in this group, and he made a new genus for their reception, which he 
named Alorellia ; he failed, however, to characterize the different 
species satisfactory, and it was our own countryman Haliday who, 
retaining It. Desvoidy’s generic name A forellia, first clearly separated 
the two common species which had been previously confounded. II is 
account will be found in the Entomological Magazine for 1836. Mac- 
quart had previously (in 1S33) described a well-marked smaller species 
in his “ Dipteres du nord de la France, ” which he named curvipes •* 
and he also noticed that there was another resembling Al. hortorum , 
but he only noticed slight differences in colour, and copied It. 
Desvoidy’s descriptions, which were too vague to be of any value. 
Dr. H. Loew fully described both the common species as well as 
another in 1857, and Professor Itondani also gave an account of them 
in 1862 ; but none of the authors I have mentioned agree as to the 
names which they give to the two common species, nor which of them 
should retain Fallen’s original name. Walker, in the “ Insecta Britan- 
nica,” ignored Haliday’s paper, only giving one species; and, as the 
descriptions of the latter author in the Entomological Magazine are 
very brief, and not now generally accessible, I hope it may not be 
without interest if I endeavour to describe the four species now in- 
cluded in E. Desvoidy’s genus, and try to clear up the synonymy. 
The larvae of the two common species have been found in cowdung. 
Genus MOEELLIA, E. Desv. 
Eyes naked, arista plumose, fourth longitudinal vein of wing bent 
outwards towards the third, in a rounded curve, so as nearly to close 
the first posterior cell, which terminates a little before the apex of the 
wing ; posterior or discal transverse vein placed midway between the 
anterior or little cross vein and the centre of the curve of the fourth 
longitudinal vein. Shining blue-black flies, striped and tessellated with 
black and white, with the antennae, palpi, and legs black. The species 
in this genus are coloured and marked in a very similar manner to 
Aricia albo-lineata (one of the Anthomyiidce ) , with which they must 
not be confused. 
The species may be thus distinguished : 
A. Hind metatarsi with a cushion of short stiff hairs on their under surfaces, but 
not bearded, and hind tibia) straight, or only slightly curved. 
B. Middle tibiae without a basal tubercle in the males. 
C. Hind tibiae straight, fore tibiae simple. 
Sp. 1 — simplex, Loew. 
* This species has not been recorded as British, though it is not uncommon in England. 
