( iv ) 



the black body is moi^e or less clearly seen ; another pale 

 yellow with black transverse bars. The first of these groups 

 is composed of Lygfeid and Reduviid species, the second of 

 Pyrrhocorid and Eeduviid. To return to the Aculeate-centred 

 groups, the Mutillidx are resembled by Carahids and 

 CicindeUdse, and yet there is also a secondary resemblance 

 between these two latter, which becomes primary in the case 

 of species which do not resemble the Mutillida>. In other 

 cases small slender Carabidm of the genus Atractonota primarily 

 resemble ants in movement and appearance, and yet secondarily 

 resemble other species of Carabidx in the markings by which 

 these latter resemble the Mutillidx. These complex inter- 

 relationships suggest proto-, deutero-, and perhaps trito- 

 synaposematic resemblaxices for the Mullerian associations, 

 proto-, deutero-, and perhaps, tritopseudaposematic resem- 

 blances for the Batesian. 



Another important group has for its centre three species 

 of ants, resembled by a Pyrrhocorid bug of a new genus, 

 Megapetus, described by Mr. Distant in the Appendix, and a 

 little Locustid of the genus Myrmeco-plmna, with the parts of 

 the body which would interfere with the likeness to an ant 

 obliterated, upon the plant on which the insect occurs, by 

 their green colour. Examples of all these were taken on one 

 plant in a single day. 



Nearly all groups here shortly described were illustrated by 

 photographs projected on the screen. A brief account of 

 some of the chief results of Mr. Marshall's work was read 

 before Section D of the British Association at Bradford (1900), 

 and published in abstract in The Report (p. 793). 



The number of new facts is so large, the experiments so 

 numerous and complete, and the range of observation ex- 

 tended over so many orders in addition to the usually-studied 

 Lepidoptera, that this memoir places South Africa in the 

 first rank as the country from which the chief evidence in 

 support of existing theories of Mimicry, Warning Colours, etc., 

 has been supplied, 



A discussion ensued in which Mr. F. Merrifield, Dr. F. A. 

 Dixey, Prof. Hudson Beare, Colonel Yerbury, Mr. J. W, Tutt, 

 and Prof. Poulton took part. 



