( 1 ) 



appendages,' so largely developed in the same genus, may 

 represent the ' valves'; but the resemblance is most evanescent. 

 The penis seems formed on a plan wholly different." 



A propos of the question, whether Acentropus belongs to the 

 Lepidoptera or the Trichoptera, it is interesting to me to find 

 that, referring to Mr.M'Lachlan's paper "On the external sexual 

 apparatus of the males of the genus Acentropus" (Trans. Ent. 

 Soc.Lond.,1872, p. 157), Mr. Gosse says, "Looking at his figures, 

 I should have been inclined to say, if I had not been told, that 

 they represented the parts of some Papilio or Pieris." 



The memoir closes with these words — "Entomologists could 

 scarcely render me a kinder or more grateful service than by 

 sending me examples of male Papiliones, however torn in the 

 wings, or even the separated abdomens if duly authenticated, of 

 which they may possess worthless duplicates." I quote this in 

 the hope that some of my hearers may be able to render this 

 kind and grateful service to our distinguised colleague, and 

 thereby aid him in the completion of the task upon which he 

 has entered with such enthusiasm. 



But Mr. Gosse is not the only one of our members who has 

 monopolised a part of the Linnean Transactions; a whole 

 volume is to be devoted to the Rev. Mr. Eaton's " Revisional 

 Monograph of recent Ephemeridce or Mayflies," the first portion 

 of which, with twenty-four plates of details, appeared as the year 

 expired. Thirteen years have elapsed since Mr. Eaton's former 

 "Monograph on the Eirfiemeridce" was published (Trans. Ent. Soc. 

 Lond., 1871, p. 1), and though many points in the classification 

 which were formerly doubtful have now been elucidated, the 

 additional knowledge gained since 1871 has not necessitated any 

 material departure from the sequence of the genera, or disturbed 

 the scheme as a whole. The memoir when complete will eclipse 

 all that has been hitherto written on this group, and form a clear 

 resting-place in the history of the Mayflies, behind which few 

 will care or need to grope. 



Entomologists owe a fresh debt of gratitude to the Ray 

 Society for the publication of Mr. Buckton's " Monograph of the 

 British Aphides,'" with its 144 plates, all drawn and lithographed 

 by the author himself, the fourth and concluding volume of 

 which appeared in 1883. Dividing the Aphididcs into six tribes, 

 containing thirty genera, the author has described and figured 



