1905.1 169 



4>. X. lanccolatum Lw. : this species is now recoi'cled as British for 

 the first time, and I have very little doubt about its identifi- 

 cation, even though only one record has been made since its 

 description by Loevv in 1850 from Germany. The nrista is 

 half as long as the comparatively moderately long third 

 autennal joint ; the outer lamellae are much shorter than in 

 X. auctmn as well as being much broader at the base. 

 Col. Terbury took four males and one female at The Mound 

 in Sutherland between June 17th and 24th, 1904. 



5. X. Galiglnosum Meig. : apparently common as a Southern species 



as my numerous localities lie in Hampshire, Sussex, Kent, 

 and Surrey, though I have taken it in Essex and Cambridge- 

 shire even up to Wisbech which is in extreme North Cambs. 



6. X. appendiculatum Zett. : very common from Penzance to Arran 



and Logie near Forres. 



7. X. hrevicorne Curt. : apparently rare but widely distributed as 



my localities are Penzance, Bournemouth, Arran, and 

 Muchalls near Aberdeen. 



8. X. Jissum Lw. : apparently a Northern species as my localities 



after Dovedale and Millersdale are all in the Scotch High- 

 lands and extend even up to Tongue. 



23. SYSTENUS Lw. 



1 (4) Cubital and discal veins strongly approximating before the tip. 



2 (3) Tip of the wing with a conspicuous black spot 1. Scholtzii Jjw. 



3 (2) Tip of the wing uncoloured 2. adpropinquans Lw. 



4 (1) Cubital and discal veins almost parallel 3. bipartitus liw. 



There are five known European species of this genus, all of which 

 were described by Loew from Germany, and all of which may well 

 occur in Britain. I introduced one in the list of species at the 

 commencement of this paper, and I now introduce two more, while 

 I think I have seen one or both of the others, but the material is 

 at present unsatisfactoiy. It is evident that the species live on the 

 ulcerative sap from trees, and Mr. E. Jenkinson and Dr. D. Sharp 

 caught two of the species I introduce at the sap of an elm (Vlmus) at 

 Cambridge, from which they bred *S^. adpropinquans, while S. SchoUzii 

 was bred this year from a beech {Fagus) fungus. 



1. ^S. SchoUzii Lw. : Dr. D. Sharp has just sent me a beautiful male 



