30 THE IMMATURE STATE OF THE ODOXATA. 



;i.s lon^^ as tenth segment. Appendages a little shorter than segments nine 

 and ten, stout, sharp, hairj. Inferiors triangular, sharp ; middle appendage 

 as long as inferiors, sharp-pointed at tip; lateral superiors short, less than one 

 fourtli length of n^iddle 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 tlie collection, 17 mm., similar. 



The above determination is conjectural. There is no other described 

 species to which this nympha seems so likely to belong. 



BPI^SCHNA. 



Hagen Ms's. 



Body stout ; antennae six-jointed, sixth longest, pointed. Prothovax 

 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. EPI^SCHNA HEROS. 



Plate I. Fig. 3. 



^schna Heros. Fab. Ent. Pyst. Suppl. p. 285. 

 Hagen. Synopsis, N. Anier. Neur. p. 12S. 



Nympha, female, full-grown, alcoholic. Length, 50 mm.; 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 

 Avhich the lobe has indications of flicets, 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. Antennae 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 ; ^^olishcd liands 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, 



