38 SYNOPSIS OF SPECIES DESCRIBED. 



17. JSj. Constricta Say. (Eaised.) 



Nymphse, full-grown, male and female. United States. 



Similar to ^. eremitica, more slender ; apical half of mask less enlarged ; processes sim- 

 ilar, less sharp, the anterior less bent outwards, the posterior a little larger ; lateral spine of 

 segment fifth generally only indicated ; lateral appendages longer than half the middle one. 



C. Lateml sjiines on sixth to ninth segments ; front harder of mask with two small 

 teeth ; tip of middle appendacje notched. 



18. .Sschna spec. 



Nymphw full-grown, male and female. Himalaya. 



Similar to Anax, very long ; processes blunt, posterior more prominent, enclosing obtuse 

 angle ; lateral appendages half length of middle one, abruptly pointed. 



19. .Sischna spec. 



Nymphse, full-grown, male and female. Brazil. 



Stout, shape of ^E. grandis ; processes jirominont, sharp, the posterior longer, bent out- 

 wards ; enclosing right angle ; lateral appendages very sharp, length of the inferiors. 



Brachytron Evans. 



Body long, slender ; head smaller, rather convex above, much narrower behind ; front 

 border of mask produced in oblique angle, cleft ; legs shorter ; abdomen long, narrow ; appen- 

 dages short, middle one a little shorter than inferiors, cut at tip ; laterals shorter ; male projec- 

 tion conical ; female valves not reaching tip of segment. 



* 



20. B. Pratense Mueller. (Raised.) 



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



Processes slightly separated, sharp, the posterior half length of the anterior ; lateral spines 

 on sixth to ninth segments. 



, Gomphceschiia Selys. 



Body long, slender ; eyes small ; lateral spines on segments five to nine ; middle appen- 

 dage a little shorter than the inferiors, bifid at tip. 



21. Gr. Furcillata Say. (Supposition.) 



N3'mpha>, male and female, nearly full-grown. United States. 



Characters of genus ; processes conical, sharp, posterior shorter, enclosing less than right 

 angle. 



Neuraeschna Selys. 



Similar to Gomphoeschna ; lateral sj^ines on segments four to nine ; appendages long, the 

 middle one as long as the inferiors ; all sharply pointed. 



