V] SOME CRITICISMS 69 



from it in some particulars and are alike it in others. 

 There is a distinct famUy resemblance among the bulk 

 of the Dismorphias, including practically all the mimetic 

 forms, and on the whole the resemblances between 

 the imitative and the non-imitative forms are as 

 noteworthy as the differences. Though not exhibited 

 in so striking a fashion, the same is to a large extent 

 true of a large proportion of the cases of mimicry. 

 It is on the whole unusual to find cases where a single 

 species departs widely from the pattern scheme of 

 the other members of the genus and at the same time 

 resembles an imrelated species. Two of the best 

 instances are perhaps those of Limenitis archippus 

 (p. 49) and of the Pierid Pareronia (p. 23). Of 

 the total number of mimicry instances a high propor- 

 tion is supplied by relatively few groups. In each 

 region several main series of models and mimics run 

 as it were parallel to one another. In Asia, for example, 

 we have the PapUio-Danaine series where the colour- 

 patterns of a series of Danaines, all nearly related, 

 are closely paralleled by those of a section of the 

 genus Papilio, and by those of the Satyrid genus 

 Elymnicbs. In Africa there is a similar Papiho-Danaine 

 series though of less extent, Africa has a group of 

 models not found in Asia, and the Papilio-Danaine 

 series is as it were curtailed by the PapiUo-Planema 

 series with which to some extent runs parallel the genus 

 Pseudacraea. These phenomena of parallel series have 

 been mentioned here as shewing that mimicry tends 

 to run in certain groups and that in many cases at 



