( xxvi ) 



This leads to a atill larger form, found chiefly in Scotland and 

 Ireland, which has a wing-expanse reaching to 15 mm., but in 

 which the tibial spur remains of a length equal to "8 of the 

 tibia, and the antennte have from 18 to 20 joints. This variety 

 might be called scotica or hiheriiica. I incline to the belief that 

 it is very much the same as Heylaert's iiorveyica, but if so, 

 Heylaert is in eri-or in identifying it with some Southern 

 French forms, with the result tliat his description, partly 

 perhaps founded on the French examples, reads as if it were 

 meant to apply to a dark form of reticidalella. Apai't from 

 structural characters, this form is not easy to distinguish from 

 crassiorella either by size, form, or colour. 



"There is a very small form which goes below 11 mm. in 

 expanse but has 18 antennal joints, and a til)ial spur of 

 practically the same length as in the preceding forms. This 

 is perhaps an aberration rather than a race, as no one appears 

 to possess a series of it. It might be called ab. minor. 



" Two sets of specimens remain, which come nearer than any 

 of these to specific distinctness. The first is repi-esented by 

 some insects in Mr. Clarke's collection which were derived 

 from the collection of IVIr. Mitfoi'd, and labelled by the latter 

 n. sp., on Avhat grounds I do not know. These look very like 

 ordinary nitidella, but have 19 joints to the antenna;, usually 

 only present in larger forms, and, what is more distinctive 

 and important, the length of the tibial spur approaches that of 

 crassiorella, viz. "73. The female with these specimens is of 

 the casta, not the crassiorella type. This form may be 

 provisionally called var. mitfordella. 



" The second is a seiies of specimens bred by Mr. Bower 

 from a Kentish source. These are fractionally smaller than 

 nitidella, and have a similar tibial spur ; the antennie have 

 only 16 to 17 joints, and, what is perhaps a more fundamental 

 difference, the pectinations are much shorter than in any other 

 form of casta, being about equal to, or rather less than, 2 

 antennal joints in length, whereas 2 j to 2^ denotes the length 

 in all the other forms which I have examined. I propose to 

 name these provisionally var. boirerella. 



"I have also some Geiman specimens labelled intermediella 

 and affinis, which nowise differ in appearance from intermediella, 



