336 INSECTA 



Una oolitica from the Stonesfield Slate. The Order is 

 better represented, although still uncommon, in the Ter- 

 tiary Beds ; examples have been found in the Oligocene of 

 the Isle of Wight, the Oligocene amber of the Baltic, and 

 in the Miocene of Colorado. 



ORDER V. COLEOPTERA. 



The Coleoptera (beetles) first appear in the Trias; 

 they are more numerous in the Jurassic, and are well 

 represented in some of the Tertiary Beds. Examples 

 have been found in the Lias, the Stonesfield Slate, the 

 Solenhofen Limestone, the Purbeck Beds, the Lower 

 Chalk of Bohemia, the Oligocene amber, and in the 

 Miocene of Oeningen and Colorado. 



ORDER VI. HEMIPTERA 



Insects allied to the Hemiptera are found in the 

 Upper Palaeozoic rocks. Forms which can be definitely 

 assigned to this Order appear in the Lias. Examples of 

 the Aphidas (plant-lice) occur in the Oligocene and 

 Miocene. Fulgoridse are found in the Lias, the Purbeck 

 Beds, and in the Tertiary. Notonectidse (water-bugs) 

 appear in the Upper Jurassic rocks, and are also found in 

 the Oligocene and Miocene. 



ORDER VII. DIPTERA 



The Diptera include flies, fleas, gnats, and mosquitoes. 

 A few forms are found in the Lias, the Solenhofen Lime- 

 stone, and the Purbeck Beds ; the Order is represented 

 by numerous forms in the Oligocene amber. 



