84 the entomologist. 



Males. 



a. Short winged ; in fore wing three sectors, as a rule, 

 going from cubitus to hind margin ; neuration rather 

 close, and markings in British examples, at least, 

 usually small and faint. Antennae rather thick, joints 

 moniliform. Ventral plate not produced at the apex, 

 the margin of which is excised . . . initata, Newman. 

 aa. Full winged ; in fore Aving two sectors, as a rule, going 

 from cubitus to hind margin ; neuration wider ; 

 ' fasciate markings usually distinct. Antennae slender, 

 joints not moniliform. Ventral plate produced, up- 

 turned, margins entire .... risi, Morton. 

 (For side view of ventral plates, see figs.. Trans. Ent. 

 Soc. Lond. 1896, pi. ii.) 



Females. 



a. Wings with three more or less distinct fasciae, and in 

 addition the apex of the wing is occupied by a well- 

 defined marking which may be connected posteriorly 

 with the immediately preceding fascia, but which is 

 frequently separated therefrom anteriorly by the space 

 between the radial sector and the radius ; three or four 

 sectors going from cubitus to hind margin imtata, Newman. 

 aa. Wings with three more or less distinct fasciae, but the 

 apex of the wing without any well-defined marking, 

 although the whole apex beyond the outmost fascia 

 may become somewhat darkened in very mature ex- 

 amples. Neuration less close ; two or three sectors 

 going from cubitus to hind margin . . . risi, Morton. 



In the meantime, I cannot attempt to give anything like an 

 outline of the geographical distribution of these insects. Practi- 

 cally the whole material dealt with has been drawn from Scot- 

 land, chiefly from Eannoch and Clydesdale. All three abound 

 in Perthshire at the proper time, and I took all of them in 

 Lanarkshire on April 9th and 10th, 1910. I have little hesita- 

 tion in saying that they occur pretty generally throughout Scot- 

 land. No doubt they occur in many English localities. 



For T. risi, Mr. Porritt gives the following localities : Harden 

 Clough, near Huddersfield, and Dunford Bridge, both in South- 

 western Yorkshire (Porritt) ; and Buckden in Wharfedale, North- 

 western Yorkshire (Carter). Other localities are Haslemere, 

 Surrey (July), Eiver Yealm, at Cornwood (May 16th), both in 

 McLachlan's collection ; and Mr. Briggs records it as rare at 

 Exeter, Bickleigh Vale (Bignell), and not uncommon on East 

 Lyn Piiver (April, Briggs). 



T. nehulosa, according to Briggs, has been taken near Exeter 

 (Parfitt), and at Exminster (March, Bignell); and Porritt has 

 it from Pickering, East Yorkshire (February 1st). 



The only species known from Ireland with certainty is T. risi, 



