( 73 ) 



striking between the females. Dr. Perkins had suggested 

 that a resemblance brought about in this remarkable manner, 

 by means entirely different from those employed in the model, 

 was certainly inexplicable on the hypothesis of climatic 

 influence. 



This mimetic resemblance had been fully described by 



[ci 

 Cockerell (Trans. Amer. Ent. Soc, xxxvi, p. 201, 1910) who 

 stated that certain species of the Australian Paracolletes also 

 resembled the same Prosopis models. " The yellow dorsal patch 

 in the Prosopis is tegumentary, in the Paracolletes due to hair, 

 but the superficial effect is the same. To my astonishment I 

 find also an Halictus with the same coloration (the patch due 

 to hair), so similar to Paracolletes Jlavomaculatus that I had 

 no doubt of its being a close relative until I came to examine 

 it in detail." This species was described (I.e., pp. 201, 202) by 

 Cockerell from three 9 specimens, from Macleay, Queensland 

 as Halictus paracolleli?ms, and it was probable that the 

 specimen exhibited was the <$ of the same species. 



A short discussion on the mimetic signification of this 

 exhibit took place, in which the President, Prof. Poulton, 

 Messrs. C. 0. Waterhouse and G. A. K. Marshall took part. 



Cocoons of Norasuma kolga, H. Druce, spun under 

 natural conditions. — Dr. W. A. Lamborn observed that 

 some cocoons formed by larvae of this species in captivity had 

 been previously exhibited by Professor Poulton, which, how- 

 ever, did not present quite the same appearance as those 

 formed under natural conditions. The specimens now ex- 

 hibited were formed by wild larvae under leaves and were 

 found in the clearing at Oni Camp. They gave a better idea 

 as to the mimicry of Braconid cocoons by the formation of 

 little bosses of yellow silk. He remarked that it is the rule 

 to find several cocoons under one leaf — frequently as many as 

 twelve. 



Papers. [ciii 



The following papers were read : — 



" Notes sur quelques especes des Lucanides dans les collec- 

 tions du British Museum et de l'Universite de Oxford," par 

 M. Henri Boileau, F.E.S. 



