SYNOPSIS OF SPECIES DESCRIBED. 37 



aoiite angle, triangular, sharp, the anterior half length of the posterior; lateral appendages only- 

 one fourth shorter than inidiUe one. 



10. ,33. Grandis Linn. (Raised.) 



Nyniph.TP, full-grown, male and female. Eurojie, 



Hind angles of head more oblique ; mask similar to JE. rufescens ; processes longer, more 

 separated, of equal length, sharp, bent a little outwards, the anterior rather slender ; lateral 

 appendages about half the length of the middle one. 



11. .ffi. Cyanea Muell. (Raised.) 



Njmph.T, full-grown, male and female. Europe. 



Hind angles of he.ad olilique ; basal half of mask, narrower ; processes short, about of 

 equal length, enclosing a right angle ; posterior larger, rounded in sides ; lateral appendages 

 half length of middle one. 



12. ,33. Juncea Linn. (Raised.) 



Nymphre, full-grown, male and fem.ale. Europe. 



Similar to JE. cyanea ; anterior process half length of posterior, much smaller, 



13. JE. Viridis Eversm, (Raised.) 



Nyinphse, full-grown, male and female. Europe. 



Similar to JE. rufescens ; hind angles of head more oblique ; processes of equal length, 

 sharp tips a little bent outwards, enclosing right angle; lateral ajjpendages half length of 

 middle one. 



14. JE. Mixta Latr. (Raised.) 



Nymphfe, full-grown, male and female. Europe. 



Similar to M. cyanea ; hind angles of head rounded ; mask gradually enlarged at apical 

 third; processes blunt, stout, equal in length, anterior narrower; not much separated; lateral 

 appendages about half length of middle one. 



15. ^. Affinis Vander Lind. (Raised.) 



Nympha, full-grown, male. Europe. 



Similar to JE. mixta, more slender ; processes blunt, very slightlj' separated, of equal 

 length and size ; lateral appendages shorter. 



B. Lateral sinnes on fifth in ninth segments ; no teeth on front border of mask ; lateral 

 appendages shorter than the inferiors ; middle one notched at tip. 



16. .33. Eremitica Scudder. (Supposition.) 



Nymphsp, full-growai, male and female. Arctic America and New Hampshire. 



Similar to JE. rufescens ; hind angles of head oblique ; processes long, equal, sharp, tips 

 bent a little outwards, enclosing less than right angle ; lateral appendages two thirds length 

 of middle one ; female valves not quite reaching tip of segment. 



