02 



SYNOPTIC TABLE OF THE STIRPES OF THE FIRST 



ANALOGY, 

 to the class of Ametabola, Macleay. 



ANOPLURA. 



Stirps V. 

 ANOPLURIFORM. 



METAMORPHOSIS. 



Larva, with a head of excessive size attached to 

 the body by a long neck, abruptly terminated 

 behind and entirely deprived of a caudal ap- 

 pendage. (In some of the Erycince the head 

 of the larva has two erect spinous appendages 

 resembling those of theThysanuriform stirps.) 



Pupa, concealed by afolliculus, or by the covering 

 of a convoluted leaf, resembling that of some of 

 the nocturnal Lepidoptera. 



Pedicultjs. 



NlRMUS. 



Cecrofs. 



Caligus. 



This genus leads to Entomoda among the 

 Epizoarice, with which we commence the circle 

 of Ametabola. (See above, p. 58.) 



In explanation of the second column of this table, which is intended to illustrate the analogies of the larva of the first tribe of Lepidoptera, I refer the reader 

 to pa"e 286 and to pages 350 and 351 of the Hora Entomologies. Mr. Macleay here traces the Ametabola from the Chilognatha to the Vermes ; hence to the 

 Anoplura- further to the Thysanura and to the Chilopoda, whence he returns to the Chilognatha and completes the circle. He therefore pm-sues a circular 

 course in a direction opposite to that of our table, but the succession of affinities is the same although here reversed. He commences with the Chilognatha ; from 

 these he proceeds to the most imperfect Annulose animals, with the following observation (p. 351). " Articulation is not very distinct in some of the Epizoaria 

 of Lamarck, but sufficiently so to lead us to the Caligi of Muller and the genus Cecrops of Dr. Leach." (This genus, although generally arranged among the 

 Crustacea, is placed by Mr. Macleay in the class o£ Ametabola; Lamarck had indeed already expressed a doubt as to its really being crustaceous.) " The genus 

 Cecrops by its general form, antenna;, structure of the feet, and want of posterior appendages, prepares us for the Anoplura. These we quit for the genus 

 Smynthirm of Latreille, and by means of it enter among the Thysanura. Some of these, such as the Lepismcr of Latreille, have an elongate form, long setil'orm 

 antenna;, various small appendages on each side representing false feet, together with articulated seta; terminating the posterior part of the body." " Thus," 

 continues Mr. Macleay, " we come to the larva state of the Chilopoda, or Scohpcndra of Linmeus, from which, bearing in recollection the form and structure 

 of the genus Craspedosoma of Leach, we return to the Chilognatha and complete the circle of Ametabola." 



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