1 86 THE HISTORY OF CREATION. 



of the class. In the first place, we may distinguish two 

 main divisions, namely. Flies with chewing mandibles 

 (Masticantia) and Flies with sucking mouths (Sugentia). 

 On a closer examination each of these two divisions may 

 again be divided into two sub-groups. Among chewing 

 Flies, or Masticantia, we may distinguish the biting and 

 the licking ones. Biting flies (Mordentia) comprise 

 the most ancient and primaeval winged Flies, the gauzy- 

 winged (Neuroptera), straight-winged (Orthoptera), and 

 beetles (Coleoptera). Licking flies (Lambentia) are re- 

 presented by the one order of skin- winged (Hymenoptera) 

 Flies. We distinguish two groups of Sucking Flies, or 

 Sugentia, namely, those which prick and those which sip. 

 There are two orders of pricking FHes (Pungentia), those 

 with half wings (Hemiptera) and gnats and blow-flies, 

 (Diptera) ; butterflies are the only sipping Flies (Sorbentia), 

 Lepidoptera. 



Biting Flies, and indeed the order of Primceval Flies 

 (Ai'chiptera, or Pseudoneuroptera) are nearest akin to 

 the still living Flies, and include the most ancient of 

 all Flies, the primary forms of the whole class (hence 

 also those of all Tracheata). Among them are, first of 

 all, the Ephemeral Flies (Ephemera) whose larvae which 

 live in water, in all probability still show us in their 

 trachese-gills the organs out of which the wings of Flies 

 were originally developed. This order further contains 

 the well known dragon-flies, or LibeUula, the wine-glass 

 sugar mites (Lepisma), the hopping Flies with bladder- 

 like feet (Physopoda), and the dreaded Termites, fossil 

 remains of which are found even in coal. The order 



