38 SYNOPSIS OF SPECIES DESCRIBED. 
17. A. Constricta Say. (Raised.) 
Nymphe, full-grown, male and female. United States. 
Similar to Z. 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. Lateral spines on sixth to ninth segments; front border of mask with two small 
teeth; tip of middle appendage notched. 
18. Z@schna spec. 
Nymph 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. #@schna spec. 
Nymphe, full-grown, male and female. Brazil. 
Stout, shape of E. grandis; processes prominent, 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.) 
Nymphs, full-grown, male and female, Europe. 
Processes slightly separated, sharp, the posterior half length of the anterior; lateral spines 
on sixth to ninth segments. 
Gompheschna 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. G. Furcillata Say. (Supposition.) 
Nymphe, male and female, nearly full-grown. United States. 
Characters of genus; processes conical, sharp, posterior shorter, enclosing less than right 
angle. 
Neureschna Selys. 
Similar to Gompheschna ; lateral spines on segments four to nine; appendages long, the 
middle one as long as the inferiors; all sharply pointed. 
