HEATH RIVULET. 209 



tinifasciata (the Single-barred Rivulet). The chief difference 

 appears to be that in the type {bifasciata) the " rivulets " are 

 white and distinct, thus bringing out a dark band between the 

 central one and the base of the wing. 



The stoutish caterpillar is pale brown, inclining to ochreous on 

 the back, along which are three Hnes, the central one greyish, 

 and the others whitish shaded with greyish ; a whitish stripe 

 low down along the sides ; the usual dots are black, and the 

 spiracles are black, margined with ochreous (adapted from 

 Fenn). In September and October it feeds in the seed capsules 

 of Bartsia odontites, and is often plentiful ; Mr. G. F. Mathew 

 records obtaining nearly five hundred from three small bundles 

 of the food plant gathered in the Harwich district. 



The moth is out in July and August, but is not often seen in 

 the daytime, and is not taken very frequently, even when flying 

 at night, but it comes to light, and visits flowers. 



From chrysalids obtained from caterpillars reared in 1900, 

 Mr. Robert Adkin bred ten moths in 1901, eleven in 1902, two 

 in 1903, five in 1904, and two in 1905. 



The species is widely distributed over England, Wales, and 

 the south of Scotland, but it is most frequent in the south of 

 England. Not much is known of it in Ireland, but it has been 

 noted from counties Dublin, Louth, and Derry. 



Heath Rivulet {Perizoma mmorata). 



The British form of this species (Plate 83, Figs. 9, 12) is rather 

 smaller and darker than typical minorata, Treitschke, and as 

 Stephens has figured and described it as ericetata, this name 

 should be adopted for our native race. 



The white fore wings have a greyish basal patch and three 

 bands of the same colour ; the outer one is traversed by a more 

 or less distinct wavy whitish line ; the band nearest the basal 

 patch is sometimes very faint ; more rarely the markings are 



Series II. p 



