SUB-PHYLUM III 



INSKCTA 



880 



The family Twin ft //</ \Vl.it.- Ant- begini in tin- l.ia>, ami i- \v,-ll ivj.iv.-.-nt.-.| n , 

 the Tertiary, especially in arnl.rr, tin- Oligocene of I ami Mi...,i,, . 



]'!<;. 111'.'. 



Lithomuntis carbonaria, Woodward, 

 land. 2/ 3 (after Woodward ). 





Coal Measures ; Scot- 



si-. ( ili^ocf ne ; H:iltic amber. 

 /l (after Pictet). 



Oeningen, and Rodoboj. One unusually large species, Gigantotermes (Apochrysa) exceha, 

 Haase, appears as early as the Lithographic Slates of Bavaria, 



Psocidae (Book - lice), Embidae, and Perlidae sometimes occur in amber. 

 Ephemeridae (May Flies), whose precursors are found in Palaeozoic rocks, are 



'-""'-- ': -'-/ '. .:':."'-- 



Petalia //,,/;,,/,//,. Mun-i. .-]' 

 Lithographic ' Slates ; 

 B;iv;iri;i. - ;! . 



Colorado. 



Oligocene ; Florissant, 



preserved in the Lithographic Slates, in amber (Fig. 14.">o), and in certain Tertiary 

 deposits. 



Especial interest centres in the numerous and excvllrntly ]>i<->'i \ c.l remains of 

 Odonata (Dragon Flies) from the Lithographic Slates of Bavaria, such as Petalia 

 (Fig. 1451), Stenophlebia, Isophlebia, Aeschna, Anax, Heterophkbia, etc. The group 

 begins in the Lias, but is hardly so \vrll n-iuv^-nn-d in tin- 'JVrthry a> wonl<l U- 

 expected. Trichocnemis (Fig. 1452). Oligocene. 



