1 86 



ANNULOSA. 



must have attained a size much larger than that of any recent 

 Ephemerids, measuring fully seven inches in expanse of wing. 



Fig. 129. Haplophlebium Bantesii (after Dawson). From the Carboniferous Rocks 

 of Canada, a Profile of base of wing. 



Another remarkable Carboniferous insect is the Archimulacris 

 Acadicus of Mr Scudder (fig. 130). It belongs to a group of 

 Insects which are tolerably abundant in 

 Carboniferous strata viz., the Cockroaches; 

 but it does not agree with any living forms. 

 In the Secondary period, remains of In- 

 sects are much more abundant than in any 

 Palaeozoic deposit The Jurassic Rocks 

 have yielded the earliest examples of the 

 orders Hymenoptera and Hemiptera, whilst 

 the orders Neuroptera, Orthoptera, and 

 Coleoptera are well represented. In the 

 Tertiary Rocks, again, the remains of In- 

 sects become still more abundant, and in 

 some deposits they are found in the greatest 

 profusion. Whilst all the above-mentioned orders are repre- 

 sented, the Tertiary Rocks have also yielded the first traces 

 (with doubtful exceptions) of the orders Diptera zxi&Lepidoptera. 

 Amber, which is, geologically speaking, a very modern pro- 

 duct, has yielded the remains of a vast number of insects, all 

 of which belong to extinct forms. 



The following are the names of the Orders of Insects which 

 are known in a fossil condition, with the date of their first 

 appearance : 



Fig. 1 30. A rchimnl- 

 acris Acadicus (after 

 Dawson). From the 

 Carboniferous Rocks of 

 Canada. 



