FEBRUARY. 31 



short ; body robust ; mandibles strong and toothed ; 

 size small. 



ORDER VI. NEUBOPTERA, Linnaus. 



Characters. Wings four, generally large, and of equal size, 

 membranaceous ; mouth with transversely moveable jaws ; body 

 not armed with a sting. 



1. Psocidtz. Posterior wings small ; antennae slender, long 



and setaceous ; labial palpi almost obsolete ; mandibles 

 horny and toothed ; maxillae elongated ; body short and 

 ovate ; wings deflexed, with conspicuous veins, often 

 coloured ; legs long and slender ; tarsi two- or three- 

 jointed; size minute. Localities, trunk of trees, pal- 

 ings, old walls, books, etc. 



2. Perlidtf. Posterior wings large ; antennae nearly as long 



as the body ; labial palpi developed ; mandibles rucli- 

 mental ; body oblong and depressed ; head flat ; tarsi 

 three-jointed ; size moderate. 



3. Ephemerida. Wings, hinder pair very small; antennae 



small ; mouth almost obsolete ; body long and slender, 

 with elongated setae at the extremity ; head small ; 

 clypeus sometimes large, and closing over the mouth ; 

 legs slender ; tarsi five-jointed ; size small. Locality, 

 near water. 



