The two insects figured are considered by Mr. Stephens to 

 be the sexes : one specimen of the female he received from 

 Devonshire, and another was contained in the Cabinet of the 

 Author of Entomologia Britannica, which is now incorporated 

 with his unrivalled Collection of British Insects. For speci- 

 mens of the male, I am indebted to the liberality of Mr. Stone, 

 who received them last summer from Derbyshire. 



Meigen informs us, in the second volume of his Systema- 

 tische Beschreibung, &c. p. 105, that Atherix maculatus of 

 Lat., Rhagio Ibis and Anthrax Titanus of Fab., are merely 

 the sexes of the same species ; errors likely enough to occur 

 from the great disparity which exists between them. 



There are at present but two species of this Genus recorded 

 as natives of Rritain, although twelve are enumerated as Euro- 

 pean, — the rare and beautiful species figured, which has never 

 before been published in this country, and Bibio marginata F., 

 w^hich has been taken in Devon, and, Mr. Samouelle says, on 

 the borders of woods at Darent in June : a figure of it may 

 be seen in Donovan's British Insects, vol. xvi. p. 549, under 

 the name of Musca Atherix. 



The plant is Anthemis Cotula (Stinking Chamomile). 



