30 THE IMMATURE STATE OF THE ODONATA. 
as long as tenth segment. Appendages a little shorter than segments nine 
and ten, stout, sharp, hairy. Inferiors triangular, sharp ; middle appendage 
as long as inferiors, sharp-pointed at tip; lateral superiors short, less than one 
fourth length of middle one, blunt. Male projection as long as laterals, 
triangular, rounded at tip; female valve half length of ninth segment, hairy 
at edges, There is a young specimen in the collection, 17 mm., similar. 
The above determination is conjectural. There is no other described 
species to which this nympha seems so likely to belong. 
EPIASCHNA. 
Hagen Ms’s. 
Body stout; antenne six-jointed, sixth longest, pointed. Prothorax 
bluntly pointed at outside angles. Legs short in proportion. Abdomen 
large and broad. Segments four to nine have lateral spines; inferior and 
middle appendages of equal length. 
23. EPIZSCHNA HEROS. 
Puate [. Fie. 3. 
fschna Heros. Fab. Ent. Pyst. Suppl. p. 285. 
Hagen. Synopsis, N. Amer. Neur.  p. 128. 
Nympha, female, full-grown, alcoholic. Length, 50mm.; breadth, 12 mm, 
Locality unknown; Portland, Me., raised by Mr. Jones. Coll. Comp. Zool. 
Stout, head large, rather convex, slopes rather abruptly at sides. Eyes 
rather small in proportion, prominent, egg-shaped, prolonged obliquely at 
inner angles in a lobe which is divided by a linear impression, in front of 
which the lobe has indications of facets, behind rough and like occiput, 
except just along border of occiput, where it is obscurely facetted. Vertex 
rather above the level of the eyes; indications of ocelli on posterior por- 
tion; anterior semicircular, small. Antenne six-jointed, small ; third longer 
than fourth, somewhat shorter than the two basals; sixth longer than fourth 
and fifth together, pointed. Occiput longer than fore part of head, rough- 
ened by small black tubercles; sides oblique, rounded at hind angles; rather 
deeply notched behind ; polished bands on hind angles. Mask extending to 
middle legs, enlarged at apical half rather abruptly, and rounded at sides; 
middle third of foreborder not much produced, cleft rather shallow, on each 
side of cleft a small tooth. Palpus meeting opposite one, cut straight at end, 
