SOME SCH'TH INDIAN INSECTS, ETC. 



[CHAP. II. 



[nsects seem to have flourished exceedingly and many 

 of the fossils found in these rocks are referable to genera still in 



'ICC. 



The scheme ot ol the modern groups of Insects is in- 



dicated roughly in figure 14, but the limitations of an area containing 

 wo dimensions oi length and breadth render it impossible 

 to give a true idea, which will be grasped bettet bj imagining the 



different stems to be branches emitting twigs and growing at 

 different angles and at various heights from the paper, in some 

 ing together and in others separating widely. It 

 must, ot course, be remembered also, in speaking of more recent or 

 more ancient forms, that all existing groups of [nsects are equally 

 far removed in point of time from the archaic members of tin- Class, 

 and that all that is meant is that some groups have adapted them- 

 selves better than others to special conditions. 



A glance at figure 14 will show the impossibility of exhibiting 

 the natural relationships of the various groups in any linear method 

 of arrangement. 



There are, roughly speaking, two commonly accepted methods 

 01 the classification ol insects, one system making use of about nine 

 principal Orders, the other of about thirty. Roth systems have 

 their good points and their bad. but a system admitting many 

 Ord ■ to exhibit in truei perspective the real relationships 



of its components. The following list exhibits the various group.-, 

 adopted in this book, arranged in order, commencing with the more 

 specialized ami concluding with the mote generalized Orders: - 



I 'r.k-rs in which the groups in 

 column I would b( placed Remarks. 



Groups adopted in this 



in the Nin 



1. Hymenoptera 



2. O 



3. Strepsiptera 



1. I 'i 



5. Siphonaptera 



6 . I i 1 1 1 1 1 1 1 p 



7. I 1 

 S. N 

 ... Pa 



10. Psm 



11. Mallophaga 

 1 2. Bphemerida 

 1 ',. Plecoptera 

 14. Odonata 



1 1 5 menoptera 

 Coleopfi 1 a 



Diptera 

 Lepii I' iptera 



Ni uroptera (pari 





1 



Insects with distinct 



i imorphosis an. I 



with quiescent pupa 



structurally distinct 



from the lai 1 a. 



with little meta- 

 morphosis and no 



definite pupal - 



J 



f>l in Aleurodidse and Coccidce, two families of Rhyochota, in which a quiescent 

 pupal 1 



