NOTES AND OBSERVATIONS. 403 



" illustrated catalogue," which was somewhat slightingly spoken 

 of when the work was first announced a few years ago. Brief 

 descriptions of the earlier stages are included wherever these are 

 known, and the dry descriptive matter is often enlivened by notes 

 on the habits of the imago. Scientifically, too, the names of 

 such contributors as Jordan, Aurivillius, and others are guarantee 

 that we have work of real classificatory value, and their synopses 

 and dijBferentiations should be a real help to advanced students. 



The completed volume (vol. i.) will appear to many to be less 

 important than most of those which follow, as we have already 

 so many good text-books and iconographies of the Palaearctic 

 Rhopalocera. On the other hand, the large number of the 

 students of the group justifies an extensive literature, and the 

 present volume by no means duplicates its predecessors, but 

 gives a wider view of the Palaearctic area and much new or newly 

 collected information. 



The illustrations are for the most part good, and of practical 

 use for the determination of species. We wish the enterprise 

 continued success. 



. NOTES AND OBSERVATIONS. 



Second International Congress op Entomology.— The Second 

 International Congress of Entomology will be held at Oxford from 

 August 5th to 10th, 1912. Further particulars will be announced 

 shortly. 



Tbe President of the Congress is Professor E. B. Poulton, D.Sc, 

 F.R.S. 



The Executive Committee proposes to find for Members of the 

 Congress lodgings in the town, or rooms in one or more of the 

 Colleges, at a moderate charge ; rooms in the College will be available 

 only for men. The Executive Committee invites an early provisional 

 notice of intention to join the Congress, in order to be able to make 

 the arrangements for the necessary accommodation. Tbe proceed- 

 ings of the First Congress are in the press and will be published 

 shortly. All communications and enquiries should be addressed to 

 the General Secretary of the Executive Committee, Dr. Malcolm 

 Burr, c/o the Entomological Society of London, 11, Chandos Street, 

 Cavendish Square, London, W. 



Abnormal Union of Butterflies. — While collecting in Puszta 

 Peszer on June 12th this year, I captured a specimen of Argijnnis 

 daphne in copula with a Melittea athalia. The two specimens were 

 transferred from the net into a pill- box and remained united for some 

 considerable time. On exammation after they came apart both 

 specimens proved to be males. — N. Charles Rothschild ; Arundel 

 House, Kensington Palace Gardens, W. 



Note on the Roosting Habits of Heliconius charitonia. — 

 My attention was first drawn to observe the manner of clustering 

 together in groups of this species when asleep, by Borsa, wlio told mo 



