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gracilis, Sahib., taken by him at Fleet, Hants, in August 

 1903. 



Injueies to Cetoniid Beetle. — Mr. G. J. Arrow ex- 

 hibited examples of a Cetoniid beetle, Dicronorrhina (subg. 

 Neptunides) manowensis, Moser,* to show injuries of a 

 remarkable character which he was quite at a loss to explain. 

 The first specimen was quite normal, the second had each 

 elytron perforated just behind the middle in an exactly sym- 

 metrical manner, the thii'd had the perforations in an 

 apparently incipient stage, the superficial chitin having dis- 

 appeared at the same spot, and in a fourth specimen there 

 was a discoloration on each side. In all the marks were per- 

 fectly symmetrical and occupied exactly the same position. 

 The specimens were sent from Chirinda, Rhodesia, by Mr. 

 Guy Marshall's collector. 



Polymorphic Papilio and Styx infernalis. — Dr. K. Jordan 

 exhibited the polymorphic Pajnlio lysithous and P. hectorides 

 from Brazil and the models which they imitate. The ex- 

 hibit illustrated a phenomenon observed in various groups of 

 butterflies : that a mimetic species is broken up into a number 

 of very different-looking individual varieties, which are all 

 specifically the same, while the imitated models are specifically 

 distinct from one another. He also exhibited both sexes of 

 the peculiar Peruvian butterfly Sti/x infernalis apparently 

 regarded by Staudinger as a Pierid. Dr. Schatz made a 

 mistake in describing the foretarsus of the ^ as being fully 

 developed. The distal segments of this tarsus are more or less 

 completely fused and the claws are absent. The insect is 

 decidedly an Erycinid in the structure of the antenna, 

 thorax, legs, neuration and the egg. 



Mimetic Locust.— Dr. Jordan also showed, on behalf of 

 the Hon. N. Charles Rothschild, an Acrotylus which Mr. 

 Rothschild had observed in some numbers in the desert on the 

 Upper Nile. The colour of these small locusts so closely 

 agrees with that of the sand and the pebbles (also exhibited) 

 that, when settled, the insects disappear entirely from view. 



Clerus formicarius wanted — Mr. H. St. J. Donisthorpb 



* This insect, although described by Moser as .h variety of D. polychron, 

 Thorns., is very distinct.— G. J. A. 



