THE SMALL SCALLOP. I33 



to fosteiing warmth will grow very quickly and produce moths 

 the same year. 



This species has been referred to the genus Sterrha^ Hiibner, 

 but authorities are not agreed as to the validity of this. 



Acidalia perochraria. 



The species last referred to as ^. ochrata was formerly known 

 in Britain as pallidarla^ and was figured by Curtis in 183 1 under 

 that name. Afterwards the name was changed to perochraria^ 

 and later still the correct name was found for it. 



How far there may have been confusion of the two species in 

 the records of the present one, I have no means of ascertaining, 

 but probably all but two should properly refer to ochrata. The 

 only two known British specimens of perochraria therefore 

 appear to have been captured in the Redhill district of Surrey, 

 one in 1865 and one in 1869. As will be seen on reference to 

 Plate 50, where a portrait of a Continental specimen will be 

 found (Fig. 6), the general colour is much brighter than that 

 of ochrata. It will be noted, also, that there are four darker 

 cross lines on the fore wings, and three on the hind wings. The 

 antennae, too, of the male are toothed, and therefore differ from 

 these organs in ochrata. 



The Small Scallop {Afiia emarginata). 



As will be noted on turning to Plate 50, Figs. 7, 8, the 

 male of this pale ochreous brown species is generally rather 

 larger than the female, and the more ample wings are less 

 acutely angled in outline ; the latter sex is also more clouded 

 with reddish brown. 



The caterpillar is variable in colour ; one form is of a dusky 

 ochreous colour with a pale line along the middle of the back, 

 edged on each side with a darker tint, and most conspicuously 



