ANT AND TERMITE GUESTS 189 



to their hosts, to whom they present themselves also as 

 their equals ; these belong to the Mimicry type which, 

 especially in many of the associated beetles (Staphy- 

 linidse) of the wandering ant of the Old and New World, 

 show an astonishingly high perfection. Other guests, 

 finally, clothe themselves in armour impenetrable by 

 the ant beetles, in order thus to be able to live in their 

 company ; these form the offensive (Trutz) type of the 

 Ant and Termite guests, etc. 1 The relation of the said 

 facts to the theory of evolution is briefly stated as 

 follows, abstaining from discussing the causes (internal 

 and external) of the evolution and also the manner 

 of it (fluctuating variation, mutation, etc.). 



The myrmecophil and termitophil adaptive charac- 

 ters with which we meet in various classes of insects 

 millipedes, spiders, crustaceans, and in the various 

 organs of these classes, especially, however, in the insect 

 orders of the Beetles and Diptera convert the forms 

 concerned into proper systematic species, proper genera, 

 and often even into proper sub-families or families 

 which differ widely from their systematic relatives 

 which do not associate with Ants or Termites. 



These differences, however, are only to be explained 

 by assuming that in the course of race development by 



1 For more details see Wasmann : Die Myrmekophilen und Termito- 

 philen, Ley den, 1895 (Verh. des dritten Internationalen Zoologencongr esses) ; 

 Die moderne Biologie und die Entwicklungstheorie (1906), chap. x. ; Der 

 Kampf umdas Entwicklungsproblem in Berlin (1907). 1 Vortrag ; Beispiele 

 rezenten Artenbildung bei Ameisengdsten und Termitengasten (Festschrift far 

 .Rosenthal Biolog. Zentralblatt, XXVI (1906), Nos. 17 and 18 ; Die progressive 

 Artbildung und die Dinardaformen (Natur und Offenbarung (1909), part 6) ; 

 Wesen und Ursprung der Symphilie (Biolog. ZentralbL, XXX (1910), 

 Nos. 3-5). 



