304 PROCEEDINGS OF THE 



is attached to birch ; and T. vitellines, which feeds on willows and 

 birch. The species very closely resemble one another, and it is 

 only by breeding them that a proper knowledge of their distinctive 

 characters can be obtained. Mr Cameron then exhibited: 



Nomada mistura, Smith. — Four females of this bee have been 

 taken at Cadder wilderness and at Strathblane. Previously, the 

 male only had been recorded, and the capture of the female 

 renders it clear that it cannot be Nomada xanthostida, as was 

 suspected by some who had only met with the male. 



Pterocormus means, Gr. — A large series of this ichneumon was 

 shown, having the wings in various stages of development, a few 

 having the wings almost obliterated, while others had them 

 completely developed, and the latter agreed perfectly with the 

 description of Ichneumon crassi2)es, Lin. ; so it is evident that P. 

 means is merely a form of /. crassipes with abbreviated wings. 



Dineura selandriiformis, Cameron. — A new species, taken by the 

 Rev. T. A. Marshall, at St. Albans. (See Ent. Mo. Mag., xi., ^d2). 



Dineura fuscula, Klug. — This species has been recorded as 

 British by Stephens, but in error ; and it having been taken in 

 Cadder wilderness, it may now be added with certainty to our 

 lists. 



Nemahis striatus, Hart. — An account of the life-history of this 

 species was given. It is met with at Possil marsh, the larva 

 feeding on Salix fusca. In connection with it there was shown 

 the Nematus humeralis of Zetterstedt, which Mr Cameron had 

 received from Mr Fletcher of Worcester ; and it appears certain 

 that it can only be an almost black variety of striatus. 



And lastly, there was shown a variety of Tenthredo moniliata, 

 from Aberlady, with 4 of the abdominal segments red, instead of 

 3 as is usual ; and another specimen was exhibited, from Rannoch, 

 without any red on the abdomen. 



PAPERS READ. 



I. — On some new or little known British Ili/menojdera. 

 By Mr Peter Cameron, jun. 



On a more careful examination of the saw fly bred from galls 

 on the leaves of Salix herbacea, which I exhibited at the last 

 meeting of the Society, and having now both sexes before me, I 

 have been enabled to come to the conclusion that the species 

 cannot be referred with certainty to any of the described Nemati. 



