkt. Dipt. III, 123. 



Male. Vertex and frons yellowish pruinose, the latter black down 

 the middle; epistoma yellowish or greyish yellow pruinose, the lower 

 lateral parts broadly black and shining; vertex with long hairs, black 

 behind, yellow in front, sometimes almost all yellow; frons slightly 

 haired with yellow or black hairs; epistoma haired only on the sides 

 along the eyes and on the black lower part, the hairs long, pale above, 

 blackish below, or all blackish; the epistoma is hollowed below the 

 antennæ and then considerably produced to the central knob, but 

 below it almost not retreating so that the knob is low ; the lower part 

 of epistoma with the knob thus produced, and it is very descending. 

 Occiput yellow pruinose, the hairs brown or blackish below, yellow 

 above, but here also a row of black hairs, and in the darker speci- 

 mens the hairs all blackish. Antennæ reddish or brownish yellow, 



