24 THE IMMATURE STATE OF THE ODONATA. 



granulated. Appendages longer than two last segments ; sharp, middle one 

 a little shorter than inferiors, deeply notched ; lateral superiors cylindrical, 

 sharp, nearly two thirds as long as middle one. Female valve not quite 

 reaching end of segment nine. Male projection conical, rather sharp, a 

 little shorter than lateral superiors. The two male specimens are not fully 

 developed in these parts, being only 30 and 33 mm. long. A fall-grown fe- 

 male specimen from Minnesota, 47 mm. long, belongs apparently to this 

 species. The determination seems to be justified, as Mr. Sanborn found 

 nympha3 and imago at the same place. Hermit Lake, in middle of July. 



17. ^SCHNA CONSTRICTA. 



Plate III. Fig. 1. 

 Say. Hagen, Synopsis N. American Neur, p. 123. 



Nymphoe, two full-grown, in alcohol. Length, 41mm.; breadth, 7 mm. 

 Locality, Shooley's Mountain, Pa. ; Boston, Mass., raised hy Mr. S. Henshaw. 

 Coll. Mus. Conip. Zool. 



Similar to JE. eremita. Longer and more slender in proportion. Head 

 very similar. Mask narrower at base, more abruptly enlarged at apical 

 third. Palpus finely denticulated, tip cut straight. Processes similar to 

 JE. eremitica, not so long nor so sharp, the anterior less bent, the posterior a 

 little larger. Legs similar in shape, shorter in proportion ; hind legs not 

 reaching segment eight. Granulation on abdomen very fine. Lateral spines 

 on segments six to nine, an indication on fifth. Ninth segment half length 

 of tenth. Inferior appendages as long as two last segments, very sharp ; 

 middle one not so long as inferiors ; deeply notched ; lateral superiors 

 more than half length of middle one, cylindrical and abruptly sharpened. 

 Male projection conical, somewhat shorter than lateral superiors, sharp. 

 Hairs among granulation, small, yellowish. 



Two full-grown female nympha?, one fi-om Maryland, the other without 

 locality, and a small male seem to belong to tliis species. Male, in alcoliol, 

 from Lake Champlain, is sufficiently like to be placed in this species. Some- 

 what less slender, darker in color ; two black rings on femora and tibiaa and 

 on end of tarsal joints. 



A very small nympha from Bethel, Me., and some younger ones from 

 Cambridge, Mass., are colored in the same manner. Abdomen in many 

 specimens dark, varied with short linear spaces of paler color and with large 



