SUB-PHYLUM III INSECTA 685 
The family Termitidae (White Ants) begins in the Lias, and is well represented in 
the Tertiary, especially in amber, the Oligocene of Florissant, and Miocene of Rott, 


Fic. 1450. 
PIG 9. 3 
ES Cronicus anomalus, Pictet 
Lithomantis carbonaria, Woodward. Coal Measures ; Scot- sp. Oligocene ; Baltic amber. 
land. 2/3 (after Woodward). 3/5 (after Pictet). 
Oeningen, and Rodoboj. One unusually large species, Gigantotermes (Apochrysa) excelsa, 
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 
Fic. 1451. 
Petalia longialata, Munst. sp. 
Lithographic Slates; Solenhofen, 
Bavaria. 2/3. 
Fic. 1452. 
Trichocnemis aliena, Scudder. Oligocene ; Florissant, 
Colorado. 3/3. 
preserved in the Lithographic Slates, in amber (Fig. 1450), and in certain Tertiary 
deposits. 
Especial interest centres in the numerous and excellently preserved remains of 
Odonata (Dragon Flies) from the Lithographic Slates of Bavaria, such as Petalia 
(Fig. 1451), Stenophlebia, Isophlebia, Aeschna, Anax, Heterophlebia, etc. The group 
begins in the Lias, but is hardly so well represented in the Tertiary as would be 
expected. Trichocnemis (Fig. 1452). Oligocene. 
